Programmable Frequency Counter

94
Programmable Frequency Counter PM6685 & PM6685R Service Manual

Transcript of Programmable Frequency Counter

Page 1: Programmable Frequency Counter

ProgrammableFrequency CounterPM6685 & PM6685R

Service Manual

Page 2: Programmable Frequency Counter

4822 872 20106

First Edition (May 2003)

No part of this manual may be copied without the express permission of the copyright owner.

All product names are trademarks of their respective companies.

2003 Pendulum Instruments AB

All rights reserved. Printed in Sweden.

This is a complementary service manual covering instruments with manufacturing numbers exceeding 840684. The principaldifferences are to be found in Chapter 7 and in Chapter 8 due to a major redesign of the main PCB.

Do not dispose of the previous edition, identified by the part number, 4822 872 25012, and the publishing date, June 1996.

You may have to refer to it for information on older instruments as well as options not mentioned here.

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Contents

1 Safety Instructions

2 Performance Check

General Information . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Recommended Test Equipment . . . . . . . . . . . . . . . . 2-2

Front Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Short Form Specification Test . . . . . . . . . . . . . . . . . . 2-3

Rear Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Measuring Functions . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

3 Disassembly

Removing the Cover . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Reinstalling the Cover . . . . . . . . . . . . . . . . . . . . . . . . 3-2

PM9624 (HF Input) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

PM9626B (GPIB Interface) . . . . . . . . . . . . . . . . . . . . 3-3

PM9691 or PM9692 (Oven Oscillator) . . . . . . . . . . . 3-3

4 Circuit Descriptions

Block Diagram Description . . . . . . . . . . . . . . . . . . . . 4-2

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Hardware Functional Description . . . . . . . . . . . . . . . 4-4

Front Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Main Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Rear Panel Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13

Optional Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

Software Functional Description . . . . . . . . . . . . . . 4-15

Test Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

5 Repair

Preventive Maintenance. . . . . . . . . . . . . . . . . . . . . . . 5-2

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

When to Replace the Fan

(PM6685R only ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Safety Inspection and Test After Repair . . . . . . . . . 5-9

General Directives. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

6 Calibration Adjustments

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Input Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Reference Oscillators . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Other Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6

7 Replacement Parts

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Mechanical Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

Main Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6

Front Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12

GPIB Interface (PM9626B) . . . . . . . . . . . . . . . . . . . 7-13

8 Drawings & Diagrams

How to read the diagrams. . . . . . . . . . . . . . . . . . . . . 8-2

9 Appendix

How to Replace Surface Mounted Devices. . . . . . . . 9-2

Electrostatic discharge . . . . . . . . . . . . . . . . . . . . . . . 9-3

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4

Power Supply Switchmode Module . . . . . . . . . . . . . 9-5

Circuit Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-6

Calibration Adjustments . . . . . . . . . . . . . . . . . . . . . . 9-7

Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . 9-8

PM6685R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12

Performance Check . . . . . . . . . . . . . . . . . . . . . . . . 9-12

Functional Description. . . . . . . . . . . . . . . . . . . . . . . 9-12

Calibration Adjustments . . . . . . . . . . . . . . . . . . . . . 9-13

Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . 9-14

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Chapter 1

Safety Instructions

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WARNING: These servicing instructions are for use

by qualified personnel only. To reduce the risk of

electric shock, do not perform any servicing other

than that specified in the Operating Manual unless

you are fully qualified to do so.

Authorized service and calibration of this instrument is available

through your Fluke representative. See address at the end of this

manual.

Read this chapter carefully before you check, adjust, or repair an in-

strument.

Caution and Warning Statements

You will find specific warning and caution statements where neces-

sary throughout the manual.

CAUTION: Indicates where incorrect operating proce-dures can cause damage to, or destruction of,

equipment or other property.

WARNING: Indicates a potential danger that requires

correct procedures or practices in order to prevent

personal injury.

This Timer/Counter has been designed and tested in accordance with

safety class 1 requirements for Electronic Measuring Apparatus of

IEC (CENELEC) publication EN61010-1, and CSA 22.2

No. 1010-1, and has been supplied in a safe condition.

This manual contains information and warnings that should be fol-

lowed by the user and the service technician to ensure safe operation

and repair in order to keep the instrument in a safe condition.

WARNING: Opening instrument covers or removing

parts, except those to which access can be gained

by hand, is likely to expose high voltages which

can cause death.

The instrument must be disconnected from all voltage sources before

it is opened. Remember that the capacitors inside the instrument re-

tain their charge even if the instrument has been disconnected from

all voltage sources.

Grounding

This instrument is connected to ground via a sealed three-core power

cable, which must be plugged into socket outlets with protective

ground contacts. No other method of grounding is permitted for this

instrument.

The ground symbol on the rear panel indicates where the

protective ground lead is connected inside the instrument.

Never remove or loosen this screw.

When the instrument is brought from a cold to a warm environment,

condensation may cause hazardous conditions. Therefore, ensure

that the grounding requirements are strictly met.

Power extension cables must always have a protective ground con-

ductor.

Indicates that the operator should consult the manual.

WARNING: Any interruption of the protective ground

conductor inside or outside the instrument, or dis-connection of the protec- tive ground terminal, is

likely to make the instrument dangerous. Do not in-

tentionally disrupt the protective grounding.

Disposal of Hazardous Materials

WARNING: Disposal of lithium batteries requires spe-

cial attention. Do not expose the batteries to heat

or put them under extensive pressure. These mea-

sures may cause the batteries to explode.

A lithium battery is used to power the nonvolatile RAM in this in-

strument. Our world suffers from pollution, so don’t throw batteries

into your wastebasket. Return used batteries to your supplier or to the

Fluke representative in your country.

Line Voltage

The instrument can be powered by any voltage between 90 and

265 VAC without range switching. This makes it suitable for all nom-

inal line voltages between 100 and 240 V.

Replacing Components in Primary Circuits

Components that are important for the safety of this instrument may

only be replaced by components obtained from your local Fluke

representative. After exchange of the primary circuits, perform the

safety inspection and tests, as described in Chapter 5, “Repair”.

Fuses

This instrument is protected by an ordinary 1.6 A slow blow fuse

mounted inside the instrument. NEVER replace this fuse without

first examining the Power Supply Unit.

1-2 Safety Instructions,

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Chapter 2

Performance Check

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General Information

WARNING: Before turning on the instrument, ensure

that it has been installed in accordance with the In-

stallation Instructions outlined in Chapter 3 of the

Operators Manual.

This performance procedure is intended to:

– Check the instrument’s specification.

– Be used for incoming inspection to determine the acceptability

of newly purchased instruments and recently recalibrated in-

struments.

– Check the necessity of recalibration after the specified

recalibration intervals.

NOTE: The procedure does not check every facet of the in-strument’s calibration; rather, it is concerned primarily

with those parts of the instrument which are essential

for determining the function of the instrument.

It is not necessary to remove the cover of the instrument to perform

this procedure.

If the test is started less than 20 minutes after turning on the instru-

ment, results may be out of specification, due to insufficient

warm-up time.

Recommended TestEquipment

*) Two of the cables must have 10 ns difference in delay, for ex-

ample: 5 ns and 15 ns.

Preparations

Power up your instruments at least 20 minutes be-fore beginning the tests to let them reach normal

operating temperature. Failure to do so may result

in certain test steps not meeting equipment specifi-cations.

Front Panel Controls

Power-On Test

At power-on the counter performs an automatic self-test of the fol-

lowing:

– Microprocessor

– RAM

– ROM

– Measuring circuits

– Display

If a GPIB interface is installed, the GPIB address is displayed.

If there are any test failures, an error message is shown.

– Turn on the counter and check that all segments light up on the

display and that no error message appears.

Internal Self-Tests

The different built-in test routines invoked by the power-on test can

also be activated from the front panel as follows:

– Enter the Auxiliary Menu by pressing AUX MENU.

– Select the test submenu by pressing DATA ENTRY up or

down.

– Enter the test menu by pressing the ENTER key.

Selections for internal self-tests are:

1 TEST ALL (Test 2 to 5 in sequence)

2 TEST RO (ROM)

3 TEST RA (RAM)

4 TEST LOGIC (Measuring Logic)

5 TEST DISP (Display Test)

– Use DATA ENTRY up/down to select TEST ALL, then press

ENTER.

– If any fault is detected, an error message appears on the dis-

play and the program halts.

– If no faults are detected, the program returns to measuring

mode.

2-2 Performance Check, General Information

Type of instru-

ment

Required

Specifications

Suggested

Equipment

LF Synthesizer Square;

Sine up to 10 MHz

Power Splitter 50 PM9584/02

T-piece

Termination 50 PM9585

Reference oscilla-tor

10 MHz ±0.1 Hz forstandard oscillator

Fluke counter withcalibrated option

PM9691

10 MHz ±0.01 Hz for

PM9691 & PM9692

Fluke PM6685R or

PM6681R

10 MHz ±0.0001 Hz

for PM6685R

Fluke 910R or Ce-

sium Standard

HF signal genera-

tor

0.5 GHz (no presc.)

3.3 GHz (option 10)

Pulse Generator 125 MHz

Oscilloscope with

probes

350 MHz

BNC cables 5 to 7 cables *

Table 2-1 Recommended Test Equipment.

Ω

Fig. 2-1 Text on the display.

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Keyboard Test

The keyboard test verifies that the counter responds when you press

any key. To check the function behind the keys, see the tests further

on in this chapter.

Press the keys as described in the left column and look on the display

for the text, as described in the second column. Some keys change

more text on the display than described here. The display text men-tioned here is the text mainly associated with the selected key.

NOTE: For the instrument to respond correctly, this test must

be carried out in sequence and you must start with the

preset (power-on) setting.

* The LSD may vary.

** MENU is not disabled by setting DEFAULT; press menu again.

Short Form SpecificationTest

Sensitivity and Frequency Range

– Press the PRESET key to set the counter in the default setting.

Then confirm by pressing ENTER.

– Turn off AUTO.

– Select IMP A = 50 and maximum sensitivity.

– Connect a signal from a HF generator to a BNC power splitter.

– Connect the power splitter to your counter and an oscilloscope.

– Set input impedance to 50 on the oscilloscope.

– Adjust the amplitude according to the following table. Read

the level on the oscilloscope. The counter should display the

correct frequency.

Reference Oscillators

X-tal oscillators are affected by a number of external conditions,

such as ambient temperature and supply voltage, but they are also af-

fected by aging. Therefore, it is hard to give limits for the allowed

frequency deviation. You must decide the limits depending on your

application, and recalibrate the oscillator accordingly. See the Pre-

ventive Maintenance in the Repair chapter, Chapter 5.

To check the accuracy of the oscillator you must have a calibrated

reference signal that is at least five times as stable as the oscillator

that you are testing, see the following table.

– Press the PRESET key, then press the ENTER key to set your

counter in the Default setting.

Performance Check, Short Form Specification Test 2-3

Key(s) Display Note Pass

/Fail

STAND-BY Display Off Red LEDbeside

the key

On

ON Backlight on

PRESET

ENTER

DEFAULT?

NO SIGNAL

Default

setting

EXT REF EXT REF

Input A

FILTER FILTER

50 50

(2 times)

SENS

(2 times)

Bar graph:

SENS

(2 times)

Bar graph:

AUTO AUTO TRIG

Other

PRESET

ENTER

DEFAULT?NO SIGNAL

Defaultsetting

MEAS TIME 200–3

s

DATA ENTRY 500–3

s

DATA ENTRY 200–3

s

ENTER NO SIGNAL

DISPLAY HOLD HOLD

DISPLAY HOLD

SINGLE SINGLE

FUNCTION DUTY F A

FUNCTION TOT A MAN

FUNCTION DUTY F A

FUNCTION FREQ A

AUX MENU RECALL

MEAS RESTART NO SIGNAL

PRESET

ENTER

DEFAULT?

NO SIGNAL

Default

setting

CHECK 10.000000006Hz* Start

counting

NULL NULL

NULL 10.000000006Hz*

BLANK DIGITS

(3 times)

10.00000 6Hz*

MENU Displays all avail-able functions, pro-

cesses and input

controls. Selecteditems are blinking.

Table 2-2 Keyboard Test.

Frequency Level Pass/Fail

MHz mVPP mVRMS dBm Input A

1 30 10 –27

25 30 10 –27

50 30 10 –27

150 60 20 –21

200 90 30 –17

250 150 50 -13

300 150 50 -13

Table 2-3 Sensitivity of input A at various frequencies.

Oscillator Max. tempera-

ture dependence

Max. aging

per month

Max. aging

per year

Standard ±100 Hz ±5 Hz ±50 Hz

PM9691 ±0.05 Hz ±0.1 Hz ±0.75 Hz

PM9692 ±0.025 Hz ±0.03 Hz ±0.2

Rubidium ±0.003 Hz ±0.0005 Hz ±0.002 Hz

Table 2-4 Deviation (for PM9691 and PM9692 after a

warm-up period of 48 hours).

Page 10: Programmable Frequency Counter

– Connect the reference to input A.

– Check the readout against the accuracy requirements of your

application.

Acceptance Test

As an acceptance test, the following table gives a worst case figure

after a 30 minute warm up time. All deviations that can occur in a

year are added together.

Acceptance Test, PM6685R

To fully test the accuracy of the PM6685R, a reference signal of ex-

tremely high stability is needed. Examples of such references are

Cesium Atomic references, or transmitted signals from a nationally

or internationally traceable source, like the GPS satellites.

Recommended Test Equipment

Type Stability Model

10 MHz refer-

ence

1x10-10

910R with satellite contact dur-

ing the last 72 hours.

Test Procedure

– Connect the counter to the line power.

– Check that the UNLOCK indicator turns on, and then turns off

again within 6 minutes after connecting line power.

– Connect the 10 MHz reference signal to input A of the counter.

– Select FREQUENCY A measurement.

– Select 2 s measuring time.

– Check that the displayed frequency is 10.00000000 MHz

±0.05 Hz 10 minutes after connection to line power.

Rear Input/Output

INT REF Output

– Connect an oscilloscope to the 10 MHz output on the rear of

the counter. Use coaxial cable and 50 termination.

– The output voltage is sinusoidal and should be above 2.8 VPP.

EXT REF Input

– Press the PRESET key, then press the ENTER key to set your

counter in the Default setting.

– Apply 10 MHz sine to input A equipped with a T-piece and to

Ext Ref input at the rear, terminated with 50 . Amplitude on

10 MHz signal; 200 mVRMS, (560 mVPP)

– Press the Ext Ref key.

– The display should show 10.000000006 Hz ± 5 LSD.

EXT ARM INPUT

– Press the PRESET key, then press the ENTER key to set your

counter in the Default setting.

– Select 50 input impedance.

– Apply 10 MHz 500 mVRMS, (1.4 VPP) sine to input A

– The counter measures and displays 10 MHz.

– Press the AUX MENU key.

– Press the DATA ENTRY UP/DOWN keys until the display

shows ‘Ar. Start’, confirm by pressing the ENTER key.

– Press DATA ENTRY UP/DOWN keys until the display shows

‘POS’, confirm by pressing the ENTER key.

– Press the ENTER key once more.

– The counter does not measure.

– Connect a pulse generator to Ext Arm input.

– Settings for pulse generator: single shot pulse, amplitude TTL

= 0 - 2 VPP, and duration = 10 ns.

– Apply one single pulse to Ext Arm input.

– The counter measures once and shows 10 MHz on the display.

Measuring Functions

Preparation for Check of Measuring Function is as follows:

– Connect a 10 MHz sine wave signal with 2.0 VPP amplitude

via a T-piece to Input A.

– Connect a cable from the T-piece to Input E (Ext Arm) at the

rear.

– Select the measuring function as in the ‘Selected Function’ col-

umn and check that the counter performs the correct measure-

ment by displaying the result as shown under the “Display”

column in the following table.

1) Value depends on the symmetry of the signal.

2) Exact value depends on the input signal.

2-4 Performance Check, Rear Input/Output

Oscillator Frequency readout Suitable refer-

ence

Pass

/Fail

Standard 10.00000000 MHz±120 Hz

PM9691

PM9691 10.00000000 MHz±1 Hz PM6685R

PM6681RPM9692 10.00000000 MHz±0.25 Hz

Table 2-5 Acceptance test for oscillators.

Selected Function Display Pass/ Fail

PRESET

ENTER

DEFAULT?

10 MHz2)

IMP A 50 10 MHz 2)

Non AUTO 10 MHz2)

PER A 100 ns2)

RATIO A/E 1.0000000

PWIDTH A 50 ns1)

TOT A MAN

DISPLAY HOLD Start counting

DISPLAY HOLD Stop counting

DUTY FACT 0.500000 1)

AUTO 0.5000001)

Table 2-6 Measuring functions check.

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Options

Prescaler

This extra HF input (PM9624) is easily recognized by its front panel

connector (Input C, type N).

– Connect the output of the signal generator to the HF input of

the counter.

– Connect the 10 MHz REFERENCE OUT of the generator to

the REFERENCE IN at the rear panel of the counter.

Setting for the counter after Preset.

– Function = FREQ C.

– EXT REF.

Generate a sine wave in accordance with the following table.

– Verify that the counter counts correctly. (The last digit will be

unstable).

Performance Check, Options 2-5

Frequency Amplitude Pass/Fail

MHz mVRMS dBm

100-300 20 –21

-2500 10 –27

-2700 20 –21

-3000 100 –7

Table 2-7 Sensitivity of the PM9624 HF input.

EX TRE F

Fig 2-2 Connect the output of the signal generator to the HFinput of the counter.

Required Test Equipment Suggested Specification

HF signal generator 3.3 GHz

Table 2-8 Test equipment for 3.0 GHz HF input.

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2-6 Performance Check, Options

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Chapter 3

Disassembly

Page 14: Programmable Frequency Counter

The terms in the following figure are used in all descriptions in this

manual.

The PM6685 is available with a number of options and accessories.

The labels on the rear panel of the counter identify the options and

accessories included. If there are no labels, the counter contains an

uncompensated crystal oscillator and no options. The following la-

bels exist:

– PM9624 3.0 GHz HF input

– PM9691 High-Stability Oven Oscillator

– PM9692 Ultra-High-Stability Oven Oscillator

– PM9626B GPIB Interface

The location of these optional parts is illustrated in Fig.3-2.

Removing the Cover

WARNING: Do not perform any internal service or ad-justment of this instrument unless you are qualified

to do so.

WARNING: When you remove the cover you will ex-

pose high voltage parts and accessible terminals

which can cause death.

WARNING: Although the power switch is in the off

position, line voltage is present on the printed cir-cuit board. Use extreme caution.

WARNING: Capacitors inside the instrument can hold

their charge even if the instrument has been sepa-rated from all voltage sources.

– Make sure the power cord is disconnected from the counter.

– Turn the counter upside down.

– Loosen the two screws (A) at the bottom and the two screws

(B) in the rear feet.

– Grip the front panel and gently push at the rear.

– Pull the counter out of the cover.

Reinstalling the Cover

– Gently push the counter back into the cover.

– Turn it upside down.

– Install the two screws (A) at the bottom.

– Install the two rear feet with the screws (B) to the rear panel.

PM9624 (HF Input)

– Disconnect the power cable.

– Remove the cover from the counter.

– Disconnect the cable from the mini-coax connector (A) on the

HF input.

– Press the clips (B) apart and lift the HF input pca straight up

and out.

3-2 Disassembly, Removing the Cover

Top

Left

Right

Front Bottom

Rear

Fig. 3-1 Designations used in this manual.

G 1

Main board

Front panel

PowerModule

GPIB interface

Optionaloscillator

HF input

Fig. 3-2 Location of the boards in the counter.

A

B

A

B

Fig. 3-3 Remove the screws and push the counter out of

the cover.

Page 15: Programmable Frequency Counter

– When installing the HF input, make sure that the connector

pins fit exactly in the holes in the connector housing (C).

PM9626 (GPIB Interface)

– Disconnect the power cable.

– Remove the cover from the counter.

– Loosen the two screws (A) holding the GPIB interface to the

rear panel.

– Disconnect the interface cable from P103.

– Move the GPIB interface pca toward the front of the counter

and lift the pca supports out from the “keyholes” (B) on the

main PCA.

PM9691 or PM9692 (OvenOscillator)

– Disconnect the power cable.

– Remove the cover of the counter.

– Remove the two screws (A) holding the oscillator to the main

pca from underneath.

– Press the clip (B) gently to the front of the counter and lift the

oscillator straight up.

– Make sure that jumpers J14 and J15 are set in the correct posi-

tion.

– When fitting the oscillator, make sure that the connector pins

fit exactly in the holes in the connector housing.

Disassembly, PM9626 (GPIB Interface) 3-3

B

A

B

A

Fig. 3-4 Loosen the two screws in the rear panel and dis-engage the board from the keyholes.

A

Fig. 3-5 One of the two screws holding the oven oscillatorin place.

A

B

BC

Fig. 3-6 Removing the HF Input.

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3-4 Disassembly, PM9691 or PM9692 (Oven Oscillator)

Page 17: Programmable Frequency Counter

Chapter 4

Circuit Descriptions

Page 18: Programmable Frequency Counter

Block Diagram Description

General

The PM6685 Frequency Counter consists of three main units:

– Front unit

– Main board unit

– Rear panel unit

The following options can be added:

– GPIB interface including analog output (PM9626B)

– Prescalers 1.3 GHz (PM9621), 3.0 GHz (PM9624)

– Oven-controlled crystal oscillators (PM9691 or PM9692)

– Rack mount adapter (PM9622/02)

– Battery option (PM9623)

The chassis of the counter consists of a front piece molded in alumi-

num, an aluminum rear panel, and two profiled aluminum rods that

hold the front and rear panels together. This unit can be slid into the

aluminum cover of the instrument.

The front unit contains all functions needed for the user communica-

tion. It is connected to the main board unit with a flat cable, and the

molded front unit is fixed to the two profiled aluminum rods with

screws.

The main board unit consists of a PCB mounted on two profiled alu-

minum rods. Most functions, such as the following, are placed on the

main board:

– Input amplifiers with trigger level circuits

– Power supply

– Measurement logic

– Microcomputer circuitry

Some outputs, such as the trigger levels and probe compensation

view outputs are directly mounted on the main board.

The rear panel unit is of aluminum with a number of mounted con-

nectors. Most of the connectors are soldered directly to the main

board. The rear panel is fixed to the two profiled aluminum rods with

screws.

4-2 Block Diagram Description

Page 19: Programmable Frequency Counter

Block Diagram Description 4-3

Local preset

Optional oscillator

External arming

External reference

HF input

Input Amplifier

Reset circuit

Power supply90-265 V

Micro-computer

CounterASIC

10 MHz out

Gate LED

Display

Analog output

GPIB option

Keyboard

+7V

+5V

-5.2V

AC

I C2

PWM

E

C

D

A

G

RESET

U11

HSI.0

X2EXTCB2EXTREFA

A2

U29

GET

Trigger DAC´s

INTREF

÷2

+12V

Option 80

Fig. 4-1 PM6685 block diagram.

Page 20: Programmable Frequency Counter

Hardware Functional Description

Front Unit

LCD Drivers

An LCD and two LEDs are used as indicators. The LCD is used to

show both the measurement result and the state indicators of the in-

strument setting. The LEDs show standby and gating.

The LCD has 158 segments that are multiplexed with a ratio of 2:1.

Two parallel and synchronized LCD drivers (U201 and U202) are

used. They are connected with a serial I2C bus to the microcomputer

on the main board. The clock frequency of the drivers is approxi-

mately 140 kHz, set by R201. The VLCD pin is connected to GND

on the main board.

The LCD is provided with a backlight, an LED array integrated into

one component. Its current consumption is set by the resistors

R204-R207. The backlight dissipates approximately 1.5 W .

Keyboard

The front panel pushbuttons are connected in a matrix. The scanning

signals H0 to H3 come from the main board. If a push button is

pressed and H0 to H3 is high, one of the output signals V0 to V7 will

be high. The STAND-BY/ON and LOCAL-PRESET buttons are not

part of the scanning but are connected directly to the main board.

The front unit is fixed to the main board unit with three screws. The

electrical connection is made with a 40-lead flat cable to the main

board.

4-4 Hardware Functional Description

U2 02

Dr iver 2

PC F 8576

LCD

U 20 1Dr iver 1

PC F8 576

Sync .

SCL

SD A

Backpl. 0

Backpl. 1

2:1 Multiplex

1 58 segment s

Fig. 4-2 Front panel LCD drivers.

V0-V7

AD0-AD7 H0-H3

AD

0-A

D7

U11

U13A

U14A

LOCAL/PRESET

SDASCL

Main Board Keyboard & DisplayBoard

CPU

HS

1.0

P1

.0P

1.1

Latch

Latch

Fig. 3 Keyboard scanning.

Page 21: Programmable Frequency Counter

Main Board

Introduction

Components not necessary for explaining the function are omitted

from the figures in this chapter. For the complete set of components,

see the circuit diagrams in Chapter 8, Drawings and Diagrams.

Input Amplifier

The input amplifier has 300 MHz bandwidth and is of the split-band

type. It contains four main stages: the signal adaptation stage, the im-

pedance converter stage, the comparator stage, and the buffer stage.

Signal Adaptation

This part of the amplifier contains:

– 50 /1 M impedance selector

– x1/x11 attenuator

– Voltage limiter

50 / 1 M Impedance Selector

The 50 or 1 M impedance modes are selected by relay K1. 50 is selected via the resistors R7 to R17, if the relay is closed. 1 M is

selected if the relay is open. Depending on selected attenuation, the

1 M input impedance is determined by different combinations of

resistors.

In x1 attenuation mode (K2 is closed and K3 is open) the impedance

is determined by resistor network R22 to R28.

In x11 attenuation mode (K2 is open and K3 is closed) the same net-work as in the x1 case is involved plus the resistors R3 to R5 and R18

to R20.

The input capacitance in parallel with 1 M is 24 pF at x1 attenua-tion and 12 pF at x11 attenuation.

The series resistor R1 immediately after the selector serves both as

current limiter together with the voltage limiter (see below) and as

impedance matching resistor. The resistor also improves the Volt-age-Standing-Wave-Ratio (VSWR) of the amplifier input.

x1/x11 Attenuator

The x1 attenuator consists of a resistive low-frequency divider,

which reduces the input signal by a factor of 2, and a capacitive

high-frequency divider. The attenuator is formed by the resistors

R22-R23 and R24-R26 in parallel with R27-R28. The capacitive part

is formed by the variable capacitor C2 in parallel with R22-R23, and

the parasitic capacitance across R24-R26.

The capacitive attenuator is adjusted via variable capacitor C2 to the

same attenuation value as the resistive attenuator.

The x11 attenuator also consists of a resistive low-frequency divider

and a capacitive high-frequency divider. The resistive part is formed

by R1-R5, and R18-R20 in parallel with 1 M (the x1 attenuator im-

pedance). The capacitive divider is formed by the variable capacitor

C1 and the parasitic capacitance at the node where R5, R18 and R22

meet.

Resistors R2 and R6 improve the frequency response.

Hardware Functional Description 4-5

K 1

K2

K3

R6

J 1 C3R1 R2 R3-R5

R19-R20

R18

C2

R24-R26

R22-R23

To V olt age

li mi ter

R7-R17

C1

R27-R28

Fig. 4-4 Impedance selector and 1X/11X attenuator.

Imp. Att. LimiterImp.

Conv. Comp-

arator

Input AA

LPfilter

Trigger

level Comp I

Comp-

arator

Trigger

level Comp II

BufferFlip-

Flop

Buffer÷2 A2

Fig. 4-5 Input amplifier block diagram.

Page 22: Programmable Frequency Counter

Voltage limiter

A voltage limiter that protects the impedance converter against

overvoltage is placed between the attenuator and the impedance con-verter. The voltage limiter consists of resistor R35 and the diodes D1

and D3 to clamp positive voltage and resistor R36 plus the diodes D2

and D4 to clamp negative voltage. The clamp voltage is approxi-mately ±2.1 V for low frequency signals. At high frequency the

clamp voltage rises to approximately ±2.3 V.

Impedance Converter Stage

The analog signal from the input stage is fed to an amplifier stage

where split-band technique is used to get good frequency response

over a wide range. This means that the high-frequency contents of

the signal are fed to a high-impedance AC-coupled FET transistor

stage Q1. The low-frequency contents are fed to a DC-coupled oper-

ational amplifier stage with negative feedback from the output of the

converter stage buffer. The low-frequency path handles frequencies

up to approximately 5 kHz.

The high-frequency signal is fed to the gate of Q1. The high imped-

ance at the gate is converted to a low impedance at the source. The

source is connected to the base of HF transistor Q2, the summing

point for the two signal paths.

To make the FET work well in its active region within the whole dy-

namic range, the FET drain is supplied with +7 V via resistor R42.

The low-frequency signal is divided by the two resistors R27 and

R28 before it is coupled to the input pin #2 of the operational ampli-

fier U1. The resistors R37 and R38 at the operational amplifier out-

put pin #6 center the output swing, and capacitor C6 stabilizes the

operational amplifier stage.

The low-frequency path goes from the operational amplifier to the

base of transistor Q3, the collector of which is connected to the base

4-6 Hardware Functional Description

R35

D3D1

D4D2

R36

+5

-5.2

From

Attenuator

To Impedance

converter stage

Fig. 4-6 Voltage limiter.

Tr ig

L e ve l

+

-

Q1

Q3

Q13

Q4U1

U8

C6

L1

K4

R31

R27

R28

R33

R37

R3

2

R38

R50

R29-R30

- 5 .2 - 5. 2 -5 .2 -5 . 2 -5 . 2

+ 7 + 5

-5 . 2

Fr om Pro t ec t io nci rcu it s

R106

C18-C19

+ 5

Q2

T o

Fli p- Fl o p+

-

R42 R43

R105

C20

C13

R46

R47

K4C5

Fig. 4-7 Impedance converter.

Page 23: Programmable Frequency Counter

of transistor Q2. This point is common to the high and low frequency

paths.

A buffer amplifier with high driving capacity is used to get a linear

output in the 100 load resistor R106 over a swing of 2 V. This am-plifier consists of a driver stage Q2, an output stage Q13, and a cur-rent generator Q4.

From the output of this second amplifier stage, the signal is fed back

to the op amp pin 3 via the divider chain R29 to R32. The trimmer po-tentiometer R31 sets the gain of the low-frequency path equal to the

high-frequency gain of about 0.9. Capacitor C5 is connected to oper-ational amplifier pins #1 and #8 to achieve stable operation. The

trimmer potentiometer R33 between pins #1 and #5 on the opera-tional amplifier is used for adjusting the offset voltage of the opera-tional amplifier.

The channel A filter connected to the output of the second amplifier

stage is a 100 kHz low-pass LC filter. It consists of the coil L1 and the

two capacitors C18 and C19 in parallel. The filter is controlled by the

relay K4. The filter output is connected to the input of the comparator

stage.

Comparator Stage

The comparator stage converts the analog signal from the impedance

converter stage to a square wave. This circuit consists mainly of the

high-speed integrated comparators U8A and U8B plus a separate

trigger level circuit connected to the comparators at pins 9 and 13 via

resistors R87 and R88.

The trigger level circuits, which are described later, generate a DC

level in the range of approximately æ1.6 V. This covers a dynamic

range of 6.4 V since the input signal is divided by a factor of 2 before

it reaches the comparator.

The counter is provided with adjustable hysteresis, i.e., it is control-lable via the front panel or GPIB. The circuitry for setting the hyster-esis consists of the resistor network R91 to R96, supplied with +5 V

and –5.2 V. It is connected to the latch enable inputs of the compara-tor, pin 5 and 7 for Comparator I and pin 17 and 15 for Comparator II.

The input signal is fed to both comparators, the outputs of which are

used for setting/resetting the Flip-Flop U9.

Buffer Stage

Before the signal is fed further into the ASIC U29, it has to be

level-shifted by a buffer stage. The negative ECL logic levels

(~ –0.9 V to ~ –1.7 V) from U9 pins 17 and 18, are converted to a

single-ended signal with CMOS logic levels ( ~ 5 V to ~ 0 V).

The buffer is a differential amplifier consisting of the two transistors

Q32 and Q33 whose bases are fed differentially from the two com-

parator outputs. Resistor R304 serves as a current generator that is

switched alternately to the two collector resistors R296 and R297.

Trigger Level Circuits

The trigger level circuits generate the trigger voltage levels to the in-

put comparators. The trigger level range is –3.2 V to + 3.2 V with a

maximum resolution of 0.6 mV. The input amplifier attenuation is

Hardware Functional Description 4-7

U8A

U9

U9

U8B

- 5.2

+5

Q32 Q33

R2

97

R2

96

T o

C ou nter

c ir cu itsF lip -

F lo p

+ 5

- 5.2

R9

3R

94

T rig ger Level I

Tri gger Level I I

Input si gnal

A

B

C

D

E

F

G

A

B

C

D

E

G

F

F

R9

1

R92

R96

R87

R88

TP27 TP26

+

-

+

-

R3

04

Fig. 4-8 Comparator flip-flop and buffer stages.

Page 24: Programmable Frequency Counter

approximately 2 times. The trigger level circuits generate a DC level

that has the same attenuation. This means that the output of this cir-cuit has a range of –1.6 V to +1.6 V with a resolution of maximum

0.3 mV. A dual 8-bit DAC is used. The DACs only generate voltages

between 0 and +1.6 V, but by using a X2 amplifier and an offset shift

of 50%, the voltage range of –1.6 V to +1.6 V is achieved. The supply

voltages to the trigger level circuits are filtered by R and C to prevent

noise originating in the digital circuitry from influencing the trigger

levels. The ground plane under the trigger level circuits is separated

from the rest of the ground plane, and the planes are connected only

at the front of the counter.

The trigger level circuits consist of the following:

– Resistor network R57 to R68 for generating the reference volt-

ages 0.04 V, 0.22 V, 0.59 V, and 1.6 V.

– Three multiplexers (U3) to select one of the levels. With this

arrangement there is a total trigger level range of

–1.6 V to +1.6 V.

– A double DAC (U4).

– Two current-to-voltage converters U6. These circuits convert

the current at the IOUT pins of the DACs to a voltage. This

signal has a range of 0 V to approximately 1.6 V.

– Two amplifiers, U7, with an amplification of X2, to generate a

signal with a range of 0 V to 3.2 V. Resistors R69 and R70 set

the reference voltage to the amplifier to get the 50 % offset

shift. To get exact voltages, 0.5 % precision resistors are used:

R73-R75, R78-R79 and R80-R82, R85-R86.

– The zero adjust of the trigger levels is done with trimmer po-

tentiometers R69 and R70 connected to the amplifiers in U7.

– Two low-pass filters R87-C29 and R88-C30.

4-8 Hardware Functional Description

- 5.2

+ 5

V RE F R F B

IOUT

D0- D7

+ DA CA

V RE F R F B

IOUT

U4

U6

U3

R88

U7

R69

Tr ig ger l evel C omp I

A D0-A D2AD0- A D8

- 5.2

+ 5

R85-R86

R82 U7

R70

1 . 6V0 .59V0 .22V0 .04V

R87

R78-R79

Tr ig ger l evel

Comp I I

C om par ator I

C omp ara to r I I

R75

R73-R74

R80-R81

C29

C30

U6

Fig. 4-9 Trigger level circuits.

Page 25: Programmable Frequency Counter

Power Supply

General survey

The power supply generates four regulated DC supply voltages to the

counter, as well as some other supply voltages for special purposes.

The power supply block also contains the ON/STANDBY logic.

The main building block of the power supply is a primary switch

mode power module (U39). The line power AC voltage (90 V to

265 V) is rectified to a DC voltage before it is fed to the power mod-

ule.

After a line power filter in the power inlet, a fuse of 1.6 AT and an

NTC resistor protect the power supply. The fuse F1 should only blow

if a catastrophic error occurs on the primary side of the power supply.

A short-circuit on the secondary side should not affect the primary

side. To minimize the inrush current to the capacitors at the connec-

tion of the power cord, an NTC resistor (R148) is used. The resis-

tance is 15 when the resistor is cold but decreases to a few ohms as

it is warmed up by the steady-state current.

The AC voltage is rectified in the bridge rectifier D9 and filtered in

C64. C65 suppresses noise from D9. L6 and C82-C83 serve as a fil-ter at the input of U39.

All inputs and outputs of the power module have HF chokes. The

module is mounted with distance washers on the main board.

From the module there are three DC voltages outputs. One of those is

regulated (+ 5 V) and the others are unregulated. These voltages will

vary with input line voltage, the current at + 5 V, and at the unregu-lated voltages. The output marked +15 will be approximately +18 V,

and the output marked –7 will be approximately –8 V. The outputs

are filtered; HF is filtered by C70-C73, and LF is filtered by L7-L9

and C74-C76.

Hardware Functional Description 4-9

U

U U +7 V

+12 V

+12 V*

+5 V

-5.2 V

FanPM6685R

only

On

M

Filt

er&

Fu

se

Po

we

rM

od

ule

ain

sIn

let

Stand by

U40B

D9

U39

+15

+5

-7

U43

U41

*) for ON/STBY control & OCXO

U21A&Q17

Q14

K5

U42

J31

K5

R1

30

-R1

45

U

R1

49

-R1

55 J15

R156

+-

Q5-Q6

Fig. 4-10 Power Supply.

Page 26: Programmable Frequency Counter

Function

The three DC voltages from the power module are used for

generating the following four supply voltages in the counter:

+5 V

Regulated +5 V from the power module is used directly.

–5.2 V

–7 V is used, with regulator U43.

+12 V

+15 V is used, with regulator U41.

+7 V

Stabilized +12 V is used, with regulator U21A and Q17.

The following supply voltage is used for a special purpose:

+12 V*

This voltage comes directly from the +12 V regulator U41and will be

present as soon as the power cord is connected, regardless of the po-

sition of the ON/STANDBY switch. It is used for the ON/STANDBY

control logic and for supplying an optional OCXO in STANDBY to

avoid the long warm-up time otherwise needed to obtain maximum

accuracy.

At stand-by, the four main supply voltages are switched off, but as

described above, some parts of the instrument should not be

diconnected. Therefore the power module will never be switched off.

The PM6685 has consequently only a secondary power switch.

A relay (K5) disconnects the load on the +5 V and –5.2 V at stand-by.

Because the power module must always have a load on the regulated

voltage, seven bleeder resistors R149-R155 are always connected to

+5 V via J15. At stand-by the counter only needs +15 V, so a dummy

load consisting of R130-R145 is connected to the power module by

means of the relay K5 in order to stabilize the operation of the

switchmode converter.

+5 V controls the switching on/off of +12 V and +7 V. When +5 V is

on, Q6 and Q5 will conduct, i.e. +12 V will be on. If there is no +5 V,

Q6 and Q5 will be off, thus blocking the +12 V.

The ON/STANDBY logic controls relay K5, which operates as de-

scribed above. It is also possible to open the relay by changing the

position of J16.

The ON/STANDBY logic consists of the RS (set-reset) flip-flop

U40B that is controlled by the ON/STANDBY button on the front

panel. Pressing STANDBY will apply a high voltage (+12 V) to the

set input. The inverting output of the flip-flop will be low, discon-

necting K5 via Q14. Pressing ON will give a high voltage (+12 V) on

the reset input. The inverting output of the flip-flop will be high,

engaging K5. Inserting the power cord into the power inlet will cause

a pulse on the reset input, via C35. The microcomputer can disable

the ON/STAND-BY button via Q12 and Q7. This is done in remote

mode and during RAM-testing. A high level on the base of Q12 en-

ables STAND-BY, a low level disables it.

The STAND-BY indicator on the front panel is controlled by the

+5 V via Q16. +5 V off lights the STAND-BY LED that is fed by the

uninterruptible +12 V*.

+5 V also indirectly controls the fan in the PM6685R. It is a 12 V DC

fan that operates only if +12 V is on. An NTC resistor, serving as a

temperature sensor, controls the speed by applying a variable refer-ence voltage to the fan voltage regulator U42.

Counter ASIC

The main part of the counting logic is integrated in a CMOS ASIC

specially designed for the Fluke MultiFunction Counter series. There

are also analog blocks included in the 100 pin QPF package.

MUX

The MUX block is a switchboard for incoming and internal signals

involved in the measuring process. Some signals are divided by 2 to

make it possible to measure higher frequencies. The trigger slope is

controlled by the MUX block as well. A trigger edge detector senses

the presence or absence of comparator pulses and controls the trigger

level DAC’s in the TLDAC block. These functional units form an es-sential part of the Auto Trigger System.

OSC

The oscillator block generates, selects, and distributes the reference

clock for the circuit. The active semiconductors of the standard oscil-

lator are included in this block. The crystal is connected to pins X1

and X2. A TCXO or OCXO is connected to X2 only. An external ref-

erence clock is connected to EXTREF. The PWM signal generated at

OTRIM controls the frequency of the reference oscillator after exter-

nal integration.

PG

A built-in pulse generator having the 10 MHz clock as a reference

can generate pulses with controllable duration and repetition rate at

the OUTPUT connector. The level is fixed TTL.

RTC

A real time clock not used at present.

TLDAC

This block contains two 10-bit DAC’s generating the trigger levels

for the input comparators, VOUTA for channel A and VOUTB for

channel B. An external reference voltage is connected to V+REFA

and V+REFB.

HO

The Hold Off block can manipulate the internal measuring signal X

in several ways. One operating mode simulates a low pass filter (nor-

mal hold off), another mode is used in burst measurements.

The following blocks (SYNC, STST, CNTS and MCTRL) form the

actual measuring logic in the ASIC. Three types of measurements

can be made in this MEAS block:

Continuous measurements (frequency, ratio and period average).

Not used at present.

Controlled measurements (time interval, period single, pulse width,

frequency, totalize gated, totalize start-stop, and ratio).

Totalize manual.

SYNC

The SYNC block synchronizes the actual measurement with certain

internal or external events like measuring time and arming signals.

STST

The start and/or the stop of the measurements are controlled by this

block. External events can be used to define the exact moments.

4-10 Hardware Functional Description

Page 27: Programmable Frequency Counter

CNTS

Two 32-bit binary counters count external events or keep track of the

time.

Interpolator

This block is not used at present.

MCTRL

The different events in the measurement cycle of the ASIC are timed

by this block.

MPI

This is the microprocessor interface block. The bus width is 16 bits,

AD0 to AD15. Interrupts to the microprocessor are generated at INT.

GET

The GET signal from an optional GPIB interface can control the start

of a measurement.

External Interpolator

The X-POLATOR unit is connected directly to the internal

interpolator in the ASIC. It is used for increasing the time resolution

beyond the limits set by the reference clock period of 100 ns. An er-

ror pulse is generated in the SYNC block. Its width is determined by

the difference between an external event on an input channel and the

next clock pulse. This pulse controls a current generator charging a

capacitor. When the pulse has expired the voltage across the capaci-

tor is A/D converted and the value is added to the result. There are

two interpolators, one for the start event and one for the stop event.

They are calibrated over the possible error pulse range to allow for

any aberrations from the theoretical linear behavior.

Oscillator Circuits

CPU Oscillator

The microcontroller U11 is clocked at 12 MHz. The crystal B1 is

connected to the XTAL inputs of the microcontroller.

Reference Oscillators

A 10 MHz crystal oscillator is used as the reference for the measur-

ing logic. If a stable external 10 MHz reference is available, it can be

connected to REF IN on the rear panel and selected by means of the

EXT REF button on the front panel.

In addition to the standard crystal oscillator there are two optional

oven-controlled crystal oscillators (OCXO) to choose from.

Standard

The uncompensated standard oscillator consists of the crystal B2,

C109, C113-C115, R209 and R211. C115 is used for manual adjust-

ment of the frequency when the calibration tolerance has been ex-

ceeded. The active circuitry is built into the ASIC U29 and is accessi-

ble via the pins marked X1 and X2.

OCXO

If one of the OCXOs is mounted, the standard oscillator has to be in-

activated by moving the jumpers J23 and J25 to their alternative po-

sition. These oscillators are connected to J24 and are self-contained

Hardware Functional Description 4-11

FIN

1

MUX HO SYNC CNTS

STST

Inter-

polator

MCTRL

TLDAC

RTCPG

OSC

MPI

A2

A

SR

B

B2

EXTC

P

BURST

TRA

TRB

VCCO

GNDD1

GNDD2

GNDD3

GNDD4

GET

X1

X2

V+REFO

OTRIM

V-REFO

EXTREF

MTCXO

INTREF

OUTMUX

MPCLK

PH1

PH2

VCCB

GNDB

VCCC

GNDC

GNDA

VCCA +5

PGARM

M REF

F REQC

TIME

M CLK

RESET

CY1

CY2

VCCG

GNDG

VREFADIRES

INTP1

INTP2

INTS1

INTS2

FIN

MTIM E

V+REFA

VOUTA

V-REFA

V+REFB

VOUTB

V-REFB

VCCE

GNDE

VCCF

GNDF

X

Y

XH

YH

HOSX

HOSY

CLOCK

STOP

START

GA

TE

O

R1

R2

L1

L2

STAARM

STOARM

STADLY

STODLY

TOTSTA

STA

INTBINTA

SB

SA

I FN

aI

FN

bO

Ka

OK

b

PCL

OK

DM

AR

DM

AB

R

CS RS SS

PGTRIG

PGREF

PG

OU

T

PGTRIG

PGARM

MCLK

MCLK

PGOUT

CLOCK

STAARM

STOARMSTADLY

STODLY

HOSX

HOSY

GET

TOTSTA

STA

FREQC

TIME

MREF

RTC

RT

C

R1

R2

L1

L2

XH

YH

X

Y

PCL

ST OP

ST ART

HODLYX

HODLYY

I FN

A

FI

NB

IF

NC

IF

ND

OK

A

OK

B

OK

C

OK

D

PG

RT

CX

1

RT

CX

2

AL

AR

MN

VB

AT

AD

0-A

D1

5

AL

E

RD

N

WR

HN

WR

LN

CS

A1

6

A1

7

A1

8

A1

9

HO

LD

N

HL

DA

N

QD

MA

N

INT

S1

N

S2

N

S3

N

S4

N

S5

N

C1

C2

C3

C4

HODLYX

HODLYY

CLOCK

PGREF

VCCX +5

Fig. 4-11 Counter ASIC, block diagram.

Page 28: Programmable Frequency Counter

units with facilities for coarse and fine adjustment. They are fixed to

the main PCB with two screws. The output signal is AC-coupled to

the X2 pin on U29 via C107.

External

This input consists of an AC-coupled line receiver with Schmitt trig-

ger function (U28) and is protected against excessive voltage

excursions by a resistor-diode network. The output signal from U28

has CMOS logic levels and is connected to the EXTREF pin on the

counter ASIC U29.

Logic

Microcomputer Circuits

Microcontroller

The microcomputer circuitry consists mainly of the microcontroller

U11, an Intel 16-bit CMOS 80C196, RAM (U22A), and EPROM

(U23A). The microcontroller is clocked at 12MHz. The data and ad-

dress lines AD0 to AD15 are shared by means of multiplexing.

Therefore the addresses are stored in the latches U16A and U17A.

The ALE signal (Address Latch Enable) enables the latches.

UVEPROM

The main program is stored in U23A that is mounted in an IC socket,

making it easy to update and customize the instrument firmware by

changing the EPROM.

EEPROM

Front panel settings, GPIB address and certain other data that are not

changed frequently, e.g. information in the Protected User Data

Area, are stored in U12A which does not need battery backup.

Reset Circuit

A special reset circuit, the power supply supervisor U10, is included

in the design. If the +5 V supply line becomes lower than 4.5 V, the

reset output pin 5 goes low and the microcontroller will start over.

The length of the reset pulse is set by C88; 2.2 µF gives a pulse of ap-

proximately 30 ms. U10 also controls the reset pulse during

power-up so that the microcontroller will be initiated correctly.

Keyboard Scanning

The keyboard scanning is done in two modes. The first mode is ac-

tive as long as no button has been detected as depressed. Then all out-

puts of U13A are set high, and the latch U14A is read. If no button

has been depressed, all outputs are low. This check is done at every

timer interrupt in the microcontroller, every 25 ms. If a button is

depressed, one of the output bits is high. When this event is detected,

mode two is entered. The outputs of U13A must be set high one after

the other to find the specific button. When found, only this button

will be checked, so other simultaneously depressed buttons will not

be recognized. The depressed button must stay down for several

timer interrupts before action is taken. After the button has been rec-

ognized, the timer interrupt SW will be waiting for the button to be

released. The button must be released for several timer interrupts be-

fore the keyboard scanning returns to mode 1. Then the search for

other activated buttons can be resumed.

The following three buttons are not scanned in this way:

– The ON button is connected to the ON/STANDBY logic in the

power supply.

4-12 Hardware Functional Description

RAMUV

EPROM

OM LCDDrivers LCD

Address & Data Bus

Address Bus

LatchKey-board

rd

CounterASICCPU Latch

I C Bus2

GPIB EEPROM

Fig. 4-12 Microcomputer circuits, block diagram.

V0-V7

AD0-AD7 H0-H3

AD

0-A

D7

U11

U13A

U14A

LOCAL/PRESET

SDASCL

Main Board Keyboard & DisplayBoard

CPU

HS

1.0

P1

.0P

1.1

Latch

Latch

Fig. 4-13 Keyboard scanning.

Page 29: Programmable Frequency Counter

– The STAND-BY button is connected to the ON/STANDBY

logic in the power supply.

– The LOCAL/PRESET button is connected directly to input pin

24 on the microcontroller U11. Pressing this button sends an

interrupt to a special handler in the SW.

Rear Panel Unit

The rear panel contains the following connectors

INPUTS:

– External reference input D - REF IN (BNC)

– External arming input E - EXT ARM (BNC)

– Power supply inlet including EMI filter

OUTPUTS:

– Internal reference output G - 10 MHz OUT (BNC)

If a GPIB interface is installed in the device, it is mounted on the rear

panel and connected to the main board with a flat cable.

Besides the normal standard GPIB connector, this optional unit also

has a BNC connector capable of outputting an analog representation

of any three consecutive digits on the display.

There is also a 6 SPST DIP switch on this unit for setting the default

GPIB address.

Hardware Functional Description 4-13

OF FO N

G D E

1 6 8 4 2 1

R L1 , D C1 , DT 1, E 2S H 1, AH1 , T 5 , L4 , SR 1 ,I E E E 4 88 / IE C 62 5 INT ER F ACE

A DDR E S S

90 V - 26 5V

1 . 6 ATP R I MA RY F U S E I N S ID E

- I NT - S T B Y

B AT T E R Y

A NA L O G O U T

1 0 M Hz O U T R E F I N E X T AR M

P M9 6 2 1

P M9 6 2 3

P M9 6 2 4

P M9 6 2 5

P M9 62 6

P M9 67 8

P M9 69 0

P M9 69 1

P M9 6 28 / 85

_ _ _ _ _ __

_ _ _ _ _ __

P M9 6 9 7 - EX T /L I NEP O WE REXT SUPPLY

12-24V DC

Fig. 4-14 Rear panel.

Page 30: Programmable Frequency Counter

Optional Units

GPIB Interface Including Analog Output

GPIB, PM9626B

The GPIB interface controls the communication between the internal

microprocessor and the external GPIB bus. A 32K extension of the

ROM and RAM is placed on the interface board. An analog output is

also included. The PCB is connected to J18 on the main board with a

ribbon cable and fixed to the rear panel with two screws. Two metal

studs at the rear edge of the PCB are inserted in slots on the main

board in order to relieve mechanical stress.

The GPIB control circuit, IC113, communicates with the external

GPIB bus via the bidirectional bus drivers IC114 and IC115. IC113 is

controlled from the microprocessor by writing and reading in the in-

ternal control registers. If IC113 has a message for the microproces-

sor, it uses the GPIB interrupt signal. The address switch setting is

read by the microprocessor via IC116.

A 32K extension of both ROM (IC109 and IC110) and RAM (IC111

and IC112) is placed on the interface board. The circuit board is pre-

pared for a 16-bit extension, but only 8 bits are used. IC110 (ROM),

IC112 (RAM) and R118 are not mounted. IC107, IC108 are address

latches and IC101, IC106 and IC117 use the latched address to gener-

ate chip select and chip enable signals for internal use on the GPIB

board.

Analog Out

The result on the display can be converted to an analog signal by

means of a pulse-width-modulated (PWM) signal from the micro-

processor. The signal is filtered, attenuated, offset-adjusted, inte-

grated and buffered by IC103 and supporting passive components to

give an analog DC level between 0 and 4.98 V with a resolution of

20 mV. The analog output has a separate analog ground connected to

the cabinet.

HF Input

You can add an optional prescaler. This HF input is mounted on the

main board, to the right of the input amplifier. It is connected to J19

where there are three pins reserved for ID coding. Preparations have

thus been made for other prescalers with different prescaling factors.

Prescaler 3.0 GHz, PM9624

This prescaler cannot be repaired at a local workshop. It must be sent

to the factory for repair.

The prescaler consists of the following parts:

Limiter

– The limiter consists of a 6 dB attenuator and a PIN diode at-

tenuator to achieve constant input amplitude to the amplifiers.

Amplifier

– Five amplifier stages are divided into three blocks. One block

consists of one amplifier. Two blocks consist of two amplifierseach and an AGC control.

Automatic Gain Control (AGC)

– Helps the amplifiers retain a constant output amplitude.

Dividers

– Two dividers divide the input signal frequency by 16.

Detector

– Detects whether the level of the input signal is high enough to

ensure correct measurement and, if not, blocks the output sig-

nal from the prescaler.

Positive Voltage Regulator

– Supplies a well-regulated voltage to the HF amplifiers.

4-14 Hardware Functional Description

IC113

IC101/106/117

IC114/115

IC107/108

IC116

AD0-15

A0-15

+5V

GPIB

connector

IC109/

110

IC111/

112

Ba

sic

bo

ard

Fig. 4-15 GPIB interface.

IC103

IC103

+7V-5.2V

Analog

OutPWM

Full scale

Zero

Fig. 4-16 Analog output.

Page 31: Programmable Frequency Counter

Software Functional Description

General

The PM 6685 software is divided into two main modules: the GPIB

and DEVICE modules. The GPIB fully implements the Message Ex-

change protocol as described in the IEEE 488.2 - 1987 standard.

The DEVICE module is a real-time measurement executive that can

be interrupted to do other tasks, such as handling the keyboard, per-

forming bus commands etc.

The basic structure of the main module is as follows:

main PM6685()

Initialize();

while (TRUE)

if (BREAKFLAG_KEYBOARD)

HandleKeyboard();

if (BREAKFLAG_PRESET)

PresetDevice();

if (BREAKFLAG_GPIBCOMMAND)

ExecuteGpibCommands();

if (BREAKFLAG_RESTART)

RestartMeasurement();

while (not any BREAKFLAG)

Measure( );

All break flags are set by interrupt-driven events, either from exter-nal functions (the GPIB interface) or from internal functions (timers

etc.).

The Initialize procedure does all necessary initialization at power

up. It also does the power up tests. See Power-On test in chapter 2.

The Handlekeyboard procedure controls all user input/output via

the front panel, except displaying the measurement results.

The PresetDevice procedure reprograms the complete device when

the PRESET key has been pressed (in local mode). It aborts pending

measurements.

TheExecuteGpibCommands procedure executes GPIB commands

and, if a query is received, it starts the response formatter and sends

the requested data to the GPIB interface. If the display is switched

on, the results are also displayed.

The RestartMeasurement procedure aborts pending measure-ments; the measure loop will later continue to measure. This is

mainly used when the RESTART key is pressed.

TheMeasure procedure is the measurement control loop that is used

in local mode. It sends its result to the display.

The ParseGpibInputData procedure parses the GPIB messages

found in the input buffer and sends executable statements to the

ExeceuteGpibCommands procedure. The input of data to the input

buffer from the external GPIB interface is fully controlled in inter-rupts. These interrupts are always enabled so the new data bytes can

be stored in the input buffer while parsing commands. This

ParseGpibInputDat is also executed in interrupt.

Software Functional Description 4-15

Page 32: Programmable Frequency Counter

Test Routines

Test Routines via AUX MENU Key

The test routines are the routines accessible via the AUX MENU key.

Refer to the PM6685 Operators Manual.

Power-On Tests

At power-on some tests are automatically performed. If any of these

tests fails, an error message is displayed and the instrument is halted.

Pressing the LOCAL/PRESET key makes the device continue inde-

pendently of the detected error, but without performing the next tests

in the start-up sequence.The following tests/actions are performed:

– Write 001 to internal test pins

– Pulse all microcomputer i/o ports twice

– Write 0.1 on display

– Write 0.1.2. on display and 010 on test pins

– Test mC internal RAM ( error = Err mC & halt)

– Write 0.1.2.3 to display and 011 on test pins

– Test mC timer ( error = Err mC & halt)

– Write 0.1.2.3.4. on display and 100 on test pins

– Test main board RAM ( error = Err ra. & halt )

– Write 0.1.2.3.4.5. to display and 101 to test pins

– Test ASIC ( error = Err. 5xx & halt)

– Write 110 on test pins

– Check display (light all segments for 2 s)

– Clear Display

– Perform GPIB RAM test if GPIB is installed

(error = Err ra. & halt)

– Write 111 on test pins ( final value)

– Clear display and start normal measurement procedure

4-16 Software Functional Description

Page 33: Programmable Frequency Counter

Chapter 5

Repair

Page 34: Programmable Frequency Counter

Preventive Maintenance

Calibration

To maintain the performance of your counter we recommend that

you calibrate your instrument every year, or more often, if greater

time base accuracy is required. Calibration should be performed with

traceable references and instruments at a certified calibration labora-

tory. Contact your local Fluke representative for calibration.

To know the present status of your instrument, test your timer/coun-

ter from time to time. The test can be made according to the informa-

tion in Chapter 2, Performance Check.

Oscillators

The frequency of the reference crystal oscillator is the main parame-ter affecting accuracy in a counter. The frequency is affected by ex-ternal conditions like the ambient temperature and supply voltage,

but also by aging. When recalibrating, the reference crystal oscillator

is compensated only for deviation in frequency due to aging.

Some important points:

– The high stability oscillators have been built into an oven in

order to keep the oscillator temperature as stable as possible.

Continuous operation is also important for stability. After a

power interruption, the oscillator restarts at a slightly different

frequency. It will then, as time goes on, age at an equal rate.

– The stability indicated for the oscillators is valid within a tem-

perature range of 0 to +50 °C, with a reference temperature of

+23 °C. If the timer/counter is used in a room temperature of

20 to 30 °C, the temperature stability of an OCXO will be in-

creased by a factor of 3.

– The temperature stability indicated for the standard oscillator is

mainly dependent on the ambient temperature. When the coun-

ter is operating there is always an internal temperature increase

that will influence the oscillator.

Recalibration intervals

The Mean Time Between ReCalibration, MTBRC, is defined as:

MTBRCAcceptable error Temperature stability

Agi= −( ) ( )

( ng)

MTBRC can be calculated when the total acceptable error and the

oscillator specifications are known.

The total acceptable error is defined as:

( )( )

(Acceptable error

Deviation of reference frequency=Nominal reference frequency)

5-2 Preventive Maintenance

Model PM6685 PM6685R

Option:

Timebase type:

Standard

UCXO

PM9691

OCXO

PM9692

OCXO Rubidium

Total uncertainty, for operating temperature

0 °C to 50 °C, at 2 (95%) confidence interval:

- 1 month after calibration

- 3 months after calibration

- 1 year after calibration

- 2 years after calibration

< 1.2 x 10-5

< 1.2 x 10-5

< 1.2 x 10-5

< 1.5 x 10-5

< 3 x 10-8

< 4 x 10-8

< 1 x 10-7

< 2 x 10-7

< 8 x 10-9

< 1.2 x 10-8

< 2.5 x 10-8

< 5 x 10-8

< 4 x 10-10

< 4 x 10-10

< 4 x 10-10 *

< 6 x 10-10 *

Typical total uncertainty, for operating

temperature 20°C to 26°C, at 2 (95%) confi-

dence interval:

- 1 month after calibration

- 3 months after calibration

- 1 year after calibration

- 2 years after calibration

< 4 x 10-6

< 4 x 10-6

< 7 x 10-6

< 1.2 x 10-5

< 3 x 10-8

< 4 x 10-8

< 1 x 10-7

< 2 x 10-7

< 8 x 10-9

< 1.2 x 10-5

< 2.5 x 10-8

< 5 x 10-8

< 1 x 10-10

< 2 x 10-10

< 2.5 x 10-10 *

< 5 x 10-10 *

*After 1

styear of operation. For 1

styear add: < 3 x 10

-10

Table 5-1 Stability of timebase oscillators.

Page 35: Programmable Frequency Counter

Example:

– A user can accept a maximum of 3 Hz deviation on the

10 MHz frequency of the oscillator. This results in:

( )Acceptable error =×

= × −3

10 103 10

6

7

The aging and temperature factors can be selected from the table on

page 5-2.

The value of the aging factor is correctly selected from the table

when the calculation of MTBRC results in 1 to 30 days (use /24h), 1

to 12 months (use /month) or over 1 year (use /year) (not, e.g., 43

days or 17 months or 0.8 years).

Example:

– The user has the same requirements as in the example above.

The counter has a PM9691 oscillator.

– Look up information about PM9691 in the table on page 5-2.

The results will be the following:

Relative Frequency deviation caused by:

– Ambient temperature deviation

(within 0 to 50 °C; reference point at 23 °C): Less than

3 * 10–8

– Aging/year: Less than 1.5 * 10–7

– Use the MTBRC formula with the above values. This gives a

MTBRC of maximum:

3 10 3 10

15 1018

7 8

7

× − ××

=− −

−.. year

NOTE: When recalibrating, the reference crystal oscillator will be

compensated only for frequency deviation caused by aging.

When to Replace the Fan(PM6685R only )To maintain the high reliability of a counter used in

around-the-clock’ applications, you must replace the fan every sec-

ond year. For part time and low ambient temperature use, you can ex-

tend this service interval to 6-10 years or more. Additional informa-

tion can be found in Chapter 9, Appendix.

Preventive Maintenance 5-3

Page 36: Programmable Frequency Counter

Troubleshooting

General

Quick Troubleshooting

The PM6685 is a highly integrated Frequency counter with dedicated

LSI counter circuits and microcontrollers that control the complete

units. The microcontroller can help you locate faulty parts by run-ning test programs and generating stable signal patterns on t

he bus. If the microcontroller does not work or the fault is in a part of

the counter that cannot be accessed by the microcontroller, tradi-tional troubleshooting must be performed.

Where to Start

After reading the safety instructions, continue with this chapter for

troubleshooting and repair instructions. When you have fixed the in-

strument, always do the Safety Inspection and Test after Repair, as

described later in this Chapter. Then do the checks in Chapter 2, Per-

formance Check. Recalibrate if required by following the adjustment

instructions in chapter 6, Calibration Adjustments.

Logic Levels

The PM6685 contains logic of four families. The levels for these

families are listed in the following table.

Required Test Equipment

To test the instrument properly using this manual, you will need the

equipment listed below. The list contains specifications for the criti-

cal parameters.

PROM Identification

There are two different PROMs in the PM6685, one on the main

PCB containing the instrument firmware, the other on the optional

GPIB board, containing the interface bus firmware.

They have labels with version designation of the traditional form

Vx.yz, where x, y, and z are digits. The last digit can be followed by a

single letter. The version numbers do not have to coincide, except for

the last letter. So the combination Vr.stE and Vu.vwE is valid,

whereas Vr.stE and Vu.vwF is not.

Operating Conditions

Power voltage must be in the range of 90 to 260 VAC.

Introduction

The troubleshooting strategy for the PM6685 is an integrated part of

the overall service strategy for the instrument. This instrument is hi-

5-4 Troubleshooting

Positive

ECL

Negative

ECL

CMOS TTL

Supply voltage +5 V -5.2 V +5 V +5 V

Signal ground 0 V 0 V 0 V 0 V

Input voltage

High, VIH >+3.9 V >-1.1 V >+4 V >+2 V

Low, VIL <+3.5 V <-1.5 V <+1 V <+0.8 V

Output voltage

High, VOH >+4 V >-1 V >+4.9 V >+2.7 V

Low, VOL <+3.3 V <-1.7 V <+0.05 V <+0.4 V

Bias ref. voltage, VBB +3.7 V -1.3 V - -

Table 5-2 Logic levels.

Type Performance

DMM 3.5 digits

Oscilloscope 300 MHz 2-channel

Signal generator 3300 MHz

Power supply 12 V/2 A

BNC-BNC 50 cables RG-58

Table 5-3 Required test equipment.

INPUTAMPLIFIER(Level 9)

D/ACONVERTERS (Level 8)

MEASURING LOGIC(Level7)

KEYBOARD (Level6)

INTERNAL CONTROLSIGNALS& DISPLAY(Level 5)

MICROCO MPUTER KERNEL (Level 4)

MICROCONTROLLER (Level 3)

OSCILLATOR(Level 2)

POWERSUPPLY(Level 1)

GPIB(Level 10)

Fig. 5-1 Functional levels.

Page 37: Programmable Frequency Counter

erarchically designed in different levels, and troubleshooting can be

performed in any design level if the lower levels are OK. It is, there-fore, important to disconnect all options at the beginning of the trou-bleshooting procedure.

Power Supply

Connect the counter to line power.

– Set the counter to STAND-BY mode.

– Check that the voltage between J9 and J10 is in the range of

90 to 260 VAC, (see Fig. 5-2).

– Check that the input voltage to the power module, U39 be-

tween pin 1 and pins 4 and 5 on the bottom side of the PCA, is

120 to 375 VDC.

– Move the jumper J16 to the DISCONNECT position.

– Check the “STAND BY” voltages after the power module,

U39. Use for instance the screen around the input amplifier asground connection. There are also a number of ground pads on

the PCB available for this purpose.

*NOTE: If this voltage does not meet the above-mentioned

spec, and if it is not possible to adjust it, the output

resistances of the module must be checked.

To verify the Power Module proceed as follows:

– If the primary fuse is broken, there is a short circuit in the

primary circuits. Use a DMM and try to locate the fault byresistance measurements.

– Disconnect L6 and check the resistance between pin 1 andpins 4 and 5 on the power module. The DMM should notshow a short circuit. Put L6 back.

– Check that the DC voltage between pin 1 and pins 4 and 5on the power module is about 2 times the inputAC-voltage. If not, use traditional troubleshooting tech-niques to locate the fault.

– Remove the power cable from the counter.

– Measure the resistances according to the table below.

– If one of the above-mentioned measurements shows 0 ,

remove L7, L8, and L9 and use conventional troubleshoot-ing techniques to isolate the fault.

– Measure the resistances according to the table below.

If the resistances deviate considerably from the values in the table,

the complete power module must be replaced.

– Move jumper J16 to the CONNect position.

– Connect the power cable to the counter.

– Switch the counter ON.

– Check the “POWER ON” voltages.

*NOTE: If the +5 V voltage is outside the specification, all

other levels will be wrong, since they are based on the

+5 V level.

If you find any fault, continue with traditional troubleshooting tech-niques and replace defective circuits. Also refer to Power Supply in

Chapter 4, Circuit Descriptions.

Troubleshooting 5-5

Power

Modu le

Fuse

TP23, +5TP20, -5.2

TP22, +7

J10

J9J4

J3

+5V adjust

6 14

1 5

TP21,+12V

TP15, +5TP17, -7

J15

TP16, +15

LoadDisco

nne

cted

Con

ne

cted

J21

J16

Fig. 5-2 Test points and trimmers for the power supply.

Test Points Voltage

TP15 +5.10 V ± 10 mV*

TP16 +14.8 V to +21 V

TP17 –12.5 V to –7.5 V

TP21 +12 V ± 0.5 V

Table 5-4 Standby voltages.

Test Pins Resistance

(GND) and TP15 (+5 V) 10

(GND) and TP16 (+15 V) 1.5 k

(GND) and TP17 (–7 V) 270

Table 5-5 Output resistances.

Test Pins Resistance

10, 11 and 13, 14 150

8 and 9 1.5 k

6 and 7 270

Table 5-6 Output resistances.

Test Points Voltage

TP23 +5.06 V ± 30 mV*

TP20 –5.2 V ± 50 mV

TP22 +7 V ± 100 mV

Table 5-7 Power-on voltages.

Page 38: Programmable Frequency Counter

Oscillator

Standard Oscillator

– Be sure the jumpers J23 and J25 are in the STD position, (see

Fig. 5-4).

– Check that 10 MHz is present at U29, pin 42.

– Check that 10 MHz is present at the rear panel connector

10 MHz OUT (J27).

If you find any fault, continue with traditional troubleshooting tech-

niques and replace defective circuits. Also refer to Chapter 4, Circuit

Descriptions, Oscillator Circuits.

OCXO, PM9691 or PM9692

This test can be carried out only if the counter is equipped with one of

the optional oscillators, PM9691 or PM9692.

– Be sure the jumpers J23 and J25 are in the OPT position, (see

Fig. 5-4).

– Check that 10 MHz is present at U29, pin 42.

– Check that 10 MHz is present at the rear panel connector

10 MHz OUT (J27).

These oscillators cannot be repaired in a local workshop. They must

be sent to the factory for repair.

Microcontroller

– Check that 6 MHz is present at U11, pin 65 (see Fig.5-3).

– Check that the RESET circuit U10 works properly by moving

the RESET jumper J29 temporarily to the ON position.

If the CPU is not running, check the state of the pins J11-J13. See ta-

ble below.

If you find any fault, continue with traditional troubleshooting tech-

niques and replace defective circuits. Also refer to Chapter 4, Circuit

Descriptions.

NOTE: Check that activity is going on at U11 pin 62 (ALE), pin

61 (RD), pin 63 (INST), and pin 43 (READY). These

pins should not be stuck HIGH or LOW.

– If one or more bits on the AD-bus are corrupt, themicrocontroller (C) often reads the same instructions re-peatedly. When the C discovers an invalid OP code, it will

RESET itself and start from the beginning again. The Csets the RESET input low when it resets itself. This can bediscovered at the RESET input of U11, (pin 16). If +5 V toU10 is OK, this could be the cause of trouble.

5-6 Troubleshooting

U11

J11

J1

2

J1

3J1

4

J29J30

10 27

44

161

Stand

C11B2

Optio

14

1

B1

U2

3

U17U16

U2

2U

13

U1

4

Fig. 5-3 Test points and jumpers for checking the

microcontroller.

r

e

U29

Standard oscillator

C115B2

J24

Optional OCXO

Optional oscillator

J23 J25

31

811

51

1U

23

Coarse adjust

Fine adjust

J27

Fig 5-4 Trimmers for the reference frequency oscillators.

Display JP11, J12,

J13

Message Error Action

0.1 0, 0, 1 - C I/O port

error

Replace U11

0.1.2 0, 1, 0 Err UC C internal

RAM error

Replace U11

0.1.2.3 0, 1, 1 Err UC C timer er-

ror

Replace U11

0.1.2.3.4 1, 0, 0 Err rA RAM error Replace U22

0.1.2.3.4.5 1, 0, 1 Err ASIC ASIC error Replace U29

All seg-

ments

1, 1, 0

1, 1, 1 Err rA GPIB RAM

error

Replace U111 on

GPIB board

Test OK

Table 5-8 Start-up test.

Page 39: Programmable Frequency Counter

Input Amplifier

A Input Check

DC levels

– Switch on the counter.

– Press LOCAL/PRESET and ENTER.

– Deselect AUTO and set the sensitivity to 1 Vrms.

– Measure the DC voltages according to Fig. 5-5. Use the DMM

with a 10 k resistor in series with the test cable.

AC levels

– Connect a 1000 Hz sine wave signal with an amplitude of

1 Vpp to Input A.

– Measure the AC-levels according to Fig. 5-5. Use the oscillo-

scope and a 10 M probe.

If you find any fault, continue with traditional troubleshooting tech-

niques and replace defective circuits. Also refer to Input Amplifiers

A and B in Chapter 4, Circuit Descriptions.

Troubleshooting 5-7

TP27, -1.4V

U8

Q1

Q3

Q4U1

U9

Q130V

0.3Vpp1.5V

0.6Vpp

0.6Vpp

0.8V

7V

0V0.6Vpp

1Vpp

4.3V

0.8V

0.4V

-3V

-2.3V

Q2

TP26, -1.4V

TP11

TP10

2V

-2V

D4

D3

D1 D2

-1.7V -0.9V

R23

R31R33

R91

R22

C1

C2

Fig. 5-5 Typical voltages, input amplifier.

Page 40: Programmable Frequency Counter

Prescaler 3.0 GHz, PM9624

See Chapter 2, Performance Check, for verification.

This prescaler cannot be repaired in a local workshop. It must be sent

to your Fluke representative for repair.

GPIB Interface and Analog Output

General Remark

If the GPIB board is suspected to be faulty, be sure the basic instru-

ment is OK by performing a few functional checks after the ribbon

cable has been disconnected from J18.

Analog Output

The microcontroller generates a PWM signal that is applied to pin 1

on U101. The frequency is approximately 20 Hz, but the duty cycle is

dependent on several factors like the frequency of the measured sig-

nal, the measurement time, and the selected scaling factor.

The PWM signal is converted to a DC voltage between 0 V and

4.98 V by integration, first in a passive RC network (R101, C103,

R102, C102 and then in an active integrator U103.

Setup

– Connect the counter to line power.

– Switch on the counter.

– Press PRESET and then ENTER.

– Connect a DMM to the BNC output BU102.

– Activate the analog output.

– Select AUX MENU.

– Press DATA ENTRY / until the display reads ANA-LOG OUT.

– Press ENTER

– Press DATA ENTRY / to select ON.

– Press ENTER.

– Press DATA ENTRY / until the display reads 1.0-3

V.

– Press ENTER.

– Connect a LF synthesizer to Input A on the counter.

– Set the synthesizer to 500 Hz, 1 VPP

– Read the DMM result. The voltage should be 2.49 V ± 35 mV.

Minor deviations can depend on the settings of the trimmer potenti-

ometers for ZERO and FULL SCALE. See Chapter 6, Calibration

Adjustments, for a decription of the procedure to follow.

Large deviations indicate a fault. Trace the signal through the inte-

gration chain with traditional troubleshooting techniques and replace

defective circuits. The duty cycle at U101:1 should be 50 %. Also re-

fer to GPIB Interface Including Analog Output in Chapter 4, Circuit

Descriptions.

Bus Interface

A simple method to check the most fundamental functions of the in-

terface is to send the standardized query message *IDN? and check

the response string.

Setup

– Make sure you have access to a PC with GPIB capability.

– Check that there is a program installed that can send simple

commands entered via the keyboard and that can receive and

display the response strings.

– Connect the GPIB connectors of the counter and the PC by

means of a standard GPIB cable.

– Set the address switches on the counter (the five rightmost

ones seen from the rear) so that their binary weight corre-

sponds to the wanted decimal value between 0 and 30.

– Send the command *IDN? to the counter and observe the re-

sponse string. See the programming manual for more

information on the response format and contents.

– You can also try the command *OPT? to get a listing of in-stalled options (except OCXO).

If you find a fault, continue with traditional troubleshooting tech-niques and replace defective circuits. Try to exercise the address/data

bus by writing small program loops. Look for stuck nodes with an

oscilloscope.

5-8 Troubleshooting

0

Sensitivity

-10 dBm

-20 dBm

-30 dBm

-40 dBm

-50 dBm1 GHz 2 GHz 2.5 GHz

Frequency

Fig. 5-6 Specified and typical sensitivity of input C(PM9624).

U109

U101U106

BU

101

U103Zero

GPIB

BU102BU103

Full Scale

U1

07

U1

11

U1

08

U113

U116

U117

U114 U115

Fig. 5-7 Component layout, GPIB interface.

Page 41: Programmable Frequency Counter

Safety Inspection and Test After Repair

General Directives

After repair in the primary circuits, make sure that you have not re-

duced the creepage distances and clearances.

Before soldering, bend component pins on the solder side of the

board. Replace insulating guards and plates.

Safety Components

Components in the primary circuits are important to the safety of the

instrument and may be replaced only by components obtained from

your local Fluke representative.

Checking the Protective GroundConnection

Visually Check the correct connection and condition and measure

the resistance between the protective lead at the plug and the cabinet.

The resistance must not be more than 0.5 . During measurement,

the power cord should be moved. Any variations in resistance show a

defect.

Safety Inspection and Test After Repair 5-9

Page 42: Programmable Frequency Counter

This page is intentionally left blank.

5-10 Safety Inspection and Test After Repair

Page 43: Programmable Frequency Counter

Chapter 6

Calibration

Adjustments

Page 44: Programmable Frequency Counter

Introduction

Required Test Equipment

* For adjustment of PM9691 and PM9692 Oven Oscillators only.

Note: Only calibrated instruments should be used.

Preparation

WARNING: Live parts and accessible terminals which

can be dangerous to life are always exposed inside

the unit when it is connected to line power. Use ex-treme caution when handling, testing, or adjusting

the counter.

Before beginning the calibration adjustments, power up the instru-ment and leave it on for at least 30 minutes to let it reach normal oper-ating temperature.

Power Supply

CAUTION: If you adjust the +5 V trimmer you have toadjust the complete instrument.

Setup

– Remove the protective cover above the power module.

WARNING: The heat sink inside the power module is

connected to line power.

– Connect the counter to line power.

– Switch on the counter.

– Press PRESET, then press ENTER.

NOTE: The backlight must be switched on during the adjust-

ment of the power module.

Adjustment

– Connect the DMM to test point TP15 = +5V and GND, (see

Fig. 6-2).

– Adjust the +5V trim potentiometer inside the power module

until the DMM reads +5.10 ± 0.01 V.

– Check that the voltage between the test point TP23 = +5 V and

GND is +5.06 ± 0.03 V.

– Check that the unregulated voltage from the power module at

test point TP16 = +15 V is about +18 V.

– Check that the unregulated voltage from the power module at

test point TP17 = –7 V is about –8 V.

– Reinstall the protective cover onto the power module.

6-2 Introduction

Power

Module

Fuse

TP23, +5

TP20, -5.2

TP22, +7

J10

J9J4

J3

+5V adjust

6 14

1 5

TP21,+12V

TP15, +5TP17, -7

J15

TP16, +15

LoadDis

co

nn

ecte

d

Con

ne

cted

J21

J16

Fig. 6-1 Test points and trimmer for the Power Supply.

Type Performance

DMM Acc. 0.02% / Res. 1V

HF synthesizer 3300 MHz

Pulse generator 125 MHz / 2 ns rise/fall time

LF synthesizer 50 MHz / 20 Vpp

Oscilloscope 300 MHz / 2-channel

Passive probe 10:1, preferably 500 (or well

compensated 10 M

FET probe 300 MHz

Power supply 12 V / 2 A

Power splitter 50 / 4W

Feed-through termination 50

10 MHz reference 1x10-7

10 MHz reference 1x10-9

*

BNC-BNC cables Different lengths

Screwdrivers Torx 10 & 20

Table 6-1 Required test equipment.

Page 45: Programmable Frequency Counter

Input AmplifierThe instructions in this section are consecutive. Do not change a set-ting until you are told to do so, either in the text or in the tables.

Setup

– Remove the screen shield before performing any adjustments

in the input amplifier.

– Connect the counter to line power.

– Switch on the counter.

– Press PRESET, then press ENTER.

Offset

– Connect the DMM to Pin 10 of U8 and GND = screen, see

Fig. 6-2. Pin 1 is marked in the figure and is the middle pin onthe side closest to the rear of the unit. Alternatively you can

use one of the soldering pads of resistor R114 as a test pad, as

it is connected to Pin 10. This resistor is normally not

mounted.

– Adjust R33 = OFFSET A until the DMM reads 0.0 ±0.2 mV.

Linearity

Setup

– Press the Waveform Key once. (This step puts the instrument

into the correct mode so that it switches from x1 Attenuator to

x11 Attenuator when the sensitivity is adjusted above 2.8V.)

– Connect the pulse generator to the A input of the counter via

the power splitter.

– Connect the other output from the power splitter to channel A

of the oscilloscope.

NOTE: The Pulse Generator with 50 ohm output impedance

should be set to 5 Vpp when loaded in 50 , so that the

level recorded at the CRO A channel (equal to the in-

put to the DUT) is 2.5 Vpp, after going through the split-

ter.

NOTE: If you are using a 10 M x10 CRO probe, ensure that

its compensation has been correctly adjusted, so that

incorrect observations of undershoots/overshoots are

not made.

– Use the probe to connect channel B of the oscilloscope to

Pin 10 of U8 .

– Adjust R31 = LIN A until both signals look as alike as possi-

ble.

NOTE: The AC coupling will give the curve a slight tilt.

x1 Attenuator

Setup

– Adjust C2 = X1 until both signals on the screen look as alike

as possible, without any overshoots or undershoots. The level

displayed on the CRO B channel for Pin 10 of U8 is approxi-

mately 1.2 Vpp.

x11 Attenuator

Setup

– Adjust C1 = X11 until both signals on the screen look as alike

as possible, without any overshoots or undershoots.

Input Amplifier 6-3

Off set A (R33)

Z E R O A DJ. COMP I

L i n A (R31)

X11 (C1)

X 1 (C2)

TP10, T R IG L E VE L COMP I

TP11, TRIG LEVEL COMP

Z E R O A DJ . COMP I I

TP27

1

13

, S E NS E

S ense A dj .

TP26, SENSEJ2 U8

Fig. 6-2 Test points and trimmers for the Input amplifiers.

PM6685 Input A 50

Sensitivity Any level below 1 Vrms

Pulse generator Amplitude 5 Vpp in 50

Period 2 ms, symmetrical

Oscilloscope Time 200 s/div

Setting: A 0.5 V/div, 50 , DC

Setting: B 20 mV/div, 10:1 probe, DC

Table 6-2

PM6685 Impedance 50

Sensitivity Any level below 1 Vrms

Pulse generator Amplitude 5 Vpp in 50

Period 100 s, symmetrical

Oscilloscope Time 10 s/div

Setting: A 0.5 V/div, 50 , DC

Setting: B 20 mV/div, 10:1 probe, DC

Table 6-3

PM6685 Impedance 50

Sensitivity Any level above 2.8 Vrms

Pulse generator Amplitude 5 Vpp

Period 100 s, symmetrical

Oscilloscope Time 10 s/div

Setting: A 0.5 V/div, 50 , DC

Setting: B 5 mV/div, 10:1 probe, DC

Table 6-4

Page 46: Programmable Frequency Counter

– Observe that the level displayed on the CRO B channel for

Pin 10 of U8 is now approximately 120 mVpp, indicating that

the x11 Attenuator has been selected.

Trigger Levels

Setup

– Disconnect all input signals to the counter.

Zero levels

Channel A

– Connect the DMM to test points TP10 = TRIG LEVEL

COMP I and GND = screen.

– Adjust R69 = ZERO ADJ COMP. I until the DMM reads

+0.95 ± 0.05 mV.

– Connect the DMM to test points TP11 = TRIG LEVEL

COMP II and GND=screen.

– Adjust R70 = ZERO ADJ COMP. II until the DMM reads

–0.95 ± 0.05 mV.

Sensitivity

Setup

– Measure the DC voltage between test points TP26="–" and

TP27="+", (see Fig. 6-2).

– Adjust R91 = SENSE until the DMM reads 10 ± 0.2 mV.

Offset

Setup

– Connect the Signal generator to the A input of the counter.

– Press NULL on the counter.

– Decrease the amlitude from the signal generator to

–28 dBm.

– Adjust R33 = OFFSET A until the counter reads < ±100 Hz.

– If this is not possible, adjust R91= SENSE until the counter

reads < ±100 Hz.

NOTE: Reinstall the screen shield after making these adjust-ments.

Reference Oscillators

NOTE: The standard oscillator is always mounted in the unit,

even if an optional oscillator is installed. You set the

jumpers J23 and J25 to select the timebase source

that you want to use.

Standard Oscillator

Setup

– Connect the counter to line power.

– Switch on the counter.

– Press PRESET, then press ENTER.

– Connect the 10 MHz reference to the A input of the counter.

– Press CHECK, NULL, and CHECK again.

The adjustment should preferably be made at an ambient tempera-

ture of +23 C.

Adjustment

– Adjust C115 = STD OSC ADJ, until the counter reads

10 MHz 5 Hz.

NOTE: Move the two jumpers J23 and J25 back to position

OPT if an optional oscillator is installed.

6-4 Reference Oscillators

PM6685 Impedance 50

Sensitivity 10 mVrms

Signal generator Amplitude –18 dBm

Frequency 50 MHz

Table 6-5

PM6685 Impedance 50

Sensitivity 10 mVrms

Table 6-6

r

e

U29

Standard oscillator

C115B2

J24

Optional OCXO

Optional oscillator

J23 J25

31

811

51

1U

23

Coarse adjust

Fine adjust

J27

Fig. 6-3 Trimmers for the reference oscillator frequency.

Page 47: Programmable Frequency Counter

Oven-Controlled Oscillators (OCXO),PM9691 & PM9692

PM9691 is adjusted to 10 MHz ± 0.2 Hz when manufactured,

PM9692 to 10 MHz ± 0.05 Hz, so there is no need to adjust the fre-

quency directly after installation.

These oscillators, like any oscillator, change frequency because of

aging. Use the table in the User’s Handbook, Chapter 11, to calculate

when calibration is due. The complete specifications can be found in

the same manual, Chapter 12.

Required test equipment

Setup

– Connect the counter to the line power.

– Switch on the counter.

– Set the counter to default settings (preset).

Make the adjustment at an ambient temperature of +23 °C, if possi-

ble. The oscillator must have been operating continuously for 48

hours before an adjustment.

– Connect the 10 MHz OUT socket of the counter to be adjusted

(rear panel) to the Input A of the PM6681R/PM6685R.

– Set up the PM6681R/PM6685R:

– Measuring time = 0.5 s

– 50 input impedance

– Frequency A measurements

Adjustment

The oscillator has a voltage controlled adjustment range. This range

is divided into five fixed steps set via DIP switches, and a trimmer to

fine tune the control voltage.

Normally the range of the trimmer should be sufficient to compen-

sate for the aging that occurs during at least two years of operation.

Fine adjustment

– Adjust the trimmer to better than 10 MHz ± 0.2 Hz (PM9691)

or 10 MHz ± 0.05 Hz (PM9692), i.e. ±20 resp. ±5 in the last

two digits on the PM6681R/PM6685R display.

– If this adjustment is OK, reassemble the counter.

Coarse adjustment

Make this adjustment only if the trimmer range is insufficient to ad-

just the oscillator.

– Remove the tape from the DIP-switch.

– Adjust the trimmer to its mid position (about 12 turns from ei-

ther end position).

Read the frequency on the PM6681R/PM6685R.

(Nominal 10.000000 MHz).

– If the frequency is too low, set the DIP-switches to the nexthigher voltage range.

– If the frequency is too high, set the DIP-switches to thenext lower voltage range.

NOTE: There are also oscillators that do not have DIP

switches. If this is the case, then the trimmer potenti-ometer alone covers the whole adjustment range.

Reference Oscillators 6-5

Fig. 6-4 Adjusting the optional oscillator frequency.

Connector

Trimmer for fine tuning

Switches for coarse adj.

Instrument Required specification Model

Counter with RubidiumReference

10 MHz ± 0.01 Hz (Uncer-tainty 1x10

-9)

PM6681R orPM6685R

Table 6-7

Trimmer range (V) DIP switch number (1 = on, 0 = off)

1 2 3 4 5 6 7 8

2.6 - 3.4 0 0 0 1 0 0 0 0

3.2 - 3.9 0 1 0 1 1 0 0 0

3.5 - 4.3 1 0 0 1 1 0 0 0

4.0 - 4.7 1 0 1 1 1 1 0 0

4.1 - 5.0 1 0 1 0 1 1 1 0

Table 6-8

Page 48: Programmable Frequency Counter

Other Options

HF Input 3.0 GHz , PM9624

NOTE: Before beginning any adjustments, the HF input must

have been in operation for at least one minute to let it

reach normal operating temperature.

Setup

– Connect the counter to line power.

– Switch on the counter.

– Press PRESET, then press ENTER.

– Connect the signal generator to the HF input.

Adjustment

– Turn the potentiometer R61, (see Fig. 6-5) fully counterclock-

wise.

– Check that the GATE indicator stops blinking.

– Turn R61 slowly clockwise until the GATE indicator starts

blinking.

The input frequency, 800 ± 25 MHz, will now be displayed.

To verify the 3.0 GHz HF input, a sweep frequency synthesizer is

needed. Also refer to Chapter 2 - Performance Check: Options,

Prescaler.

GPIB Interface, PM9626B

Setup

– Connect the counter to line power.

– Switch on the counter.

– Press PRESET, then press ENTER.

– Connect the DMM to the BNC output of the analog output.

– Activate the analog output.

– Select AUX MENU.

– Press DATA ENTRY UP/DOWN keys until the displayreads ANALOG OUT.

– Press ENTER.

– Press DATA ENTRY UP/DOWN keys to select ON.

– Press ENTER.

– Press DATA ENTRY UP/DOWN keys to until the displayreads 1.0-3 V.

– Press ENTER.

– Connect the LF synthesizer to the A input of the counter.

The counter should read 1000.0xxxxx Hz.

Adjustment

– Adjust the trimmer ZERO (see Fig. 6-6) until the output volt-

age is 0 V ± 1 mV.

– Set the LF synthesizer to 999.90 Hz / 1 Vpp square wave.

The counter should read 999.9xxxxx Hz.

– Adjust the trimmer FULL SCALE (see figure 6-6) until the

output voltage is 4.980 V ± 3 mV.

– Set the LF synthesizr to 100.01 Hz / 1 Vpp square wave.

The counter should read 100.0xxxxxx Hz.

– Check that the output voltage is 500 mV ± 5 mV.

6-6 Other Options

PM6685 Function FREQ C

Signal gener-ator

Frequency 800 ± 25 MHz

Amplitude 5.9 ± 0.5 mVrms

Table 6-9

HF

inp

ut

J1

9

R61

TP1TP9

Fig. 6-5 Test points and trimmers for the 3.0 GHz HFinput.

U109

U101U106

BU

101

U103Zero

GPIB

BU102BU103

Full Scale

U1

07

U1

11

U1

08

U113

U116

U117

U114 U115

Fig. 6-6 Trimmers for the GPIB interface.

PM6685 Input A 50 / AC / Manual trigger levels

LF synthe-

sizer

Amplitude 1 Vpp

Period 1000.01 Hz square wave

Table 6-10

Page 49: Programmable Frequency Counter

Chapter 7

Replacement Parts

Page 50: Programmable Frequency Counter

Introduction

7.2 Replacement Parts, Introduction

Standard Parts

Electrical and mechanical replacement parts can be obtained through

your local Fluke organization or representative. However, many of the

standard components can be obtained from other local suppliers. Before

purchasing or ordering replacement parts, check the parts list for part

number, value, tolerance, rating, and description.

If the value of the physical component differs from what is described in

the parts list, you should always replace the part with the same value as

originally mounted.

Standard parts are unmarked or marked with an ‘S’ in the column of

the parts lists.

Special Parts

In addition to standard electronic components, the following special

components are used:

– Components that are manufactured or selected by the manufac-turer to meet specific performance requirements.

– Components that are important for the safety of the instrument.

Both types of components may be replaced only by components ob-

tained through your local Fluke organization.

NOTE: Physical size and shape of a component may af-fect the performance of the instrument, particularly at

high frequencies. Always use direct replacements un-less it is known that a substitute will not degrade the

performance of the instrument.

These parts are ‘Recommended Replacement Parts’ and are marked

with an ‘R’ in the column of the parts lists.

Components marked with a ‘P’ in the column are ‘Production items’

not kept in replacement parts stock. These items can be ordered, but the

delivery time is longer than for normal replacement parts.

Page 51: Programmable Frequency Counter

Mechanical Parts

Pos Description Part Number P

PCA 1, Main board 4031 100 65420 P

PCA 2, Front board 4031 100 48250 P

13 Stand-off, plastic 5322 532 12746 R

18 Textplate kit 4031 100 62430 R

20 Rubber keypad 4031 100 62720 R

22 Cover and Front panel 4031 100 49570 R

25 Rear panel 5322 447 31085 P

34 Profile-support 5322 460 60542 P

35 Profile-support 4031 100 53210 P

38 Shield cover 5322 447 91931 P

39 Shield cover 5322 462 50459 P

50 Rearfoot, cabinet, m-90 5322 462 41719 R

52 Bottom foot, cabinet, m-90 5322 462 41554 R

53 Bracket, cabinet 5322 401 11422 R

54 Spring, cabinet 5322 492 63808 R

Pos Description Part Number P

56 Rubber foot, sj-5018 black 5322 462 44434 R

58 Tilting support 5322 401 11471 R

62 Coax connector 5322 267 10004 S

63 Coax connector 5322 265 10264 R

64 Soldering tag, 9.6X15/15 ms fs 5322 290 30318 S

67 Toroid core 30nh rcc9/6/3 4c65 violet 5322 526 10545 P

68 Bottom shield 5322 447 91829 P

70 BNC holder 4031 100 48830 P

84 Mains filter 1a fs3514-1/07 5322 121 42352 R

90 PCA guide for prescaler 5322 401 11347 P

92 Stand-off nut M3x14 4031 100 48800 P

100 Washer, 4.0X10x2 pa6-6 5322 532 52364 P

102 Washer, 9.5X13x2.3 4822 532 10222 P

104 BNC plate, 25.4X25.4 5322 466 82868 P

110 Insulate plate 5322 466 61932 P

122 Shielding strip 610mm 99-210self-adhesive

5322 466 62077 P

150 Screw, mrt-kombi 3x06, stfz 4822 502 11658 P

152 Screw, mrt-kombi 3x08, stfz 5322 502 21489 P

156 Screw, mrt-kombi 4x16, stfz 5322 502 21491 P

160 Screw, mft-tt 3x08 stfzb tx 4822 502 11713 P

Replacement Parts, Mechanical Parts 7-3

Page 52: Programmable Frequency Counter

Pos Description Part Number P

161 Screw, mfx-tt 3x08 st fz poz 4822 502 11713 P

164 Screw, mft-tt 4x12 stfzb tx 5322 502 13553 P

166 Screw, mrt-tt 3x08 stfzb tx 4822 502 11691 P

168 Screw, mrt-tt 4x16 stfzb tx 5322 502 13552 P

172 Screw, mft 4x10 st fzb, tx 5322 502 13641 P

176 Screw, rtk-ko st3.5X10 stfz 5322 502 30703 P

180 Spring washer, kba 3.2 St fz din137 4822 530 80173 P

Pos Description Part Number P

182 Spring washer, kba 4.3 St fz din137 4822 530 80076 P

184 Lock washer, yt4.3 St fz din6798a 4822 530 80083 P

190 Nut, m6m 04 st fzb 4822 505 10326 P

200 Receptacle, 140825-2, 2.8X0.8 5322 268 10275 P

201 Protect sleeve 2.8mm N 94610 transppa

5322 321 40117 P

202 Cable clip, reel srb-2.5T-m4 5322 358 50107 P

7-4 Replacement Parts, Mechanical Parts

Page 53: Programmable Frequency Counter

Replacement Parts, Mechanical Parts 7-5

80

Lug bent 15° to lock

Page 54: Programmable Frequency Counter

Main Board

Pos Description Part No.

227 CHOKE 4S2 3.5X6MM BANDAD 80ohm at 100MHz 5322 157 61928 S

B1 CRYSTAL 12.000 MHz SMD MA-406 2422 543 01353 P

B2 CRYSTAL 10 MHz HC-49U/13 5322 242 82118 P

C1 CAPACITOR-TRIM 0.5-2 pF 300V 5322 124 80335 S

C10 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C100 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C101 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C102 CAPACITOR 33 pF 5% 50V NP0 0805 2222 861 15339 S

C103 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C104 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C105 CAPACITOR 6.80 UF 20% 16V 6.0X3.2 MOLD 5322 124 10687 R

C106 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C107 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C108 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C109 CAPACITOR 22 pF 5% 50V NP0 0805 5322 122 32658 S

C11 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C110 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C111 CAPACITOR 15 UF 20%6.3V 6.0X3.2 MOLD 5322 124 11418 S

C112 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C113 CAPACITOR 82 pF 5% 50V NP0 0805 2222 861 15829 S

C114 CAPACITOR 100 pF 5% 50V NP0 0805 2222 861 15101 S

C115 CAPACITOR-TRIM 3-10 pF TZBX4Z100BB110 5322 125 50306 R

C116 CAPACITOR 47 pF 5% 50V NP0 0805 2222 861 15479 S

C117 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C118 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C119 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C12 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C120 CAPACITOR 10 pF 5% 50V NP0 0805 2222 861 15109 S

C121 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C122 CAPACITOR 680 pF 20% 63V NP0 1206 4822 126 12075 S

C123 CAPACITOR 47 pF 5% 50V NP0 0805 2222 861 15479 S

C124 CAPACITOR 100nF 20% 25V X7R 0805 5322 126 13638 S

C125 CAPACITOR 2.20 UF 20% 6.3V 3.2X1.6 MOLD 5322 124 10685 S

C126 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C127 CAPACITOR 1 nF 20% 50V X7R 0805 5322 122 34123 S

C128 CAPACITOR 82 pF 5% 50V NP0 0805 2222 861 15829 S

C129 CAPACITOR 6.8 pF 5% 50V NP0 0805 2222 861 15688 S

C13 CAPACITOR 47 pF 5% 50V NP0 0805 2222 861 15479 S

C130 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C131 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C132 CAPACITOR 2.20 UF 20% 6.3V 3.2X1.6 MOLD 5322 124 10685 S

C133 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C134 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C135 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C136 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C138 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C139 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C14 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C140 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C141 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C142 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C143 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C145 CAPACITOR 390 pF 5% 50V NP0 0805 4822 122 32636 S

C146 CAPACITOR 10 pF 5% 50V NP0 0805 2222 861 15109 S

C148 CAPACITOR 470 pF 1% 63V NP0 0805 5322 126 14051 S

C149 CAPACITOR 22 pF 5% 50V NP0 0805 5322 122 32658 S

C15 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C150 CAPACITOR 390 pF 5% 50V NP0 0805 4822 122 32636 S

C151 CAPACITOR 10 pF 5% 50V NP0 0805 2222 861 15109 S

C153 CAPACITOR 470 pF 1% 63V NP0 0805 5322 126 14051 S

C154 CAPACITOR 22 pF 5% 50V NP0 0805 5322 122 32658 S

Pos Description Part No.

C155 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C156 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C157 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C158 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C159 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C16 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C160 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C161 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C162 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C163 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C164 CAPACITOR 2.20 UF 20%6.3V 3.2X1.6 MOLD 5322 124 10685 S

C165 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C166 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C167 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C168 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C169 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C17 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C170 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C171 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C172 CAPACITOR 2.20 UF 20% 6.3V 3.2X1.6 MOLD 5322 124 10685 S

C173 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C174 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C175 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C176 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C177 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C178 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C179 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C18 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C180 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C181 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C182 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C183 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C184 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C185 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C186 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C19 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C2 CAPACITOR-TRIM 2.0-18 pF 300V 2222 809 05217 R

C20 CAPACITOR 1 nF 20% 50V X7R 0805 5322 122 34123 S

C21 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C22 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C23 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C24 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C25 CAPACITOR 10 pF 5% 50V NP0 0805 2222 861 15109 S

C26 CAPACITOR 10 pF 5% 50V NP0 0805 2222 861 15109 S

C27 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C28 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C29 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C3 CAPACITOR 22 nF 10% 200V X7R 1206 5322 126 14081 R

C30 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C31 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C32 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C33 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C34 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C35 CAPACITOR 470 nF 10% 25V X7R 1210 4822 126 12549 S

C36 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C37 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C38 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C39 CAPACITOR 6.80 UF 20% 16V 6.0X3.2 MOLD 5322 124 10687 R

C4 CAPACITOR 3.3 pF ±0.25pF 50V NP0 0805 2222 861 15338 S

C40 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C41 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

7-6 Replacement Parts, Main Board

Page 55: Programmable Frequency Counter

Pos Description Part No.

C42 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C43 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C44 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C45 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C46 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C47 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C48 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C49 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C5 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C50 CAPACITOR 2.20 UF 20% 6.3V 3.2X1.6 MOLD 5322 124 10685 S

C51 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C52 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C53 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C54 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C55 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C56 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C57 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C58 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C59 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C6 CAPACITOR 1 nF 20% 50V X7R 0805 5322 122 34123 S

C60 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C61 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C62 CAPACITOR 2.20 nF PME289MA4220MR04 5322 121 43756 S

C63 CAPACITOR 2.20 nF PME289MA4220MR04 5322 121 43756 S

C64 CAPACITOR 270 µF 20% SMG 400V 25X45 5322 124 80334 S

C65 CAPACITOR 100 nF 20% 250V 2222 336 20104 S

C66 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C67 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C68 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C69 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C7 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C70 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C71 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C72 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C73 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C74 CAPACITOR 68 µF 20% 6.3V SOLID AL 5322 124 10455 S

C75 CAPACITOR 33 µF 20% 63V RADIAL 2M 6.3x11 2222 037 90074 S

C76 CAPACITOR 33 µF 20% 63V RADIAL 2M 6.3x11 2222 037 90074 S

C77 CAPACITOR 10 pF 5% 50V NP0 0805 2222 861 15109 S

C78 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C79 CAPACITOR 33 µF 20% 63V RADIAL 2M 6.3x11 2222 037 90074 S

C8 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C80 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C81 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C82 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C83 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C85 CAPACITOR 22 pF 5% 50V NP0 0805 5322 122 32658 S

C86 CAPACITOR 22 pF 5% 50V NP0 0805 5322 122 32658 S

C87 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C88 CAPACITOR 2.20 UF 20% 6.3V 3.2X1.6 MOLD 5322 124 10685 S

C89 CAPACITOR 100 pF 5% 50V NP0 0805 2222 861 15101 S

C9 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C90 CAPACITOR 100 pF 5% 50V NP0 0805 2222 861 15101 S

C91 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C92 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C93 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C94 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C95 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C96 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C97 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C98 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C99 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

D1 DIODE 0.10A BAT18 35V 1PF SOT23 5322 130 32076 S

D10 DIODE 1A SB140 40V DO41 5322 130 81917 S

Pos Description Part No.

D12 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D13 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D14 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D15 DIODE BYD17G 400V 1.5A SOD87 9338 122 40701 R

D16 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D17 DIODE BYD17G 400V 1.5A SOD87 9338 122 40701 R

D18 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D19 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D2 DIODE 0.10A BAT18 35V 1PF SOT23 5322 130 32076 S

D21 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D22 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D23 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D24 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D25 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D26 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D3 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D4 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D5 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D6 DIODE 1A 1N4003/200 DO41 4822 130 31878 S

D7 DIODE 1A SB140 40V DO41 5322 130 81917 S

D8 DIODE 1A SB140 40V DO41 5322 130 81917 S

D9 BRIDGE RECTIFIER 2KBP08 2A 800V 5322 130 50474 S

F1 FUSE HOLDER 011 656 5X20mm 4822 256 30139 S

F1 FUSE 1.6A 5X20 T FST034.3119 4822 253 30024 S

J1 SOLDERING LUG 10.0X15/21 CU SN 4031 100 58390 P

J1 CONNECTOR-COAX BNC 5322 267 10004 S

J10 FLAT PIN 2.8mm E184/8 LESA SN BAND 5322 290 34064 S

J15 CONNECTOR 2 POL F095 SINGLE ROW 5322 265 44074 S

J15 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J16 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J16 CONNECTOR 3 POL F095 SINGLE ROW 5322 290 60445 S

J17 CABLE ASSY 5322 321 60669 R

J18 CONNECTOR 40 POL LOW PROFILE HEADER 5322 265 41051 S

J19 CONNECTOR 16 POL TMH-108-01-L-DW 5322 265 41013 S

J21 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J21 CONNECTOR 3 POL F095 SINGLE ROW 5322 290 60445 S

J22 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J22 CONNECTOR 3 POL F095 SINGLE ROW 5322 290 60445 S

J23 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J23 CONNECTOR 3 POL F095 SINGLE ROW 5322 290 60445 S

J24 CONNECTOR 10 POL 22-03-2101 4030-10A 5322 265 64028 S

J25 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J25 CONNECTOR 3 POL F095 SINGLE ROW 5322 290 60445 S

J29 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J29 CONNECTOR 3 POL F095 SINGLE ROW 5322 290 60445 S

J3 FLAT PIN 2.8mm E184/8 LESA SN BAND 5322 290 34064 S

J30 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J30 CONNECTOR 3 POL F095 SINGLE ROW 5322 290 60445 S

J32 CONNECTOR 20 POL LOW PROFILE HEADER 5322 265 51296 S

J4 FLAT PIN 2.8mm E184/8 LESA SN BAND 5322 290 34064 S

J5 FLAT PIN 2.8mm E184/8 LESA SN BAND 5322 290 34064 S

J6 FLAT PIN 2.8mm E184/8 LESA SN BAND 5322 290 34064 S

J7 CONNECTOR 2 POL F095 SINGLE ROW 5322 265 44074 S

J9 FLAT PIN 2.8mm E184/8 LESA SN BAND 5322 290 34064 S

K1 RELAY REED 5V PRMA-15157-3790 5322 280 20489 R

K2 RELAY REED 5V PRMA-15157-3790 5322 280 20489 R

K3 RELAY REED 5V PRMA-15157-3790 5322 280 20489 R

K4 RELAY TQ2-5 SV/1A 2pol vx 14X9X5m 5322 280 20514 R

K5 RELAY 2p vx V23042-A1003-B101 (alt.A2303) 5322 280 60557 R

L1 CHOKE 220 UH 10% NL453232T-221K 5322 157 61918 S

L10 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

L11 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

Replacement Parts, Main Board 7-7

Page 56: Programmable Frequency Counter

Pos Description Part No.

L12 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

L13 CHOKE 4.70µH 5% LQH1N4R7J 2422 535 94048 P

L14 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

L15 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

L16 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

L17 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

L18 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

L19 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

L2 CHOKE 4S2 3.5X6MM BANDAD 80ohm at 100MHz 5322 157 61928 P

L20 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

L21 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

L22 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

L23 CHOKE 4S2 3.5X6MM BANDAD 80ohm at 100MHz 5322 157 61928 P

L24 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

L25 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

L3 CHOKE 4S2 3.5X6MM BANDAD 80ohm at 100MHz 5322 157 61928 S

L4 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

L5 CHOKE 4S2 3.5X6MM BANDAD 80ohm at 100MHz 5322 157 61928 S

L6 CHOKE 10mH B82722-J2102-N1 1A 5322 157 70143 S

L7 CHOKE 10.00µH NEWPORT 18R103 2422 536 00061 P

L8 CHOKE 10.00µH NEWPORT 18R103 2422 536 00061 P

L9 CHOKE 33µH TSL0809-330K1R2 5322 157 53568 S

Q1 TRANSISTOR BF513 .03A20V SOT23 4822 130 60686 S

Q10 TRANSISTOR 0.5A BC807-25 45V SOT23 5322 130 60845 S

Q11 TRANSISTOR 0.5A BC817-25 45V SOT23 4822 130 42804 S

Q12 TRANSISTOR BC847B .1A45V SOT23 4822 130 60511 S

Q13 TRANSISTOR BFG97 0.1A 15V SO223 4822 130 63069 S

Q14 TRANSISTOR BC847B .1A45V SOT23 4822 130 60511 S

Q15 TRANSISTOR BC857B .1A45V SOT23 5322 130 60508 S

Q16 TRANSISTOR BC847B .1A45V SOT23 4822 130 60511 S

Q17 TRANSISTOR 0.5A BC817-25 45V SOT23 4822 130 42804 S

Q2 TRANSISTOR 25 MA BFR92A 20V SOT23 5322 130 60647 S

Q24 TRANSI-NPN SMD BFG16A SOT223 1.5GHz 1W 9340 022 10701 R

Q27 TRANSI-NPN SMD BFG16A SOT223 1.5GHz 1W 9340 022 10701 R

Q28 TRANSISTOR BFT92 25MA 15V SOT23 5322 130 44711 S

Q29 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q3 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q30 TRANSISTOR BFT92 25MA 15V SOT23 5322 130 44711 S

Q31 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q32 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q33 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q34 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q35 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q36 TRANSISTOR BSR12 0.1A 15V SOT23 5322 130 44743 S

Q37 TRANSISTOR BSR12 0.1A 15V SOT23 5322 130 44743 S

Q38 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q39 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q4 TRANSI-HF N SMD BFR93A 35mA 12V SOT23 5322 130 60705 S

Q5 TRANSISTOR BCP51 1.5A 45V SOT223 5322 130 62639 S

Q6 TRANSISTOR BC847B .1A45V SOT23 4822 130 60511 S

Q7 TRANSISTOR 0.5A BC807-25 45V SOT23 5322 130 60845 S

R1 RESISTOR 47 ohm 1% 0.125W 100PPM 1206 5322 116 80448 S

R10 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R100 RESISTOR 27 ohm 1% 0.1W 100PPM 0805 4031 002 27090 S

Pos Description Part No.

R101 RESISTOR 4.7 kohm 1% 0.125W 100PPM 1206 4822 051 54702 S

R105 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R106 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R107 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R108 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R109 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R11 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R110 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R111 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R112 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R113 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R115 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R116 RESISTOR 15.0 kohm 1% .125W 100PPM 1206 5322 116 82261 S

R117 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R118 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R119 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R12 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R121 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R122 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R123 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R124 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R125 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R126 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R127 RESISTOR 1.00 Mohm 1% 0.125W 100PPM 1206 4822 051 10105 S

R128 RESISTOR 1.50 kohm 1% 0.125W 100PPM 1206 4822 051 51502 S

R129 RESISTOR 470 ohm 1% .125W 100PPM 1206 4822 051 54701 S

R13 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R130 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R131 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R132 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R133 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R134 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R135 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R136 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R137 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R138 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R139 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R14 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R140 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R141 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R142 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R143 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R144 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R145 RESISTOR 330 ohm 1% .125W 100PPM 1206 4822 051 53301 S

R146 RESISTOR 15.0 kohm 1% .125W 100PPM 1206 5322 116 82261 S

R147 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R148 THERMISTOR 16.0 20% 3.5A S236/16 5322 116 30457 S

R149 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R15 RESISTOR 150 ohm 1% 0.125W 100PPM 1206 4822 051 51501 S

R150 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R151 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R152 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R153 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R154 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R155 RESISTOR 330 ohm 1% .125W 100PPM 1206 4822 051 53301 S

R158 RESISTOR 120 ohm 1% 0.1W 100PPM 0805 5322 117 12506 S

R159 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R16 RESISTOR 150 ohm 1% 0.125W 100PPM 1206 4822 051 51501 S

R160 RESISTOR 390 ohm 1% .125W 100PPM 1206 4822 051 53901 S

R161 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R162 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R163 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R164 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R165 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

7-8 Replacement Parts, Main Board

Page 57: Programmable Frequency Counter

Pos Description Part No.

R166 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R167 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R168 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R169 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R17 RESISTOR 27.0 ohm 1% .125W 100PPM 1206 5322 116 82262 S

R170 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R171 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R172 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R173 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R174 RESISTOR 330 ohm 1% .125W 100PPM 1206 4822 051 53301 S

R175 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R176 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R177 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R178 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R179 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R18 RESISTOR 68.0 kohm 1% .125W 100PPM 1206 4822 051 56803 S

R180 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R181 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R182 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R183 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R184 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R185 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R186 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R187 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R188 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R189 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R19 RESISTOR 22.0 kohm 1% .125W 100PPM 1206 4822 051 52203 S

R190 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R191 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R193 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R194 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R195 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R196 RESISTOR 120 ohm 1% 0.1W 100PPM 0805 5322 117 12506 S

R197 RESISTOR 120 ohm 1% 0.1W 100PPM 0805 5322 117 12506 S

R198 RESISTOR 4.70 kohm 1% .125W 100PPM 1206 4822 051 54702 S

R199 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R2 RESISTOR 100 ohm 1% 0.125W 100PPM 1206 4822 051 51001 S

R20 RESISTOR 8.20 kohm 1% .125W 100PPM 1206 4822 051 10822 S

R200 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R201 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R202 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R203 RESISTOR 560 ohm 1% .125W 100PPM 1206 4822 051 10561 S

R204 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R205 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R206 RESISTOR 5.60 kohm 1% .125W 100PPM 1206 4822 051 10562 S

R207 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R209 RESISTOR 560 ohm 1% .125W 100PPM 1206 4822 051 10561 S

R21 RESISTOR 15.0 ohm 1% .125W 100PPM 1206 4822 051 10159 S

R211 RESISTOR 1.00 Mohm 1% 0.125W 100PPM 1206 4822 051 10105 S

R217 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R218 RESISTOR 680 ohm 1% .125W 100PPM 1206 4822 051 56801 S

R219 RESISTOR 330 kohm 1% .125W 100PPM 1206 5322 117 10969 S

R22 RESISTOR 220 kohm 1% .125W 100PPM 1206 4822 051 52204 S

R220 SENSOR-TEMP KTY82/120 5322 130 10682 S

R222 RESISTOR 180 kohm 1% .125W 100PPM 1206 4822 051 51804 S

R23 RESISTOR 220 kohm 1% .125W 100PPM 1206 4822 051 52204 S

R230 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R233 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R235 RESISTOR 120 ohm 1% 0.1W 100PPM 0805 5322 117 12506 S

R24 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R241 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R242 RESISTOR 680 ohm 1% 0.125W 100PPM 1206 4822 051 56801 S

R243 RESISTOR 18.0 kohm 1% .125W 100PPM 1206 5322 117 10034 S

R244 RESISTOR 82 ohm 1% .125W 100PPM 1206 4822 051 10829 S

Pos Description Part No.

R245 RESISTOR 3.90 kohm 1% .125W 100PPM 1206 4822 051 53902 S

R247 RESISTOR 820 ohm 1% .125W 100PPM 1206 5322 116 82264 S

R248 RESISTOR 680 ohm 1% .125W 100PPM 1206 4822 051 56801 S

R249 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R25 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R251 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R252 RESISTOR 100 ohm 1% .125W 100PPM 1206 4822 051 51001 S

R253 RESISTOR 560 ohm 1% 0.125W 100PPM 1206 4822 051 10561 S

R254 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R255 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R258 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R259 RESISTOR 680 ohm 1% .125W 100PPM 1206 4822 051 56801 S

R26 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R260 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R261 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R262 RESISTOR 10.0 ohm 1% 0.125W 100PPM 1206 4822 051 10109 S

R263 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R264 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R265 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R266 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R267 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R268 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R269 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R27 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R270 RESISTOR 8.20 kohm 1% .125W 100PPM 1206 4822 051 10822 S

R271 RESISTOR 820 ohm 1% .125W 100PPM 1206 5322 116 82264 S

R272 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R273 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R274 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R275 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R276 RESISTOR 33.0 kohm 1% .125W 100PPM 1206 4822 051 53303 S

R277 RESISTOR 33.0 kohm 1% .125W 100PPM 1206 4822 051 53303 S

R278 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R279 RESISTOR 8.20 kohm 1% .125W 100PPM 1206 4822 051 10822 S

R28 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R280 RESISTOR 820 ohm 1% .125W 100PPM 1206 5322 116 82264 S

R281 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R282 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R283 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R284 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R285 RESISTOR 33.0 kohm 1% .125W 100PPM 1206 4822 051 53303 S

R286 RESISTOR 33.0 kohm 1% .125W 100PPM 1206 4822 051 53303 S

R287 RESISTOR 0 ohm JUMPER RC-01 1206 4822 051 10008 S

R288 RESISTOR 68 ohm 1% .125W 100PPM 1206 4822 051 10689 S

R288 RESISTOR 33.0 ohm 1% .125W 100PPM 1206 4822 051 10339 S

R289 RESISTOR 220 ohm 1% 0.1W 100PPM 0805 4031 002 22010 S

R29 RESISTOR 22.0 kohm 1% .125W 100PPM 1206 4822 051 52203 S

R290 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R291 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R292 RESISTOR 0 ohm JUMPER RC-01 1206 4822 051 10008 S

R293 RESISTOR 330 ohm 1% .125W 100PPM 1206 4822 051 53301 S

R294 RESISTOR 27 ohm 1% 0.1W 100PPM 0805 4031 002 27090 S

R295 RESISTOR 270 ohm 1% .125W 100PPM 1206 4822 051 10271 S

R296 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R297 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R298 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R3 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R30 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R300 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R301 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R302 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R303 RESISTOR 27 ohm 1% 0.1W 100PPM 0805 4031 002 27090 S

R304 RESISTOR 120 ohm 1% 0.1W 100PPM 0805 5322 117 12506 S

R305 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

Replacement Parts, Main Board 7-9

Page 58: Programmable Frequency Counter

Pos Description Part No.

R306 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R307 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R309 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R31 POTENTIOMETER 100 kohm 3304X-1-104 5322 101 10841 S

R310 RESISTOR 27 ohm 1% 0.1W 100PPM 0805 4031 002 27090 S

R311 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R312 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R313 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R314 RESISTOR 120 ohm 1% 0.1W 100PPM 0805 5322 117 12506 S

R315 RESISTOR 820 ohm 1% .125W 100PPM 1206 5322 116 82264 S

R316 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R317 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R318 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R319 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R32 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R320 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R321 RESISTOR 10.0 ohm 1% 0.125W 100PPM 1206 4822 051 10109 S

R322 RESISTOR 10.0 ohm 1% 0.125W 100PPM 1206 4822 051 10109 S

R323 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R325 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R326 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R327 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R328 RESISTOR 27 ohm 1% 0.1W 100PPM 0805 4031 002 27090 S

R329 RESISTOR 120 ohm 1% 0.1W 100PPM 0805 5322 117 12506 S

R33 POTENTIOMETER 10 kohm 3304X-1-103 5322 100 11143 S

R330 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R331 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R34 RESISTOR 18.0 kohm 1% .125W 100PPM 1206 5322 117 10034 S

R35 RESISTOR 470 ohm 1% .125W 100PPM 1206 4822 051 54701 S

R36 RESISTOR 470 ohm 1% .125W 100PPM 1206 4822 051 54701 S

R37 RESISTOR 1.50 kohm 1% 0.125W 100PPM 1206 4822 051 51502 S

R38 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R39 RESISTOR 10 MOHM 10% 0.25W RC-01 1206 4822 051 10106 S

R4 RESISTOR 220 kohm 1% .125W 100PPM 1206 4822 051 52204 S

R40 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R41 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R42 RESISTOR 15.0 ohm 1% .125W 100PPM 1206 4822 051 10159 S

R43 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R44 RESISTOR 47 ohm 1% .125W 100PPM 1206 5322 116 80448 S

R45 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R46 RESISTOR 150 ohm 1% 0.125W 100PPM 1206 4822 051 51501 S

R47 RESISTOR 150 ohm 1% 0.125W 100PPM 1206 4822 051 51501 S

R48 RESISTOR 82 ohm 1% .125W 100PPM 1206 4822 051 10829 S

R49 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R5 RESISTOR 220 kohm 1% .125W 100PPM 1206 4822 051 52204 S

R50 RESISTOR 8.2 ohm 10% 0.25W RC-01 1206 4822 051 10828 S

R51 RESISTOR 2.70 kohm 1% .125W 100PPM 1206 4822 051 52702 S

R53 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R54 RESISTOR 560 ohm 1% .125W 100PPM 1206 4822 051 10561 S

R55 RESISTOR 560 ohm 1% .125W 100PPM 1206 4822 051 10561 S

R56 RESISTOR 390 ohm 1% .125W 100PPM 1206 4822 051 53901 S

R57 RESISTOR 15.0 kohm 1% .125W 100PPM 1206 5322 116 82261 S

R58 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R6 RESISTOR 47 ohm 1% .125W 100PPM 1206 5322 116 80448 S

R60 RESISTOR 4.70 kohm 1% .125W 100PPM 1206 4822 051 54702 S

R61 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R63 RESISTOR 6.80 kohm 1% .125W 100PPM 1206 4822 051 10682 S

R64 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R65 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R66 RESISTOR 4.70 kohm 1% .125W 100PPM 1206 4822 051 54702 S

R67 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R69 POTENTIOMETER 100 kohm 3304X-1-104 5322 101 10841 S

R7 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R70 POTENTIOMETER 100 kohm 3304X-1-104 5322 101 10841 S

Pos Description Part No.

R71 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R72 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R73 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R74 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R75 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R76 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R77 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R78 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R79 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R8 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R80 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R81 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R82 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R83 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R84 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R85 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R86 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R87 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R88 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R89 RESISTOR 68 ohm 1% .125W 100PPM 1206 4822 051 10689 S

R9 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R90 RESISTOR 68 ohm 1% .125W 100PPM 1206 4822 051 10689 S

R91 POTENTIOMETER 100ohm CVR-4A-101 5322 101 10989 S

R92 RESISTOR 8.20 kohm 1% .125W 100PPM 1206 4822 051 10822 S

R93 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R94 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R95 RESISTOR 3.30 kohm 1% .125W 100PPM 1206 4822 051 53302 S

R96 RESISTOR 1.80 kohm 1% .125W 100PPM 1206 4822 051 10182 S

R98 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R99 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

U1 IC-OP AMP CA3140AM CA3140 AM BIMOS SO8 9322 114 39682 R

U10 IC-ANA TL7705BCD SMD LOW VOLT DETECT 5322 209 90426 R

U11 IC MICROP N80C196KB10 5322 209 52203 R

U12 IC-PROM 24LC16B 16kBIT I2C SMD SO8 9322 186 14682 P

U13 IC PC74HC574T SO20 4822 209 60451 S

U14 IC PC74HC573T SO20 5322 209 60424 S

U15 IC PC74HC02T SO-14 5322 209 71563 S

U16 IC PC74HC573T SO20 5322 209 60424 S

U17 IC PC74HC573T SO20 5322 209 60424 S

U18 IC PC74HC21T SO14 5322 209 60437 S

U19 IC PC74HC00T SO14 5322 209 71802 S

U2 IC PC74HC574T SO20 4822 209 60451 S

U20 IC PC74HC138T SO16 5322 209 73178 S

U21 IC NE532D DUAL SO-8 5322 209 71553 R

U22 IC-SRAM TC55257DFL-85L SOP28 32Kx8 9322 106 65682 R

U23 IC-PROM PM6685 27C512 5322 209 31776 P

U23 IC SOCKET 32 POL P/N 213-032-602 5322 255 41141 S

U24 IC PC74HC32T SO14 4822 209 63475 S

U25 IC PC74HC32T SO14 4822 209 63475 S

U26 IC-CMOS 74HC10 SO14 SO-14 9337 142 80653 S

U27 IC-DIG ECL 100331QC 3XDFLIP-FLOP PCC28 5322 209 33604 S

U28 IC-BUS TRANSCEIV 75ALS176D SO-8 SMD 5322 209 33171 R

U29 IC-ASIC 5322 209 90513 R

U3 IC PC74HC4353T SO20 4822 209 62805 S

U30 IC PC74HC00T SO14 5322 209 71802 S

U31 IC-OMV ADC 10BIT ADC1061C1WM SO20 9322 187 55682 R

U32 IC PC74HC573T SO20 5322 209 60424 S

U34 IC PC74HC00T SO14 5322 209 71802 S

U35 IC-OMV ADC 10BIT ADC1061C1WM SO20 9322 187 55682 R

U36 IC PC74HC573T SO20 5322 209 60424 S

U38 IC NE532D DUAL SO-8 5322 209 71553 S

U39 POWER MODULE 5322 693 22828 R

U4 IC 8 BIT PM7528HPC PLCC20 4822 209 62803 S

U40 IC HEF4013BT SO14 5322 209 14477 S

7-10 Replacement Parts, Main Board

Page 59: Programmable Frequency Counter

Pos Description Part No.

U41 INSULAT.PLATEP TO220 CLIP Sil-Pad 400AC 5322 466 61813 P

U41 CLAMP TO220 5322 401 11257 P

U41 IC 12V LM2940CT-12 TO220 4822 209 62085 S

U43 INSULAT.PLATEP TO220 CLIP Sil-Pad 400AC 5322 466 61813 S

U43 CLAMP TO220 5322 401 11257 P

U43 IC 1.50 A LM337T TO-220 5322 209 81236 S

U44 IC-CMOS 74HC125 SMD SO14 9337 569 90701 S

U5 IC NE532D DUAL SO-8 5322 209 71553 S

U50 IC-COMP MAX961 SO8 4.5ns 9322 194 34682 R

U6 IC NE532D DUAL SO-8 5322 209 71553 S

U7 IC NE532D DUAL SO-8 5322 209 71553 S

U8 IC-COMP AD96687BP PLCC20 4822 201 62795 R

U9 IC-DIG ECLIPS MC10E104 4822 209 31775 R

Replacement Parts, Main Board 7-11

Page 60: Programmable Frequency Counter

7-12 Replacement Parts, Front Board

Front Board

Pos Description Part Number

5 Connector row, SG0.25x100x6.0x3.0 5322 267 70294 R

7 LCD Display 5322 214 91033 R

10 LCD bezel 4031 100 62820 R

11 Backlight-LED 5322 130 82201 R

14 Window LCD 5322 381 11136 P

16 LED spacer, LEDS1E-3-01 for led 5322 255 41228 P

20 Rubber keypad 4031 100 62720 R

32 Screw, RX-PT Z 2-28X8 FZB 4822 502 30081 P

C201 Capacitor 10 nF 20% 50V X7R, 0805 5322 122 34098 S

C202 Capacitor 10 nF 20% 50V X7R, 0805 5322 122 34098 S

D201 LED 3 mm HLMP-1300 red 5322 130 81921 R

Pos Description Part Number

D202 LED 3mm Yellow 590nm

4-8MCD/10mA

4822 130 30953 R

P204 Connector 40 POL TMH-120-01-L-DW 5322 265 51295 P

R201 Resistor 220 k 1% .125W 100PPM

1206

4822 051 52204 S

R204 Resistor, 10.0 1% 0.125W 1206 4822 051 10109 S

R205 Resistor, 10.0 1% 0.125W 1206 4822 051 10109 S

R206 Resistor, 10.0 1% 0.125W 1206 4822 051 10109 S

R207 Resistor, 10.0 1% 0.125W 1206 4822 051 10109 S

U201 IC, PCF8576T, VSO56 5322 209 11129 R

U202 IC, PCF8576T, VSO56 5322 209 11129 R

ORIENTATION MARK FOR LCD

TORQUE 3 Ncm

TIGHTEN THIS SCREW FIRST TO GUIDE LCD HOLDER

Page 61: Programmable Frequency Counter

GPIB Interface (PM9626B)

Pos Description Part Number

Connector, KC-79-35 5322 267 10004 S

IC-Socket, 40pin, DIL 5322 255 44217 S

Lock Washer, YT3.2 ST FZ DIN6798A 4822 530 80082 P

Screw, MRT-KOMBI 3X08, STFZ 5322 502 21489 P

Screw, MRT-KOMBI 3X10, STFZ 5322 502 21644 P

Spring Washer, KBA 3.2 ST FZ

DIN137

4822 530 80173 P

BU101 Cable Assy 5322 321 61341 P

BU103 Connector 24pin

57LE-20240-77OOD35G

5322 267 60148 P

C101 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C102 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C103 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C104 Capacitor 220 pF 5% 50V NP0 0805 4822 122 33575 S

C105 Capacitor 100 nF 10% 63V X7R 1206 4822 122 33496 S

C106 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C107 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C108 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C109 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C110 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C111 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C112 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C113 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C114 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C115 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C116 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C117 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C118 Capacitor 68 F 20% 6.3V SOLID AL 5322 124 10455 S

IC101 IC PC74HC32T SO14 4822 209 63475 S

IC103 IC NE532D DUAL SO-8 5322 209 71553 R

IC106 IC PC74HC00T SO14 5322 209 71802 S

IC107 IC PC74HC573T SO20 5322 209 60424 S

IC108 IC PC74HC573T SO20 5322 209 60424 S

IC109 IC socket 32pin P/N 213-032-602 5322 255 41141 S

IC109 IC-PROM PM9626B 5322 209 51853 R

IC111 IC-SRAM TC55257DFL-85L SOP2832Kx8

9322 106 65682 R

IC113 IC-DIG UPD7210D IEC BUS GPIBCONTROLLER

9322 023 60682 R

IC114 IC SN75160AN 5322 209 81807 R

IC115 IC SN75161AN 5322 209 81842 R

IC116 IC PC74HC573T SO20 5322 209 60424 S

IC117 IC PC74HC86T SO-14 5322 209 71562 S

R101 Resistor 47 k 1% 1/8W 100PPM 1206 5322 116 80446 S

R102 Resistor 47 k 1% 1/8W 100PPM 1206 5322 116 80446 S

R103 Resistor 4.7 k 1% 1/8W 100PPM 1206 4822 051 54702 S

R104 Potentiometer 1k 3304X-1-102E 5322 101 11095 S

R105 Resistor 10 k 1% 1/8W 100PPM 1206 4822 051 51003 S

R106 Resistor 330 1% 1/8W 100PPM 1206 4822 051 53301 S

R107 Potentiometer 10 k 25% 0.1W

3304X-1-103

5322 100 11143 S

R108 Resistor 3.3 k 1% 1/8W 100PPM 1206 4822 051 53302 S

R109 Resistor 100 1% 1/8W 100PPM 1206 4822 051 51001 S

R110 Resistor 100 1% 1/8W 100PPM 1206 4822 051 51001 S

R111 Resistor 1 k 1% 1/8W 100PPM 1206 4822 051 51002 S

R112 Resistor 100 k 1% 1/8W 100PPM 1206 4822 051 51004 S

R113 Resistor 100 k 1% 1/8W 100PPM 1206 4822 051 51004 S

Pos Description Part Number

R114 Resistor 100 k 1% 1/8W 100PPM 1206 4822 051 51004 S

R115 Resistor 100 k 1% 1/8W 100PPM 1206 4822 051 51004 S

R116 Resistor 100 k 1% 1/8W 100PPM 1206 4822 051 51004 S

R117 Resistor 100 k 1% 1/8W 100PPM 1206 4822 051 51004 S

SK101 DIP switch 6-p 206-6 RAST 5322 277 21125 R

Replacement Parts, GPIB Interface (PM9626B) 7-13

Page 62: Programmable Frequency Counter

This page is intentionally left blank.

7-14 Replacement Parts, GPIB Interface (PM9626B)

Page 63: Programmable Frequency Counter

Chapter 8

Drawings & Diagrams

Page 64: Programmable Frequency Counter

How to read the diagrams

This chapter contains circuit diagrams and component layout.

Each diagram has been completed with lists of the ICs used in the

unit. This list indicates the connections that are not shown in the dia-

gram, such as GND and supply voltages.

Signals

The signals in these units are named after what they do, e.g.,

LEAD-EDGE is used as control current to the leading edge circuits.

Two different types of arrows are used to mark references for contin-

ued connection somewhere else in the diagram.

This arrow is used if the reference is directed to a point

located on the same page.

This arrow is used if the reference is directed to a point

located on another page. The example means that the

point is on sheet 1, coordinate A1.

Circuit symbols

The circuit diagrams are computer drawn. The symbols conform to

the IEC standards. These symbols are designed to be logical and easy

to read.

The component number is written above the symbol.

Inside the symbol, at the top is an abbreviated description of the cir-

cuit’s function.

Pin numbers are written outside the symbol and, if it is a complex cir-

cuit, the pin functions are written inside.

A small circle on a pin indicates that the input/output inverts the sig-

nal.

The component name is written below the symbol.

The signal flow through the circuit is always from left to right.

Resistors, capacitors, diodes, transistorsand other components.

These components are similar to the old fashioned, hand-drawn sym-

bols.

They have their component number above and their value or compo-

nent name below.

Aresistor contained in a resistor network has a frame drawn around it

and one of the pin numbers is written to the left or below it.

Component numbers

“R305" is a typical component number. The ”R" indicates that it is a

resistor,"3" that it is positioned on the “unit 3", and 05 that it is the

fifth resistor in the component list for that unit.

Drawings & Diagrams 8-2

/1.A1

A1

Page 65: Programmable Frequency Counter

This page is intentionally left blank.

Drawings & Diagrams 8-3

Page 66: Programmable Frequency Counter

Main PCB, Component layout

8-4 Drawings & Diagrams

Top View

Page 67: Programmable Frequency Counter

Control Logic, PCB 1, sheet 1(5)

Drawings & Diagrams 8-5

AR7AR6AR5AR4AR3AR2AR1AR0

AR1AR2

AR

0

AR

1

AR

3

AR

5

AR

6

AR

7A

D7

AD

6

AD

5

AD

4

AD

3

AD

2

AD

1

AD

0

AR

2

AR

4

AD0AD1AD2AD3AD4AD5AD6AD7AD8AD9

AD10AD11AD12AD13

AD0AD1AD2AD3AD4AD5AD6AD7

A0A1A2A3A4A5A6A7

ALE

A[0-15]

INST

A13

A9A10A11

A13

WAITSTATE

A8A9A10A11A12A13A14

AD7

AD0AD1AD2AD3AD4AD5AD6

A0A1A2A3A4A5A6A7

RD

WRL

CSKEYBOARD

CSKEYBOARDIN

AR[0-7]

AD13AD12AD11AD10AD9AD8

AR6AR5AR4AR3AR2AR1AR0

AR7

AD[0-15]

CS

KE

YB

O

AR

DO

UT

6MHz

CSROM

CSRAM

AD13AD12AD11AD10AD9AD8 A8

A9A10A11A12A13A14A15

AD0AD1AD2AD3AD4AD5AD6AD7

A0A1A2A3A4A5A6A7A8A9A10A11A12

A15A14

AD14

AD15

RAM/ROM

AD14

A15

AD15

A14

AD15

AD14

BUSWIDTH

RD

A8

WRL

CS

GP

IB

AR3

AR0

AR

[0-7

]

+5V

+5V

+5V

+5V

+5V

+5V

+5V

+5V

+5V

+5V

+5V

+5V

+5V

+5V

+12V

-5.2V

+5V

+5CPU

+5CPU

+5V

+5V

-5.2V

+5V

U+12V

+5V

+5V

+1

2V

RE

G/B

AT

T

+5V

U+12V

+12VREG /BATT

+7V

+5V

+5V

+5CPU

-5.2V

+5V

+7V

+5V

U+12V

+12VREG /BATT

+7V

LO BATT

CSIA

CSASIC

DACMUX

CSRLY

CSDAC

A8

AR[0-7]

ALE

RD

WRL

DISABLE STANDBY

ENA-EXT-REF

CSIB

C

GET

12MHZ

AD[0-15]

BACKLIGHT

BURST CARRY 1CARRY 2

FIN

ON

STAND BY

-5.2V

TEST SIGNALS

TO GPIB

TO

DIS

PLA

Y/

KE

YB

OA

RD

TO PRESCALER

STAND BY IND.

TEST

RESET

GATE IND.

EEPROM

R178

56R17310K

R18556

U12B24LC16BG

ND

4V

CC

8

U20BHC138V

CC

16

GN

D8

U10

TL7705B

SENSE7

RESIN2

CT3

GND4

RESET5

RESET6

REF1

VCC8

R19510K

J13

U12A

24LC16B

SDA5

SCL6

A01

A12

A23

WP7

&

U26B

HC10

345

6

C9215uF-6.3V

&

U26C

HC10

91011

8

C95100nF

U13A

HC574

OE1

C111

Q019

Q118

Q217

Q316

Q415

Q514

Q613

Q712

D02

D13

D24

D35

D46

D57

D68

D79

U17BHC573V

CC

20

GN

D1

0

&

U19A

HC00

1

23

&

U18B

HC21

910

1213

8

R166100K

&

U26A

HC10

1213

12

C9910n

R20010K

R162100K

R174330

R160390

R19156

J14

J19

TMH-108- 01-L-DW

12345678910

131211

141516

B1

12MHz

R203560

1

U24C

HC32

9

108

C8522p

R18656

R1702.2K

R18256

R205

56

1

U25A

HC32

1

23

CPU

ADR

DATA

U11

80C196KB

XTAL167

XTAL266

RESET16

EA2

NMI3

AGND12

VREF13

VSS14

VPP37

READY43

BUSWIDTH64

ACH0/P0.06

ACH1/P0.15

ACH2/P0.27

ACH3/P0.34

ACH4/P0.411

ACH5/P0.510

ACH6/P0.68

ACH7/P0.79

P1.019

P1.120

P1.221

P1.322

P1.423

P1.530

P1.631

P1.732

TDX/P2.018

RDX/P2.117

EXTINT/P2.215

T2CLK/P2.344

T2RST/P2.442

PWM/P2.539

P2.633

P2.738

CLKOUT65

WR/WRL40

BHE/WRH41

RD61

ALE/ADV62

INST63

AD0/P3.060

AD1/P3.159

AD2/P3.258

AD3/P3.357

AD4/P3.456

AD5/P3.555

AD6/P3.654

AD7/P3.753

AD8/P4.052

AD9/P4.151

AD10/P4.250

AD11/P4.349

AD13/P4.547

AD14/P4.646

AD15/P4.745

AD12/P4.448

HSI.024

HSI.125

HSO.4/HSI.226

HSO.5/HSI.327

HSO.028

HSO.129

HSO.234

HSO.335

VSS68

VC

C1

VSS36

U22A

55257

CE20

A1021

OE22

A1123

A924

A825

A1326

R/W27

I/O111

I/O212

I/O313

I/O415

I/O516

I/O617

I/O718

I/O819

A141

A122

A010

A19

A28

A37

A46

A55

A64

A73

R167100K

&

U18A

HC21

12

45

6

C89100p

R17910K

R190

56

R201

10K

R163100K

C9610n

R17210K

R180

56

C101100nF

C100100nF

U24EHC32V

CC

14

GN

D7

&

U19B

HC00

4

56

C8622p

R18756

1

U15C

HC02

8

910

R175

10K

R176

56

C882.2uF-6.3V

R1712.2K

R159

10K

HC573

U16A

D02

D57

Q019

D35

OE1

Q514

Q316

Q613

D13

D68

D46

Q118

C111

Q415

Q217

D24

Q712

D79

U22B55257G

ND

14

VC

C2

8

R2042.2K

J29

1

2

3

R18356

U18CHC21V

CC

14

GN

D7

Q16BC847B

R168100K

C90100p

J30

1

2

3

U14BHC573V

CC

20

GN

D1

0

HC573

U14A

D02

D57

Q019

D35

OE1

Q514

Q316

Q613

D13

D68

D46

Q118

C111

Q415

Q217

D24

Q712

D79

L10

BLM21A102S

1

U15A

HC02

2

31

R164100K

HC573

U17A

D02

D57

Q019

D35

OE1

Q514

Q316

Q613

D13

D68

D46

Q118

C111

Q415

Q217

D24

Q712

D79

C9710n

U19EHC00V

CC

14

GN

D7

1

U24A

HC32

1

23

J17

Con40

12345678910111213141516171819202122232425262728293031323334353637383940

R181

56

C93100nF

Q15BC857B

R18856

1

U24D

HC32

12

1311

R177

56

J11

U23B27C512-90V

CC

32

GN

D1

6

R18456

R19410K

J18

Con40

123456789

10111213141516171819202122232425262728293031323334353637383940

R158

120

C9115uF-6.3V

R193

56

&

U19C

HC00

9

108

C94100nF

C87100nF

U20A

HC138

A01

A12

A23

Y015

Y114

Y213

Y312

Y411

Y5 10

Y6 9

Y7 7

E1A4

E2A5

E36

1

U15B

HC02

5

64

U16BHC573V

CC

20

GN

D1

0

1

U24B

HC32

4

56

R20210K

R165100K

C9810n

U23A

27C512-90JC

A152

A011

A110

A29

A38

A47

A56

A65

A74

A829

A928

A1024

A1127

A123

A1330

OE/VPP25

CE23

A1431

O013

O114

O215

O318

O419

O520

O621

O722

J12

&

U19D

HC00

12

1311

1

U15D

HC02

11

1213

R19910K

R161100K

U13BHC574V

CC

20

GN

D1

0

U15EHC02V

CC

14

GN

D7

U26DHC10V

CC

14

GN

D7

R169100K

R18956

Page 68: Programmable Frequency Counter

Main PCB, Component layout

8-6 Drawings & Diagrams

Bottom View

K2

K1

K3

K4

+ --

Page 69: Programmable Frequency Counter

Counter Circuits, PCB 1, sheet 2(5)

Drawings & Diagrams 8-7

AR0AR1AR2AR3

AR7

AD11AD12AD13

AR6

AD9AD8

AD10

AD15AD14

AR4AR5

+5M

+5M

+5M

+5V

+5V

+5V

+5M

+5ECL

+5V

+5M

+5M

+5ECL

-5ECL

+5ECL

-5ECL

-2ECL -2ECL

-2ECL -2ECL

-5ECL

+5ECL

-5ECL

-2ECL-2ECL

-5ECL

-2ECL

+5ECL

+5ECL

-5ECL

-5ECL

-5ECL

+5V

-5.2V

-5.2V

-5ECL

-2ECL

CSASIC

ALE

RD

WRL

GET

+12VREG/BATT

+5V

A

12MHZ

AD[0-15]

CARRY 2

CARRY 1

FIN

PXBPXASXBSXA

ENA-EXT-REF

BURST

AN

C

-2.1V

AR[0-7]

-5.2V

Externalcontrolinput(rear panel)

OscillatorselectionOscillator

selection

STD

STD

OPT

OPTO

PT

ION

AL

OS

CIL

LA

TO

R

Externalreferenceinput(rear panel)

Internalreferenceoutput(rear panel)

R230

100

R300

47

R512.7K

R268

1K

R31027

R208Not used

R249

47

C11115uF-6.3V

C177100nF

C14010n

J23

1

2

3

R265

1K

C18110n

R306220

BAV99D16

C107

10n

R312100

R248

680

C109

22p

R244

82

C18515uF-6.3V

J28BNC-Coax

Q39BFS17

C183

100nF

R2453.9K

Q37BSR12

U50

MAX961

+IN1

-IN2

SHDN3

LE4

VCC8

QN7

Q6

GND5

Q24BFG16A

L12

BLM21A102S

C142100nF

C18615uF-6.3V

EN

EN

U28

75ALS176D

34

21

67

5

8

U27C

100331

S21

C124

Q26

Q27

R23

1D25

R325

47

C122680pF

R211

1M

R32210

1

U25B

HC32

4

56

R302100

L17

BLM21A102S

U25EHC32V

CC

14

GN

D7

R329

R328

120

27

C131100nF

R235120

R260

47

U27A

100331

S11

C19

Q6

Q5

R10

1D7

R255

100

C114100p

C13915uF-6.3V

C176

100nF

C14110n

R326100

R266

1K

C13510n

R298

47

R305220

R315820

R311100

D15

BYD17G

C12882p

1

U25C

HC32

9

108

R323

47

C182100nF

C121100nF

Q34BFS17

C144Not Used

R327100

U27D100331

VC

C1

VC

CA

2V

EE

S8

VE

ES

15

VE

ES

22

VE

E1

4

MR16MS12

R267

100

C115

3-10pF

BAV99

D14

C120

10p

R233

47

R31356

R32110

Q27BFG16A

C10233pF

L15

BLM21A102S

C13410n

R314120

BNC-Coax

R217

100

R258

100

C13615uF-6.3V

TP28

R250Not used

R296220

C127

1n

C178

100nF

L11

BLM21A102S

R317220

R24110K

C12347p

C130

100nF

R2201K

B2

10MHz

R33047

R309

47

R3162.2K

BAV99D19

R32056

Q35BFS17

L14

BLM21A102S

R52

Not used

J27

BNC-Coax

R218680

1

U25D

HC32

12

1311

R219330K

Q32BFS17 C113

82p

R243

18K

C132

2.2uF-6.3V

COUNTER CIRCUIT

U29

57370

RTCX283

VBAT82

X246

PH252

MTCXO43

EXTREF48

MPCLK29

V+REFO41

V-REFO39

V+REFA54

V-REFA56

V+REFB58

V-REFB60

VREFAD88

IRES87

VCCN36

VCCB47

VCCC50

VCCE57

VCCD71

VCCG85

VCCA93

GNDA38

GNDB44

GNDC53

GNDE61

GNDD367

GNDD269

GNDD173

GNDD475

GNDG86

GET37

B268

A72

A274

B70

SR66

EXTC76

P65

BURST64

CS27

ALE26

WRL23

WRH24

RD25

HLDA99

QDMA28

RTCX184

ALARM81

X145

PH151

OUTMUX49

INTREF42

OTRIM40

VOUTA55

VOUTB59

INTP189

INTP290

INTS191

INTS292

FIN94

MTIME96

CY197

CY298

TRA62

TRB63

PG30

C180

C279

C378

C477

S131

S232

S333

S434

S535

INT95

HOLD100

A1619

A1720

A1821

A1922

AD02

AD13

AD24

AD35

AD46

AD57

AD68

AD79

AD810

AD911

AD1012

AD1113

AD1214

AD1315

AD1416

AD1517

GN

D

18

VC

C1

C7710p

L22

BLM21A102S

J25

1

2

3

R261

100

L21

BLM21A102S

L13

4.7uH

R297

C175

220

100nF

R303

R304

27

120

R2511K

U27B

100331

S17

C119

Q3

Q 4

R20

1D18

C179

100nF

Q38BFS17

R263

1K

R318220Q36

BSR12

R247

820

C116

47p

R254

10K

C11910n

C180100nF

R331

47

R307

47

R31956

C36100nF

R209

560

R242

R301100

C138

10n

L16

BLM21A102S

R97

Not used

BAV99

D18

C117100nF

R264220

R222180K

Q33BFS17

R259680

J24

4030-10A

123456789

10

D17

BYD17G

R26210

C184100nF

C110100 nF

C125

2.2uF-6.3V

C133

100n

C124100n

C143100nF

J26

R1014.7k

+5ECL

R252

100

C129

6.8p

R253

560

680

Page 70: Programmable Frequency Counter

This page is intentionally left blank.

8-8 Drawings & Diagrams

Page 71: Programmable Frequency Counter

Input Amplifier & Trigger Level DACs, PCB 1, Sheet 3(5)

Drawings & Diagrams 8-9

AR6

AR4

AR7

AR5

AR3AR2AR1

CSRLY

AR[0:7]

AR0AR1AR2

0.04V0.22V

0.59V1.6V

WRL

AR7AR6

AR5AR4AR3AR2AR1AR0

DACMUX

A8

AR0

-5.2

-5.2

+5

+7 +5

-5.2

-5.2

+5

+5D

+5

+5

-5.2

-5.2

-5.2

+5

+5

+5

-5.2

+7

-5.2L

-5.2

-5.2

-2.1

+5

-2.1

-2.1

-2.1

-2.1 -2.1-2.1

-2.1

-5.2

+5

-5.2

-5.2L

+5D

-5.2D

+5D

+5V

+5D

-5.2D

+5

-5.2

-2.1

-2.1

AR[0-7]

+7V

-5.2V

+5V

BACKLIGHT

A

CSRLY

CSDAC

WRL

A8

DACMUX

AN

-2.1V

TRIG LEVEL DAC'S

DAC RANGE REFERENCE

( U16 )

+

-

U5A

NE532D

2

31

R36470

R1727

BAV99D4

L5

4S2 3.5X6MM

K3A

REED

81

71

4

R928.2K

C4910n

R13120

R111100

U1B3140

V+

7

V-

4

R45

47

R26470K

Q11BC817-25

R11615K

R6510K C38

10n

R107100

R62Not used

C2510p

U5CNE532D

V+

8

V-

4

C910n

R604.7K

R3310K

R84

10K

Q13BFG97

C6810n

C4110n

K1B

REED

26

13

R4882

C5910n

K4B

87

9

R68Not used

R32470K

D1

BAT18

U8B

AD96687BP

LE17

LE15

+12

-13

OUT20

OUT 19

C1910n

L25

BLM21A102S

R88

100

U3

HC4353T

ACOM18

BCOM19

CCOM5

VEE9

A117

B11

B02

C06

C14

VCC20

GND10

E17

E28

LE11

A016

S015

S113

S212

C37100nF

R1922K

R23

220K

R80

10K

C2310n

U2BHC574V

CC

20

GN

D1

0

R72

100K

R114

C3210n

C5310n

+

-

U6B

NE532D

6

57

K1AREED

81

71

4

C1615uF-6.3V

C61n

R76

10K

BAV99

D5

C20

1n

R6

47

&U9C

10E104

2728 13

12

R961.8K

R30470K

C1

0.5-2pF

R3

470K

Q4BFR93A

R49100

+

-

U5B

NE532D

6

57

R8120

R112100

R1

47

TP10

C8010n

&

U9A

10E104

45 8

7

R11510K

R43100

R27470K

C3

22nF

TP26

C502.2uF-6.3V

R7120

R108100

C2610p

U6CNE532D

V+

8

V-

4

R37

1.5K

K2B

REED

26

13

C1010n

R9347

R11747

R85

10K

C6910n

C4210n C2710n

R119

1K

R46150

D2

BAT18

R664.7K

R69100K

C29

100nF

R81

10K

C2410n

K4A

34

2

C39

6.8u-16V

R636.8K

TP11

C5610n

C5410n

R34

18K

R15150

TP27

C45100nF

R44

47

R58120

R77

10K

C55100nF

C5

10n

L1

220uH

Q2BFR92A

R89

68

R208.2K

+

-U1A

3140

2

36

1 8 5

R73

10K

R10120

R113100

R21

15

R39 R10010M

R4047

27

R28470K

L23

4S2 3.5X6MM

+

-

U7A

NE532D

2

31

&U9B

10E104

23 10

9

U4

PM7258

CS15

WR16

DACA/DACB6

D014

D113

D212

D311

D410

D59

D68

D77

VREF A4

VREF B18

RFB A3

OUT A2

RFB B19

OUT B20

AGND1

VCC17

GND5

C1410n

C4810n

R9120

R109100

U7CNE532D

V+

8

V-

4

R91100

C1110n

R9447

R24470K

R4

220K

L4

BLM21A102S

R11847

R86

10K

C4310n

L24

BLM21A102S

U9F

10E104VE

E1

VC

C0

16

F219

VC

C11

F120

VC

C0

21

J1

C2810n

C710n

R31100K

C30100nF

U8A

AD96687BP

LE5

LE7

+10

-9

OUT2

OUT3

R82

10K

C3310n

C6610n K3B

REED

26

13

C5710n

L2

4S2 3.5X6MM

R70100K

R61220

R16150

C1710n

K4C

11

0

R78

10K

C2110n

K2A

REED

81714

R120Not used

L3

4S2 3.5X6MM

C13

47p

C5110n

R90

68

R672.2K

R98Not used

R641K

R74

10K

R12120

C2

2-18pF

R35470

BAV99

D3

R59Not used

R5715K

C1510n

R11120

R110100

R47150

R50

8.2

C43.3pF

C1210n

R25470K

R5

220K

C4715uF-6.3V

+

-

U6A

NE532D

2

31

R2922K

C4610n

C4410n

R1868K

Q1BF513

J8

MiniCoax-3

R106100

R41220

C810n

U2A

HC574

OE1

C111

Q019

Q118

Q217

Q316

Q415

Q514

Q613

Q712

D02

D13

D24

D35

D46

D57

D68

D79

&

U9D

10E104

2526 15

14

Q3BFS17

C12610n

C61

15uF-6.3V

R83

10K

C40100nF

C3410n

C6710n

R381K

C5810n

+

-

U7B

NE532D

6

57

R953.3K

C1810n

R87

100

&

U9E

10E104

2324 18

17

C60100nF

R2

100

R22

220K

R79

10K

C2210n

R71

100K

C3110n

C5210n

R1051K

J2

R99Not used

R4215

Q10BC807-25

R75

10K

U8CAD96687BPG

ND

4V

CC

14

VE

E8

GN

D1

8

R14120

Page 72: Programmable Frequency Counter

8-10 Drawings & Diagrams

This page is intentionally left blank.

Page 73: Programmable Frequency Counter

Power Supply, PCB 1, sheet 4(5)

Drawings & Diagrams 8-11

PF

+7V

U+12V

+5V

-5.2V

+5V

U+12V

U+12V

-5.2V

U+12V

U+12V

+12V

+12V

+12V

STAND BY

ON

DISABLE STANDBY

+12V

+12VREG/BATT

LO BATT

+5V

-5.2V

U+12V

+7V

SIGNAL GROUNDSAFETY EARTH

EXT. DCON REARPANEL OPTIONAL

FAN

TO BATTUNIT

DISCONNECT IFBATTERY OPTIONINSTALLED

To RubidiumPower

To RubidiumPower

R55

560

D20

BZX79-B5V6

D8

SB140

R152220

R1472.2K

+

-

U21B

NE532D

6

57

J9

R124

100K

R143220

12V+

-U__

U41

LM2940CT-12

132

C632.2nF

C84220uF-50V

R139220

R128

1.5K

C7010n

R1984.7K

J6

R135220

C10310n

-+

D9

2KBP08

J10

R131220

K5A

48

6

U21CNE532D

V+

8

V-

4

C10610n

L9

33uH

J32

Con20

1

23456789

101112131415161718

1920

D10

SB140

R12110K

C7468uF-6.3V

R153220

D6

1N4003/200

C8315uF-6.3V

R125

100K

R144220

R56390

R149220

BAV99D13

TP15

+5V

R1562.2K

R140220

C7110n

C10410n

R2065.6K

Q14BC847B

R136220

R196120

R532.2K

K5B

139

11

R129470

1.25V

+

-U__

U42

LM317T

3 21

R132220

U40CHEF4013BTV

CC

14

GN

D7

J15

TP16

+15V

S1DC1R

U40A

HEF4013BT

6534

21

F1

1.6AT

L6

10mH

R154220

9

99

U39

POWER MODULE

+6

-7

+8

-9

+10

+11

-13

-14

PF12

+DCIN1

-DCIN4

-DCIN5

C64270uF

J3

Q7

BC807-25

1.25V

REG

U43

LM337T

In2

Out3

Adj1

BAV99

D12

Q5BCP51

R150220

R1576.81K

R122

100K

J7

R141220

C7210n

TP23

TP17

-7V

J21

1

2

3

R1261K

+

-

U21A

NE532D

2

31

J16

1

2

3

R137220

R145330

J4

L7

10uH

R130220

S1DC1R

U40B

HEF4013BT

89

1110

1213

R2071K

R133220

R197

120

R146

15K

C65100n

K5C

11

6

C7533uF-63V

R54560

C8215uF-6.3V

D7

SB140

R151220

R123

100K

TP21

+12V

J31

R14816

R142220

C7933uF-63V

C7310n

R155330

TP22

+7V

C622.2nF

J22

1

2

3

R138220

Q17BC817-25

L8

10uH

Q12BC847B

R134220

C35

470n

TP20

Q6BC847B

R1271M

C1056.8u-16V

J5

C7633uF-63V

Page 74: Programmable Frequency Counter

8-12 Drawings & Diagrams

This page is intentionally left blank.

Page 75: Programmable Frequency Counter

Interpolators, PCB 1, sheet 5(5)

Drawings & Diagrams 8-13

VREF-VREF+

VREF+

VREF-

+5ADC

VREF-AR6AR5AR4

AR2

AD9AD8

AD[0-15]

AR7

AD[0-15]

AR4AR5

AR7AR6

AR3

AD9AD8

AR0

AR1

AR2

AR1

AR0

AR3VREF+

+5V

+12J

+5V

+12J

+5J

+5J

+5V

+5V

+5J

+12J

+5J

+5V

+12V

CSIA

CSIB

SXB

PXB

SXA

PXA

AD[0-15]

AR[0-7]

Q31BFS17

C153470pF

U44EHC125V

CC

14

GN

D7 C173

10n

R289220

10nC108

U44D

HC125

12 11

13

C167100nF

C168100nF

C154

22p

U34E U32B

HC00VC

C1

4

GN

D7

+

-

U38B

NE532D

6

57

BAV99D25

C159100nF

R290

100

C163100nF

R280820

C150390pF

R272

2.2K

C148470pF

R275

2.2K

HC573

U32A

D02

D57

Q019

D35

OE1

Q514

Q316

Q613

D13

D68

D46

Q118

C111

Q415

Q217

D24

Q712

D79

C147Not Used

R29147

27

HC573

U36A

D02

D57

Q019

D35

OE1

Q514

Q316

Q613

D13

D68

D46

Q118

C111

Q415

Q217

D24

Q712

D79

BFT92

Q28

L19

BLM21A102S

R283100

&

U30A

HC00

1

23

BAV99

D23

U44A

HC125

2 3

1

10nC112

U31A

ADC1061

INT 2

S/H3

RD4

CS5

VREF-7

VIN8

VREF+9

DB218

DB119

DB020

DB614

DB515

DB416

DB317

DB713

DB812

DB911

L20

BLM21A102S

C174100nF

R285

33K

C1642.2uF-6.3V

&

U34B

HC00

4

56

C15615uF-6.3V

R294

C149

22p

C16910n

10n

U44C

HC125

9 8

10

U35A

ADC1061

INT 2

S/H3

RD4

CS5

VREF-7

VIN8

VREF+9

DB218

DB119

DB020

DB614

DB515

DB416

DB317

DB713

DB812

DB911

U38CNE532D

V+

8

V-

4

&

U34D

HC00

12

1311

R2870

VC

C1

+V

CC

6

GN

D1

0

C152Not Used

&

U30D

HC00

12

1311

C15110p

R2708.2K

R284

2.2K

C16615uF-6.3V

R281

2.2K

BAV99

D26

C14610p

+

-

U38A

NE532D

2

31

C1722.2uF-6.3V

C15715uF-6.3V

R277

33K

R295270

R269220

U44B

HC125

5 6

4

U36BHC573HC573 V

CC

20

GN

D1

0

10nC78

R273

47

BAV99

D24

BAV99D21

R2920

U30EHC00V

CC

14

GN

D7

BFT92

Q30

BAV99

D22

C11810n

&

U30B

HC00

4

56

U35BADC1061

U31BADC1061 V

CC

1

+V

CC

6

GN

D1

0

R28833

R271820

R28633K

C16510n

R278

220

C145390pF

&

U34C

HC00

9

108

R293330

L18

BLM21A102S

C158100nF

C160100nF

C161100nF

Q29BFS17

R2798.2K

VC

C2

0

GN

D1

0

&

U34A

HC00

1

23

10nC81

&

U30C

HC00

9

108

R282

47

C162

C155

C170 C171

100nF

100nF 100nF

R276

33K

R274100

Page 76: Programmable Frequency Counter

Display & Keyboard PCB, Component layout

8-14 Drawings & Diagrams

Page 77: Programmable Frequency Counter

Display & Keyboard, PCB 2

Drawings & Diagrams 8-15

MAIN BOARD

V0

H0

H1

H2

V1 V2 V3 V4 V5 V6 V7

12

12

4

4

6

6

2

2

10

10

8

8

9

9

7

7

1

1

BP0

BP0

S0

S0

S3

S3

S7

S7

S11

S11

S16

S16

S21

S21

S25

S25

S29

S29

S34

S34

S39

S39

S38

S38

S37

S37

S36

S36

S35

S35

S33

S33

S32

S32

S31

S31

S30

S30

S28

S28

S27

S27

S26

S26

S24

S24

S23

S23

S22

S22

S20

S20

S19

S19

S18

S18

S17

S17

S15

S15

S14

S14

S13

S13

S12

S12

S10

S10

S9

S9

S8

S8

S6

S6

S5

S5

S4

S4

S2

S2

S1

S1

BP1

BP1

BP2

BP2

BP3

BP3

3

3

13

13

14

14

18

18

22

22

27

27

31

31

34

34

39

39

44

44

48

48

52

52

56

56

55

55

54

54

53

53

51

51

50

50

49

49

47

47

46

46

45

45

43

43

42

42

41

41

40

40

38

38

37

37

36

36

35

35

33

33

32

32

30

30

29

29

28

28

26

26

25

25

24

24

23

23

21

21

20

20

19

19

17

17

16

16

15

15

19 P204 21 P204 23 P204 25 P204 27 P204 29 P204 31 P204 33 P204

MA

INB

OA

RD

3

5

7

P204

P204

P204

P204

P204

P204

P204

P204

P204

P204

P204

P204

P204

P204

P204

P204

P204

EXT REFS201

CHECKS202

MEAS RESTARTS209

DISP HOLDS210

<FUNCTIONS216

STAND-BY IND

GATEIND

SCL

SDA

ON

ONS222

R20410

R20510

R20610

D201

D202

CQV13-6YELLOW

REDHLMP-K150

R20710

LOCAL/PRESET

BACK-LIGHT

TEMPCOMP

+5V

GND

NC

+5V

+5V

11,7,8,9 5,10

511,7,8,9,10

+5V

+5V

+5V

+5V +5V

C20210n

C20110n

IC TYPE

BACKLIGHT

D203DL100

U201 PCF8576

PCF8576

PCF8576

PCF8576

U202

GND

SYNC

SYNC

DISPDR

DISPDR

VLCD

VLCD

CLK

CLK

OSC

SCL

SCL

SDA

SDA

SA0

SA0

A1

A1

A0

A0

A2

A2

OSC

R201

220k

U201

U202

LOCAL/PRESETS224

STAND-BY

STAND-BYS223

U+12V

FUNCTION>S217

MEAS TIMES218

MENUS219

AUX MENUS220

SINGLES221

NULL/OFFSETS211

BLANK DIGITSS212

DATA ENTRY UPS213

DATA ENTRY DNS214

ENTERS215

FILTERS203

IMPS204

TRIG LVLS205

AUTOS206

<SENSS207

SENS>S208

28

32

36

35

22

24

26

38

18

20

37

2 10 39

1 4 6 12 14 16 30

8 9 11 13 15 17 30 34

E201

82 78 74 70 66 60 58 55 52 49 46 4443

7 10 13 14 18 22 27 32 36 39403837353433313029282625242321201917161512119865432141 42

454748505153545657596162636465676869717273757677798081

Page 78: Programmable Frequency Counter

GPIB Unit, PM9626B, Component layout

8-16 Drawings & Diagrams

Page 79: Programmable Frequency Counter

GPIB Unit, PM9626B

Drawings & Diagrams 8-17

Page 80: Programmable Frequency Counter

This page is intentionally left blank.

8-18 Drawings & Diagrams

Page 81: Programmable Frequency Counter

Chapter 9

Appendix

Page 82: Programmable Frequency Counter

How to Replace SurfaceMounted Devices

Most of the components in this instrument are mounted on the sur-

face of the board instead of through holes in the board. These compo-

nents are not hard to replace but they require another technique. If

you do not have special SMD desoldering equipment, follow the in-

structions below:

9-2 How to Replace Surface Mounted Devices

Fig. 9-1 Heat the leads and push a thin aluminum sheetbetween the leads and the PC-board.

Fig. 9-2 When removed, clean the pads with desoldering

braid.

Fig. 9-3 Place solder on the pad.

Fig 9-4 Attach the IC to the pad with the solder.

Fig. 9-5 Solder all leads with plenty of solder; don’t worryabout short-circuits at this stage.

Fig. 9-6 Remove excessive solder with desoldering braid.

Fig. 9-7 Use a strong magnifying glass to make sure there

are no short-circuits or unsoldered leads.

Page 83: Programmable Frequency Counter

Electrostatic discharge

Almost all modern components have extremely thin conductors and

metal oxide layers. If these layers are exposed to electrostatic dis-

charge they will break down or perhaps even worse, be damaged in a

way that inevitably will cause a breakdown later on. The lectro-tatic

Discharge, (ESD) sensitivity of MOS and CMOS semiconductors

have been known quite a while, but nowadays bipolar semiconduc-

tors and even precision resistors are ESD sensitive. Consider

therefoe all components, pc boards and sub assemblies as sensi-

tive to electrostatic discharge. The text below explains how you can

minimize the risk of damage or destroying these devices by being

aware of the problems, and learning how to handle these compo-

nents.

ESD sensitive options are packed in conductive containers

marked with the symbol to the leftl.

Never open the container unless you are at an ESD protected

work station.

Use a wrist strap grounded via a high resistance.

Use a grounded work mat on your work-bench.

Never let your clothes come in contact with ESD sensitive

equipment even when you are wearing a grounded

wrist strap.

Never touch the component leads.

Never touch open connectors.

Use ESD-safe packing materials.

Use the packing material only once.

Keep paper and non conductive plastics etc. away from your

work-bench. These may block the discharge path to

ground.

Electrostatic discharge 9-3

Page 84: Programmable Frequency Counter

Glossary

A

ASIC Application Specific Integrated Circuit

C

Calibration Adjust-

ments

How to restore an instrument to perform in

agreement with its specifications

CSA Canadian Standards Association safety stan-

dard.

G

GaAs A technique to make very fast IC’s using

Gallium Arsenide substrate.

GPIB General Purpose Instrumentation Bus used for

interconnecting several measuring instruments

to a common controller.

I

I2C-bus An internal address- and data bus for communi-

cation between microcontroller, measuringlogic, and options.

IEC 1010-1 International Electrical Commission safetystandard.

L

LSI Large Scale Integrated circuit

O

OCXO Oven-Controlled X-tal Oscillator

P

PCA Printed Circuit Assembly

PCB Printed Circuit Board

Performance Check A procedure to check that the instrument is

functionally operational and performs to itsspecification. Must not require opening of cabi-

net. If the instrument passes the check it is con-

sidered as calibrate.

PWM Pulse Width Modulation

T

TCXO Temperature-Controlled X-tal Oscillator

9-4 Glossary

Page 85: Programmable Frequency Counter

Power Supply Switchmode Module

Circuit Descriptions

Primary Circuits

For primary circuits outside the power supply module, see Chapter 4,

Circuit Descriptions, Power Supply.

The power supply module generates three DC voltages to the sec-

ondary circuits.

R24-R27, R31, and R32 give the start-up voltage to the control cir-

cuit U03. U03 outputs a frequency of 120 kHz on OUT (pin 10) to the

switch transistor V01. When the switch transistor has started, U03

will be supplied from the transformer T01 pin 3 via the diodes D09.

Every switch pulse causes a voltage drop over the resistors R35-R37

and R55. This voltage feeds the SENSE input (pin 5) of the control

circuit U03. When the voltage has reached the internal reference

level in U03, the switch transistor V01 is turned off.

V05 is a blanking transistor that will compensate for high transients

generated by the transformer T01.

The internal sawtooth generator RC (pin 7) in U03 is connected to

the SENSE input via V03, to compensate for low load.

The regulated +5 V is sensed by U01 and adjusted by R50. The out-

put of U03 is connected to the VF input (pin 3) of U03 via the

optocoupler U02.

The VREF pin (pin 14) outputs a reference voltage of 5 V DC.

Secondary circuits

For secondary circuits see Chapter 4, Circuit Descriptions, Power

Supply.

Circuit Descriptions 9-5

P 01 p in 1

U 0 2

T 01

V01D 09R 24-R 27,

R 31-R 32

V05

V0 3

U0 3SE N SE

R C

V F

VR EF

O U T

P 02 pin 3

P0 2 pin 5 & 6

P0 2 pin 2

P0 2 pin 7

R 50

U 01

D 02

D 04

D 03T0 1

D 01

P 01

p in 4 & 5

P 02pin 1,4 , 8, & 9

Fig. 9-8 Power supply module primary circuits.

Page 86: Programmable Frequency Counter

Repair

Troubleshooting

Required Test Equipment

To be able to test the instrument properly using this manual you will

need the equipment listed in Table 9-1. The list contains specifica-

tions for the critical parameters.

Operating Conditions

Power voltage must be in the range of 90 to 260 VAC.

WARNING: Live parts and accessible terminals which

can be dangerous to life are always exposed inside

the unit when it is connected to the line power. Use

extreme caution when handling, testing or adjusting

the counter.

Primary circuits

CAUTION: If you adjust the +5 V trimmer you have to

adjust the complete instrument.

To verify the power supply proceed as follows:

– If the primary fuse is broken, there is a short circuit in the pri-

mary circuits. Use a DMM and try to locate the fault by resis-

tance measurements.

– Remove the cover from the power supply.

– Disconnect the power module from the main PCA and check

the resistance between pin 1 and 4 on the transformer T01, see

Fig. 9-9. If the DMM shows a short circuit, the fault is

proabably a broken transistor V01. Put the power module back.

– Connect the counter to the line power via an insulating trans-former with separate windings.

– Set the counter to STAND-BY mode.

– Check that the voltage between J9 and J10 is in the range of

90 to 260 VAC.

– Check that the DC voltage between pin 1 and 4 on T01 is

about 2 times the input AC voltage. If not, use traditional

faultfinding techniques to locate the fault.

– Disconnect the secondary load by moving the jumper J16 to its

alternative position.

– Check the “STAND BY” voltages according to Table 9-2.

– Restore the jumper J16 to its normal position.

– Check the waveforms in Fig. 9-10 at the corresponding

testpoints in Fig. 9-9 to verify the primary circuits. Use the

heat-sink of V01 as ground.

NOTE: U01 and U03 are located at the bottom side of the

PCA.

Secondary circuits

For secondary circuits see Chapter 5, Repair, Power Supply.

Safety Inspection and Test After Repair

General Directives

After repair in the primary circuits, make sure that you have not re-

duced the creepage distances and clearances.

Before soldering, component pins must be bent on the solder side of

the board. Replace insulating guards and plates.

9-6 Repair

Type Performance

DMM 3.5 digits

Oscilloscope 50 MHz 2-channel

Table 9-1 Required test equipment.

Test points Ground Voltage

U03 pin 11 & 12 U03 pin 8 +10 to +13.5 V

U03 pin 14 U03 pin 8 +5.0 V

V01 source U03 pin 8 +10 mV

U02 pin 1 Amplifier Screen +8.2 V

U01 pin 1 Amplifier Screen +4.4 V

TP15 Amplifier Screen +5.1 V

TP16 Amplifier Screen +14.8 V to +21 V

TP17 Amplifier Screen –12.5 V to –7.5 V

TP21 Amplifier Screen +12 V ±0.5 V

Table 9-2 Stand-by voltages.

TP15

T0116

127

+5V adjust

V01

U02

U01»+4.4V

U03

+10 to 13.5V

J16

C

D

E

»+8.2V

»+5.0V

»+10mV

AB

TP16

TP17

1

1P02

P01

Fig. 9-9 Test points and voltages for the power supply.

Page 87: Programmable Frequency Counter

Safety Components

Components in the primary circuits are important to the safety of the

instrument and may be replaced only by components obtained from

your local Fluke organization.

Check the Protective Ground Connection

Visually check the correct connection and condition and measure the

resistance between the protective lead at the plug and the cabinet.

The resistance must not be more than 0.5 . During measurement,

the power cord should be moved. Any variations in resistance shows

a defect.

Calibration Adjustments

Required Test Equipment

Preparation

WARNING: Live parts and accessible terminals which

can be dangerous to life are always exposed inside

the unit when it is connected to the line power. Use

extreme caution when handling, testing, or adjust-

ing the counter.

Before beginning the calibration adjustments, power up the instru-

ment and leave it on for at least 60 minutes to let it reach normal oper-

ating temperature.

Setup

– Connect the counter to the line power.

– Switch on the counter.

– Press PRESET, then press ENTER.

Adjustment

CAUTION: If you adjust the +5 V trimmer you have to

adjust the complete instrument.

– Connect the DMM between TP23 and ground, see Fig. 9-11.

– Adjust the +5 V trimmer potentiometer R50 in the power sup-

ply through the nearest vent in the protective cover, until the

DMM reads +5.00 ± 0.01 V.

– Check that the unregulated voltage from the power supply at

test point TP16=+15 is about +18 V.

– Check that the unregulated voltage from the power supply at

test points TP17=–7 is about –8 V.

Calibration Adjustments 9-7

Type Performance

DMM 3.5 digits

Table 9-3 Required Test Equipment.

0.2

0.4

0.6

0.8

1.0

1.1

1.2

V

2

4

6

8

10

12

V

1

2

3

V

2

4

6

8

10

12

V

100

200

300

400

V

500

V01 Gate

V01 dra in

U03 pin 7 RC

U03 pin 10 OUT

V01 S ource ( current )

0 2 4 86 10 uS

0 2 4 86 10 uS

0 2 4 86 10 uS

0 2 4 86 10 uS0 2 4 86 10 uS

A

C

B

D

E

Fig. 9-10 Typical curves of the power supply.

PowerModule

TP16

TP17

TP23

J18

+5V adjust

Fig. 9-11 Test points and trimmer for the power supply.

Page 88: Programmable Frequency Counter

Replacement Parts

Pos Description Part Number

Heat Sink 16°K/W TO220 5322 255 41313 P

Heat Sink 13.5°K/W TO220 5322 255 41314 P

C01 Capacitor 1 nF 5% 63V 4822 122 31746

C02 Capacitor 1 nF 5% 63V 4822 122 31746

C03 Capacitor 220 pF 20% 200V 5322 126 13129

C04 Capacitor 33 nF 10% 50V 4822 122 31981

C05 Capacitor 33 nF 10% 50V 4822 122 31981

C06 Capacitor 33 nF 10% 50V 4822 122 31981

C07 Capacitor 100 nF 10% 63V 4822 122 33496

C08 Capacitor 100 nF 10% 63V 4822 122 33496

C09 Capacitor 47 nF 10% 250V 4822 121 41676

C10 Capacitor 330 nF 20% 250V 5322 121 44222

C12 Capacitor 100 F 20% 35V 5322 124 40852

C13 Capacitor 220 pF 20% 200V 5322 126 13129

C14 Capacitor 100 pF 5% 63V 4822 122 31765

C15 Capacitor 22 pF 5% 63V 4822 122 32482

C16 Capacitor 4.7nF 10% 63V 4822 122 31784

C17 Capacitor 4.7nF 10% 63V 4822 122 31784

C18 Capacitor 100 nF 10% 63V 4822 122 33496

C19 Capacitor 100 nF 10% 63V 4822 122 33496

C20 Capacitor 100 nF 10% 63V 4822 122 33496

C21 Capacitor 470 F 20% 35V 2M 5322 126 13131

C22 Capacitor 470 F 20% 35V 2M 5322 126 13131

C23 Capacitor 10000 F 20% 6.3V 5322 124 80821

C24 Capacitor 1 nF 5% 63V 4822 122 31746

C25 Capacitor 100 nF 10% 63V 4822 122 33496

C26 Capacitor 100 nF 10% 63V 4822 122 33496

C27 Capacitor 100 nF 10% 63V 4822 122 33496

C28 Capacitor 220 pF 20% 200V 5322 126 13129

D01 Diode 7A BYW29/200 5322 130 32328

D02 Diode 7.5A MBR760 60V 5322 130 83602

D03 Diode 7A BYW29/200 5322 130 32328

D04 Diode 0.2A BAV23 200V 5322 130 33764

D06 Diode 0.35 W BZX84-C8V2 5322 130 80255

D07 Diode BYV26E DOD57 4822 130 60815

D08 Diode 0.35 W BZX84-C18 5322 130 80212

D09 Diode 0.2A BAV23 200V 5322 130 33764

D11 Diode 0.35 W BZX84-C18 5322 130 80212

D12 Diode 0.35 W BZX84-C18 5322 130 80212

D13 Diode 0.35 W BZX84-C8V2 5322 130 80255

D14 Diode 0.2A BAV23 200V 5322 130 33764

R01 Resistor 82 k 1% .125W 4822 051 10829

R02 Resistor 82 k 1% .125W 4822 051 10829

R03 Resistor 270 k 1% .125W 4822 051 10271

R04 Resistor 10.0 k 1% 0.125W 4822 051 51003

R06 Resistor 2.20 k 1% .125W 5322 116 80434

R07 Resistor 1.00 k 1% 0.125W 4822 051 51002

R08 Resistor 1.80 k 1% .125W 4822 051 10182

R09 Resistor 3.90 k 1% .125W 5322 116 80443

R10 Resistor 47 k 1% .125W 5322 116 80446

R11 Resistor 220 k 1% .125W 5322 116 80436

R12 Resistor 10.0 k 1% 0.125W 4822 051 51003

R13 Resistor 10.0 k 1% 0.125W 4822 051 51003

R14 Resistor 10.0 1% 0.125W 4822 051 51003

R15 Resistor 10.0 k 1% 0.125W 4822 051 51003

R16 Resistor 10.0 k 1% 0.125W 4822 051 51003

Pos Description Part Number

R17 Resistor 10.0 k 1% 0.125W 4822 051 51003

R18 Resistor 10.0 k 1% 0.125W 4822 051 51003

R19 Resistor 10.0 k 1% 0.125W 4822 051 51003

R20 Resistor 10.0 k 4822 051 51003

R24 Resistor 100 k 1% 0.125W 4822 051 51004

R25 Resistor 100 k 1% 0.125W 4822 051 51004

R26 Resistor 100 k 1% 0.125W 4822 051 51004

R27 Resistor 100 k 1% 0.125W 4822 051 51004

R28 Resistor 10.0 k 1% 0.125W 4822 051 51003

R29 Resistor 4.7 10% 0.25W 4833 051 10478

R30 Resistor 10.0 k 1% 0.125W 4822 051 51003

R31 Resistor 100 k 1% 0.125W 4822 051 51004

R32 Resistor 100 k 1% 0.125W 4822 051 51004

R33 Resistor 10.0 1% 0.125W 4822 051 10109

R34 Resistor 1.00 k 1% 0.125W 4822 051 51002

R35 Resistor 2.7 5% 0.25W 4822 051 10278

R36 Resistor 2.7 5% 0.25W 4822 051 10278

R37 Resistor 2.7 5% 0.25W 4822 051 10278

R38 Resistor 1.00 k 1% 0.125W 4822 051 51002

R39 Resistor 10.0 1% 0.125W 4822 051 10109

R40 Resistor 100 1% 0.125W 5322 116 80426

R41 Resistor 100 1% 0.125W 5322 116 80426

R42 Resistor 1.00 k 1% 0.125W 4822 051 51002

R43 Resistor 100 5322 116 80426

R44 Resistor 100 5322 116 80426

R45 Resistor 1.00 k 4822 051 51002

R46 Varistor 95V 95VRMS4.1J 5322 116 21222 P

R47 Resistor 4.70 k 1% .125W 5322 116 80445

R48 Resistor 10.0 k 1% 0.125W 4822 051 51003

R49 Resistor 22.0 k 1% .125W 5322 116 80435

R50 Potentiometer 1 k 20% 4822 101 10792

R51 Resistor 3.30 k 1% .125W 4822 051 53302

R52 Resistor 8.20 k 1% .125W 4822 051 10822

R53 Resistor 470 k 1% .125W 5322 116 80447

R54 Resistor 470 k 1% .125W 5322 116 80447

R55 Resistor 2.7 5% 0.25W 4822 051 10278

R56 Resistor 100 1% 0.125W 5322 116 80426

R57 Resistor 47 1% .125W 5322 116 80448

R58 Resistor 270 1% .125W 4822 051 10271

T01 Transformer 5322 148 20035 P

U01 IC-ref 2.5V TL431I-D SO8 5322 209 62422

U02 Optocoupler CNX82A 4822 130 10025

V02 Transistor 0.50 A BC807-25 5322 130 60845

V03 Transistor 0.50 A BC817-25 4822 130 42804

V04 Transistor 0.50 A BC817-25 4822 130 42804

V05 Transistor 0.50 A BC817-25 4822 130 42804

V06 Transistor 0.50 A BC817-25 4822 130 42804

V07 Transistor 0.50 A BC817-25 4822 130 42804

V08 Transistor 0.50 A BC807-25 5322 130 60845

9-8 Replacement Parts

Page 89: Programmable Frequency Counter

Replacement Parts 9-9

This page is intentionally left blank.

Page 90: Programmable Frequency Counter

Power Supply, Component layout

9-10 Replacement Parts

BOTTOM SIDE

TOP SIDE

Page 91: Programmable Frequency Counter

Power Supply

Replacement Parts 9-11

K RE

FA

CO

MP

VF

RC

VR

EF

SEN

SE

OU

T

1210 98 7

1 6 3 4

C01

1N

R0

1

82

D01

BY

W2

9F-2

00

D02

MB

R76

0

C02

1N

R0

2

82

C03

220

P

R0

3

270

D03

BY

W2

9F-2

00

D04

BAV

23

D04

BAV

23

C0

4

33N

C0

5

33N

R04

10K

C06

33N

R05

10K

1 25 4

U02

CN

X82

A

R06

2.2K

R07

1K

R0

8

1.8K

D0

6B

ZX

84C

8V2

C0

7

100N

1 86

U0

1

TL43

1I

R09

3.9

K

R1

0

47K

C0

8

100N

R1

1

220

K

C0

9

47N

-250

V

D07

BYV

26E

R1

2

10K

R13

10K

R14

10K

R15

10K

R16

10K

R1

7

10K

R1

8

10K

R19

10K

R20

10K

C10

330N

R2

41

00K

R2

51

00K

R26

100

K

R27

100

K

V01

BU

K446

R28

10K

D08

BZX

84C

18

D09

BAV

23

D09

BAV

23

R29

4.7

D11

BZX

84C

18C

12

100

U-3

5V

R3

0

10K

R31

100

KR

32

100

K

D12

BZ

X84

C18 D13

BZX

84C

8V2

C13

220P

R33 10

R3

4

1K

R3

52

.7R

36

2.7

R37

2.7

R38

1K C1

4

100

P

R3

91

0

V04

BC

817

D14

BAV

23

R40

100

R4

110

0

C15

22P

D1

4B

AV

23R

421K

V05

BC

817

R43

100

R44

100

C1

6

4.7

N

C17

4.7N

R4

5

1K

C1

8

100N

C1

9

100N

C2

0

100N

R4

6

C21

470

U-3

5V C22

470

U-3

5V C23

1000

0U

-6.3

V

R47

4.7K

R4

8

10K

C2

41

N

R49

22K

V03

BC

817

13

2

R5

01K

R51

3.3K

14

7 3 1

10 5

U03

UC

3842

A

C25

100

N

C26

100

N

11,1

2

8,9

51

P01

41 2 3 4 5 6 8 9 7

P0

2

C27

100N

R52

8.2K

V07

BC

817

V02

BC

807

R53

470

K

R54

470

K

R55

10

R5

61

00

R57

100

C28

220

P

R5

8

270

11

T01

V0

6B

C8

17

V08

BC

807

Page 92: Programmable Frequency Counter

PM6685R

Introduction

A Rubidium timebase is now available for the PM6685 Frequency

counter. This oscillator cannot be retrofitted in the standard version

of the PM6685. Due to the size of the timebase and its power require-

ments, a larger cabinet must be used.

A fan is needed to keep the temperature to an acceptable level.

This version is called PM6685R, where “R” stands for Rubidium.

Performance Check

Required Test Equipment

NOTE: To fully test the accuracy of the PM6685R, access to

an extremely high stability reference signal is needed,

for example a Cesium atomic reference or a transmit-

ted signal from a nationally or internationally traceable

source. Additionally the instrument has to be stabilized

for a period of one month.

The PM6685R is equipped with an LED labelled “UNLOCKED”.

When the LED is lit the Rubidium time base is still in its warm-up

phase and is not yet stabilized.

Test procedure

– Connect the counter to the line power.

– Check that the UNLOCK LED is lit.

– Check that the UNLOCK LED is switched off within 6

minutes after connection to line power.

– Connect a 10 MHz reference signal to input A of the counter.

– Select FREQUENCY A measurement.

– Select 1 s measuring time.

– Check that the displayed frequency is 10.00000000 MHz

±1 LSD < 6 minutes after connection to line power.

Functional DescriptionThe oscillator is supplied with 24 V from the extra power supply.

The oscillator generates a stable 10 MHz output frequency from a

20 MHz Voltage Controlled Crystal Oscillator (VCXO), whose fre-

9-12 Introduction

Type Performance Model

10 MHz reference 1x10-10

Calibrated Rubidium

oscillator or Cesium

atomic standard

Table 9-4 Required test equipment

MainPowerSupply

J3Fan

RubidiumTimebase

J4

P2

P3

J24

P1

Aux PowerSupply

1

Freq. Adj.

1

J31

1

Fig. 9-12 Location of the Rubidium Timebase and its power

supply.

Page 93: Programmable Frequency Counter

quency is locked to the atomic-standard “resonance frequency” of

the rubidium atom, see Fig. 9-14.

Amicrowave signal that is derived from the VCXO tunable oscillator

is applied to rubidium vapor contained within a heated glass cell.

Light from a rubidium lamp is passed through the cell and

illluminates a photo detector causing current to flow in the detector.

As the applied microwave signal approaches the frequency that cor-

responds to the ultra stable rubidium atomic resonance frequency, the

rubidium light entering the glass cell is absorbed by the rubidium va-

por to an increased extent causing a decrease in the photo detector

current. This “darkening” effect is used to generate an error signal

which permits continuous regulation of the quartz crystal oscillator

output frequency, thereby locking it to the frequency of the atomic

standard .

Calibration Adjustments

NOTE: Before Calibration Adjustment, the Rubidium time

base must have been in operation for more than 24

hours.

Required Test Equipment

Setup

– Connect the counter to the line power.

– Press PRESET, then ENTER.

– Press AUX.

Calibration Adjustments 9-13

Type Performance Model

10 MHz reference 1x10-10

Calibrated Rubidium

oscillator or Cesiumatomic standard

Table 9-5 Required test equipment.

A2RUBIDIUM

OSCILLATOR

TYPE LPRO

D1 UNLOCKED

UNIT 1J9

J10

SAFETY EARTH

5

3

2

1

3

12

90 to260v

CNT-85R REAR

PANEL

LINE

FILTER

FREQ.ADJUST

REAR VIEW

OF P3

3

J24

R11k

P3

1

2

3

4

5

6

7

8

9

10

A1AUX POWER

SUPPLY

5

4+24V

0V

P2

3

1

N

L

P1

1

2

9

10

0V

3

2

+24V

L1-L3

J3

J4

R23.83k

10 MHz

Fig. 9-13 Wiring diagram showing the interconnections between the Rubidium timebase, its power supply, and the main PCA.

PM6685R REAR

PANEL

Frequency multiplier/

Synthesizer

20 MHz Voltage tunable

Quartz Oscillator

(VCXO)

Feedback

electronics

(Servo)

DC-er ror

signal

DC correction

voltage

6.8 GHz

10 MHz output

Rubidium

lamp

Rubidium

cell

Detector

Fig. 9-14 Block diagram showing the principle of a Rubidium

Atomic Standard.

Page 94: Programmable Frequency Counter

– Select NULL by pressing or .

– Press ENTER twice.

– Set the measuring time to 10 s.

– Connect the 10 MHz reference to the input A of the counter.

Adjustment procedure

– Remove the seal from the front panel.

– Adjust the potentiometer beyond the seal until the display

reads 0.5-3

Hz or less.

– Check that the value is stable over time, (more than 30 min-

utes).

– Cover the “CALIBRATION ADJUSTMENT” hole on the front

panel with a relevant seal if necessary.

Replacement Parts

Pos Description Part Number

Cover, (incl. front part). 5322 447 92194 P

Fan 2822 031 01327 R

Text plate kit 4031 100 62440 R

Rear plate 4031 100 53930 P

A1 Power supply 5322 214 91268 P

D1 LED, HLMP-1300, red 5322 130 81921

L1 Toroid 5322 526 10545

L2 Toroid 5322 526 10545

L3 Toroid 5322 526 10545

P1-P3 Cable kit 4031 100 61530 P

R1 Potentiometer, 1 k 5322 101 11298

R2 Resistor 3.83 k, 1% 0.5 W MRS25 4822 050 23832

NOTE: The rubidium time base (unit A2) must be sent to a

Fluke service center for repair. Follow the exchange

procedure.

9-14 Replacement Parts