MODEL 171 SYNTHESIZER/FUNCTION GENERATOR · The Wavetek Model 171 Synthesizer/Function Generator is...

MODEL 171 SYNTHESIZER/FUNCTION GENERATOR

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MODEL 171

SVNTH ESIZE R /FUN CTI 0 N GENERATOR

© - 1982 - Wavetek

THIS DOCUMENT CONTAINS INFORMATION PROPRIETARY TO WAVETEK AND IS SOLELY FOR INSTRUMENT OPERATION AND MAINTENANCE. THE INFORMATION IN THIS DOCUMENT MAY NOT BE DUPLICATED IN ANY MANNER WITHOUT THE PRIOR APPROVAL IN WRITING OF WAVETEK.

WAVETE~ SAN DIEGO 9045 Balboa Ave., San Diego. CA 92123 P. 0 Box 651. San Diego. Calif. 92112 Tel 714/279-2200 TWX 910-335-2007

Manual Revision: 5/82 Instrument Release: L

WARRANTY

All Wavetek instruments are warranteed against defects in material and workmanship for a period

of one year after date of manufacture. Wavetek agrees to repair or replace any assembly or

component (except batteries) found to be defective, under normal use, during this period.

Wavetek's obligation under this warranty is limited solely to repairing any such instrument which in

Wavetek's sole opinion proves to be defective within the scope of the warranty when returned

to the factory or to an authorized service center. Transportation to the factory or service center

is to be prepaid by purchaser. Shipment should not be made without prior authorization by

Wavetek.

This warranty does not apply to any products repaired or altered by persons not authorized by

Wavetek, or not in accordance with instructions .furnished by Wavetek. If the instrument is

defective as a result of misuse, improper repair, or abnormal conditions or operations, repairs will

be billed at cost.

Wavetek assumes no responsibility for its product being used in a hazardous or dangerous manner

either alone or in conjunction with other equipment. High voltage used in some instruments may

be dangerous if misused. Special disclaimers apply to these instruments. Wavetek assumes no

liability for secondary charges or consequential damages and, in any event, Wavetek's liability for

breach of warranty under any contract or otherwise, shall not exceed the purchase price of the

specific instrument shipped and against which a claim is made.

Any recommendations made by Wavetek for use of its products are based upon tests believed to be

reliable, but Wavetek makes no warranty of the results to be obtained. This warranty is in lieu of

all other warranties, expressed or implied, and no representative or person is authorized to

represent or assume for Wavetek any liability in connection with the sale of our products other

than set forth herein.

SECTION 1

SECTION 2

SECTION 3

SECTION 4

SECTION 5

SECTION 6

SECTION 7

CONTENTS

INTRODUCTION

1.1 THEMODEL171.. .. . .. ... ... . .... .. ...... .. . . . . . . . . . . .. .. . . . . 1-1 1.2 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

INITIAL PREPARATION

2.1 UNPACKING INSPECTION........................ . . . . . . . . . . . . . . . 2-1 2.2 PREPARATION FOR USE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.3 ELECTRICAL ACCEPTANCE CHECK 2-1

OPERATION

3.1 CONTROLS AND CONNECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3.2 OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

3.2.1 3.2.2 3.2.3 3.2.4 3.2.5

Signal Termination .......................................... . Manual Function Generator Operation ............................. . Voltage Controlled Function Generator Operation ..................... . Synthesizer Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... . Monitoring the Synthesizer/Function Generator . . . . . . . . . . . . . . . . . . . . . . . .

CIRCUIT DESCRIPTION

3-3 3-3 3-3 3-4 3-4

4.1 FUNCTION GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4.2 FREQUENCY CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4.3 WAVEFORM OUTPUT.......................................... 4-2 4.4 OUTPUT ATTENUATOR AND PROTECTION CIRCUIT . . . . . . . . . . . . . . . . . . . 4-2 4.5 PHASE LOCK LOOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 4.6 SYNTHESIZER LOOP 4-2

CALIBRATION

5.1 FACTORY REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5.2 REQUIRED TEST EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5.3 REMOVING GENERATOR COVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5.4 CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

TROUBLESHOOTING

6.1 FACTORY REPAIR ........................................... . 6.2 TROUBLESHOOTING CHART ................................... . 6.3 TROUBLESHOOTING INDIVIDUAL COMPONENTS

PARTS AND SCHEMATICS

6-1 6-1

6-1

7.1 DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 7.2 ORDERING PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 7.3 ADDENDA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

SAFETY

This instrument is wired for earth grounding via the facility power wiring. Do no bypass earth grounding with two wire extension cords, plug adapters, etc.

BEFORE PLUGGING IN the instrument, comply with installation instructions.

MAINTENANCE may require power on with the instrument covers removed. This should be done only by qualified personnel aware of the electrical hazards.

The instrument power receptical is connected to the instrument safety earth terminal with a green/yellow wire. Do not alter this connection. (Reference: @or & stamped inside the rear panel near the safety earth terminal.)

WARNING notes call attention to possible injury or death hazards in subsequent operations.

CAUTION notes call attention to possible equipment damage in subsequent operations.

1.1 THE MODEL 171

The Wavetek Model 171 Synthesizer/Function Generator is a precision source of sine, triangle and square waveforms and de voltage. The generator combines the precision frequency of a synthesizer with the versatility and operating convenience of a function generator. The two major modes of operation are synthesizer and function generator.

Function generator output frequency can be varied from 0.1 Hz to 2 MHz in seven ranges manually by dial and remotely by an applied voltage. In addition to this analog control of frequency, the Model 171 has a 4 Yz digit switch for synthesizer control of function generator frequency:. The synthesizer gives precision (0.005%) frequency accuracy and stability (0.0001%/°C) from 1.000 Hz to 1.9999 MHz in six ranges. When the synthesizer is used to set the frequency, in addition to greater frequency accuracy and stability, the waveform purity is improved over that of the function generator alone.

Amplitude of the waveform is continuously variable from 10V peak-to-peak in a matching termination load (500 or 600n) down to 10 mV peak-to-peak in four ranges of attenuation (0, 20, 40, 60 dB). DC reference of the waveforms can be offset positively and negatively. The synthesizer can be locked to its own internal reference or to an external 1 MHz reference.

1.2 SPECIFICATIONS

The available waveforms, frequencies, amplitudes, operating modes, precision (accuracy) and purity (quality) are listed in the following paragraphs.

1.2.1 Versatility

Output Signals Sine '\, , triangle "'\..; , square 'L and DC selectable. TTL pulse n. , 1 MHz reference pulse n. and GCV signal proportional to output frequency are also available.

Control Generator operates in continuous mode. Frequency is controlled manually by dial or digital switch, or externally thru VCG input voltage. Digital switch is operable between 0.1000 and 1.9999 settings and works with all frequency multipliers except X 1.

SECTION 1 INTRODUCTION

Frequency Range 0.1 Hz to 2 MHz in seven overlapping ranges.

Operating Frequency Ranges

FREQMULT Range Digital Resolution x 1 0.1 Hz to 2 Hz N.A. x 10 0.1 Hz to 20 Hz 0.001 Hz x 100 0.2 Hz to 200 Hz 0.01 Hz X1K 0.2 Hz to 2 kHz 0.1 Hz

X 10K 20 Hz to 20 kHz 1.0 Hz X 100K 200 Hz to 200 kHz 10 Hz

X1M 2 kHz to 2 MHz 100Hz

NOTE

Digital switch valid with all frequency multipliers except X 1 (first range). Frequency ratio of 1000: 1 on dial, 20: 1 on digital switch.

Main Output \; , "'\..; , 1-i ; variable to 20V p-p into open circuit and

10V p-p with matching load at either 50n OUT or 600n OUT. DC offset of waveform (or DC if selected) is adjustable to ±10 volts open circuit and ±5 volts into matching load. Waveform plus offset is limited to ±1 OV peak (open circuit).

Output waveforms can be attenuated from 0 dB to 80 dB: 60 dB in 20 dB steps plus a 20 dB vernier for continuous variation (20 dB vernier does not affect offset or DC output).

Optional output protection circuit of zeners and fuses protect both output and common sides from inadvertent connection to external voltage or ac line.

DC Offset and DC Output DC offset of waveform and DC output are selectable and variable thru ±10V (±5V into matching load). Waveform plus offset is limited to ±10V peak (open circuit). Step attenuator attenuates de level.

Generator Frequency TTL Output TTL pulse has an approximately 50% duty cycle at generator frequency and can drive up to 20 TTL loads.

Optional TTL buffer circuit provides high power TTL compatible signal capable of driving load impedances as low as 50S1.

1-1

GCV (Generator Controlled Voltage) Output

0 to +2V (nominal, open circuit) proportional to frequency

of main generator. Output impedance 600!2.

VCG (Voltage Controlled Generatpr) Input

In function generator mode only, VCG voltage as well as

dial settings select generator frequency. Frequency may be

de-programmed 'or ac-modulated by external 0 to 2V signal.

Input impedance is 2 kil. VCG input can change generator

output 1000: 1 in function generator mode on all ranges

(limited by a minimum VCG frequency of 0.1 Hz).

VCG Input Signal Bandwidth: 100 kHz.

VCG Slew Rate: 0.1 V /µs.

External Reference Input

1 MHz sine or square wave external reference clock .signal

of 1 Vrms to 10 Vrms. 5 kil input impedance.

Reference Output TTL level 1 MHz pulse train output when in the synthesizer

mode.

Optional TIL buffer circuit provides high power TIL com

patible signal capable of driving load impedances as low as

son.

1.2.2 Operating Modes

Synthesizer Operates as a synthesizer with function generator outputs

locked to the synthesizer frequency. The frequency is deter

mined by the frequency multiplier switch and the digital

switch settings. The digital switch is operable from 0.1000

and 1.9999 on all ranges above the X 1 range.

Voltage Controlled Generator (VCG)

Operates as a conventional VCG. The frequency is controlled

by the dial, multiplier switch and external VCG voltage on

all ranges.

1.2.3 Horizontal Precision

Synthesizer Operation Accuracy: 0.005% of setting. Stability: 1 ppm per degree C. Internal Frequency Standard: 4 MHz crystal with an aging

rate of 20 ppm per year. Locking Time: Within 10% of final frequency in< 100 ms;

within 0.01% of final frequency on X 1 K, X lOK, X lOOK

and X lM ranges in< 300 ms, X 100 in< 2s, X 10 in< 20s.

DialNCG Operation

Dial Accuracy: ± 3% of full scale for 0.1 Hz to 200 kHz; ± 5% of full scale for 200 kHz to 2 MHz. Time Symmetry ± 1 % on al I ranges except X 1 M range.

1-2

1.2.4 Vertical Precision

Amplitude Change With Frequency (Sine)

Less than ±0.1 dB on all ranges thru X lOOK.

Less than ±0.5 dB on X lM range.

1.2.5 Waveform Purity

Harmonic Distortion Less than 0.5% to 20 kHz (typically 0.2%).

Less than 1.0% to 200 kHz (typically 0.5%).

All harmonics 30 dB below fundamental on X 1 M range.

Spurious Signals

Typically 70 dB below fundamental to 20 kHz and 40 dB

below fundamental to 2 MHz (in synthesizer mode only).

Integrated Signal to Phase Noise Typically 30 dB to 200 kHz measured over ±15 kHz band

width excluding carrier ±10 Hz (in synthesizer mode only).

Square Wave Rise and Fall Time

Less than 75 ns.

Triangle Linearity Greater than 99% to 200 kHz.

TTL Pulse Rise and Fall Time Less than 25 ns ( 15 ns typical).

1.2.6 Environmental

Specifications apply at 25°C ±5°C. Instrument will operate

from 0°C to +50°C.

1.2.7 Mechanical

Dimensions 11% in./28.6 cm wide;5% in./13.3 cm high; 10:Y.. in./27.3 cm

deep.

Weight 8.5 lb/3.85 kg net; 12 lb/5.5 kg shipping.

1.2.8 Power

90 to 110V, 105 to 125V, 180 to 220V or 210 to 250V; SO to 400 Hz; less than 18 watts.

NOTE

All specifications apply when frequency dial is

between 0. 1 and 2.0 or digi ta/ switch is between

0.1000 and 1.9999, amplitude is at 10V p-p and

output is from the 50!2 BNC into a 50!2 load.

2.1 UNPACKING INSPECTION

After carefully unpacking the instrument, inspect the exter

nal parts for damage to knobs, dials, indicators, surface areas,

etc. If there is damage, file a claim with the carrier who

transported the instrument. Retain the shipping container

and packing material for use in case reshipment is required.

2.2 PREPARATION FOR USE

Before connecting the instrument to line power, be sure the

rear panel 115/230V and HI/LO switches are set to the value

nearest the line voltage and that the fuse is correct for the

switch setting. Be sure that the plug on the power cord is

the proper mate for the line receptacle.

AC Line Voltage Switch A Switch B Fuse (SB)

90 - 110 115 LO 3/8 amp

105 - 125 115 HI 3/8 amp

180 - 220 230 LO 3/16 amp

210 - 250 230 HI 3/16 amp

2.3 ELECTRICAL ACCEPTANCE CHECK

This checkout procedure verifies the generator operation. If

a malfunction is found, refer to the Warranty in the front

of the manual. An oscilloscope, counter, three short lengths

of 50Q coax cable, a SQQ feedthru load and a 0 to ±2V

SECTION 2 INITIAL PREPARATION

voltage source are required (figure 2-1). Circled numbers

index controls and connectors to figure 3-1.

1. Preset the generator front panel controls as follows:

Control

Frequency Dial G) FREOMULT

Digital Switch © DC OFFSET

Waveform Selector

AMPLITUDE

ATTENUATION

Dial/Digital Switch

MODEL 171

0 son OUT ....

VCG lN

c'>

VOLTAGE SOURCE

• TTL OUT

®

@

Position

1.0 X1K

1.9999 OFF '\,

Full cw

0 Toward Dial

OSCILLOSCOPE

I I I I I

son I LOAD

I I ...,

COUNTER

Figure 2-1. Performance Checkout Setup

Table 2-1. Performance Checkout

Step

2

Control Position/Ope ration

Function

Adjust the oscilloscope for several cycles of sine

wave.

Waveform Selector "v I ~I DC,'\,

Amplitude

I AMPLITUDE Ccw to 12 o'clock

Observe

Waveform changes from '\, to "v to ~ to a OV

de level then '-1 .

Waveform amplitude reduces.

2-1

Step

2

3

2

3

4

s

2

3

4

5

6

Table 2-1. Performance Checkout (Continued)

Control

DC OFFSET

ATTENUATION

Outputs

Position/Operation

9 o'clock, then slowly to

full cw (return to OFF)

20, 40, 60 (return to 0)

Remove son load and reconnect cable. Remove

the SOO OUT connection and place it on the

6000 OUT BNC.

Remove the 6000 OUT connection and place it

on the TTL OUT.

Remove the TTL OUT connection and place it

on the REF OUT. Flip dial/digital switch selec

tor to digital switch side.

Remove the REF OUT connection and place it

on the GCV OUT.

Flip.dial/digital switch selector to dial side.

Frequency

Remove GCV OUT connection and place on

son OUT.

FREOMULT

Dial

Use each multiplier X 1

thru X 1 M (return to X 1 ).

Vary from 2.0 to .2 (return

to .2).

Connect a 0 to ±2V source to the VCG IN BNC.

Vary the voltage positively.

Dial 2.0

Observe

Waveform offset negatively, then positively (clipping

may occur).

Waveform amplitude decreases with each step.

Unloaded son OUT and 600n OUT are identical.

Square pulse at 1 kHz.

1 MHz pulse.

2 Vdc level.

1 Vdc level.

Observe an increase in frequency while stepping from

X 1 to X 1M.

Observe a corresponding change in frequency.

Observe a change in frequency proportional to the

change in VCG voltage.

Voltage Source Vary the voltage negatively. Observe a change in frequency proportional to the VCG

voltage.

7 Disconnect the voltage source.

8

9

2·2

Dial/Digital Switch Selector

Digital Switch

Switch toward the digital

switch.

Set each position of the

digital switch.

1.9999 kHz.

Observe counter readout corresponding to set of

digital switch.

3.1 CONTROLS AND CONNECTORS

The generator front panel controls and connections shown in figure 3-1 are keyed by circled numbers to the following descriptions.

Frequency Dial

When the frequency dial is selected by the dial/ digital switch selector @ the index @ lights and the frequency output is determined by the dial, FREQ MUL T @ and VCG @ voltage.

SECTION 3 OPERATION

@ Dial/Digital Switch Selector

Places the instrument in either function generator (dial controlled) or synthesizer (digital switch controlled) mode. Respective dial index @ or digital switch index @ lights to indicate operation mode.

@ FREQ MUL T (Hz)

Power is turned on when frequency range is selected at FREQ MULT. The multipliers are for the dial G) and digital switch @ readings and the VCG @ voltage.

3-1

© Digital Switch

When the digital switch is selected by the dial/digital switch selector @ the index @ lights and the frequency output is determined by the digital switch and the FREQ MUL T.

@ DC OFFSET

Rotating DC OFFSET clockwise past 12 o'clock offsets de output or de center reference of the output waveform positive; when counterclockwise, negative. When OFF, the de output is signal ground or the output waveform is balanced around signal ground (OV in figure 3-2).

TTL PULSE ov I __ _ __ I

TRIANGLE

SINE

SQUARE

®

®

3-2

w 1----1-- +--1---1 Figure 3-2. Output Waveforms

"v • "v , G and DC (Waveforms)

Sine '\, , triangle "v and square G waveforms are selected by the larger of the two concentric controls; the DC position provides a de voltage output controlled by DC OFFSET. Outputs appear at son OUT and 600n OUT.

AMPLITUDE

Rotating AMPLITUDE fully clockwise provides maximum peak-to-peak output at son OUT and 600n OUT; rotating counterclockwise gives up to 20dB attenuation. Also see ATTENUATION @. AMPLITUDE does not affect de offset or de output.

ATTENUATION

With a 600n load on the 600!1 OUT connector or a 50!1 load on the 50!1 OUT connector, output voltage for each attenuation is:

Attenuation

0 20 40 60

Amplitude Control Full cw Full ccw

10V p-p

1V P·P 100 mV p-p 10mV p-p

1V p-p 100 mV p-p 10 mV p-p

(Not specified)

@ Goon OUT and son OUT Connectors

@)

600n OUT and 50n OUT provide variable frequency and amplitude '\, , "v , G and DC. Maximumsignal amplitude is 10Vp-p with matching loads (20V p-p into open circuit).

TTL OUT Connector

A fixed amp I itude Transistor-Transistor Logic (TTL) square pulse train of the output frequency. (TTL levels are OV to 0.4V for a logic low and 2.4V to 5V for a logic high.) The output can drive up to 20 TTL loads. The pulse train can also be used as a synchronizing reference to 50!1 OUT and 600!1 OUT. Phase of output waveforms relative to the TTL pulse is shown in figure 3-1.

@ REF OUT Connector

A fixed amplitude Transistor-Transistor Logic (TTL) pulse train of 1 MHz whose orig~ an internal clock oscillator or, if indicator ~ is lit, the external reference signal of 1 MHz.

@ EXT REF IN Connector

Input for a 1 MHz sine or square wave external reference clock signal. The signal must be at least 1 Vrms. Synthesizer freque~ are referenced to this signal when indicator e is lit.

@ GCV OUT Connector

DC excursions at the Generator Controlled Voltage output (GCV OUT) of OV to about 2V proportionally represents frequency within the range indicated by FREQ MULT.

@ VCG IN Connector

DC excursions at the Voltage Controlled Generator input (VCG IN) proportionally control frequency within the range determined by FREQ MULT. Positive voltage increases the frequency set by the dial G) ; negative voltage decreases the frequency. Use in function generator mode only.

3.2 OPERATION

Operation is described as function generator operation and. synthesizer operation. The generator is ready to operate as soon as a frequency multiplier is selected.

3.2.1 Signal Termination

Proper signal termination, or loading, of the generator connectors is necessary for its specified operation. For example, the proper termination of the 500 OUT connector is shown in figure 3-3. Placing the 50 ohm terminator, or 50 ohm resistance, in parallel with a higher impedance, matches the receiving instrument input impedance to the generator output impedance, thereby mii:iimizing signal reflection or power loss on the line due to imp.edance mismatch.

MODEL 171

OUTPUT IMPEDANCE

son

RGS8 OR

RECEIVING INSTRUMENT

EFFECTIVE EQUIVALENT CIRCUIT

son RESISTANCE

Figure 3-3. Signal Termination

The input and output impedances of the generator connectors are listed below:

Connector Impedance

50n OUT 50n 600n OUT 600n TTL OUT *

REF OUT VCGIN 2kn

GCV OUT 600Q REFIN 5kQ

*The TTL OUT connector can drive up to 20 TransistorTransistor Logic (TTL) loads {low level between OV and 0.4V, and high level between 2.4V and 5V). REF OUT can drive up to 3 TTL loads. Addition of the TTL buffer option gives these outputs the capability of driving a 50Q load.

3.2.2 Manual Function Generator Operation

For basic operation, select the waveform frequency and amplitude. The following steps demonstrate manual control of the function generator. (Circled numbers are keys to figure 3-1.)

Step

2

3

Control/Connector

50UOUTor 600nOUT

Dial/Digital Switch Selector @

FREQ MULT

Setting

Connect circuit to either output (refer to paragraph 3.2.1 ).

Set toward the dial.

Set to desired range of frequency.

4 Frequency Dial G) .Set to desired frequency within the range.

5 Waveform Selector @ Set to desired waveform.

6

7

DC OFFSET

AMPLITUDE and ATTENUATION

Set as desired. Limit waveform amplitude to prevent clipping (see figure 3-4).

Select for desired amplitude.

+5V -

~ TRIANGLE

WAVEFORM INTO A MATCHED

LOAD

<fiV-1\fv--5V- - - -

POSITIVE DC OFFSET

<fiV~w

-5V- - - -EXCESSIVE POSITIVE

OFFSET OR

ov -

-5V - - ODC -

OFFSET

_Aj1_ NEGATIVE DC OFFSET

M_ EXCESSIVE NEGATIVE

OFFSET OR LOADING LOADING

Figure 3-4. DC OFFSET Control

3.2.3 Voltage Controlled Function Generator Operation

Operation as a voltage controlled function generator (VCG) is as for a manually controlled function generator, only the frequency within particular ranges is additionally controlled with de levels (±2V excursions} injected at the VCG IN connector. Perform the steps given in paragraph 3.2.2, only set the frequency dial to determine a reference from which the frequency is to be voltage controlled.

3-3

1.

2.

3.

For frequency control with positive de inputs at VCG IN, set the dial for a lower frequency limit.

For frequency control with negative de inputs at VCG IN, set the dial for an upper frequency limit.

For modulation with an ac input at VCG IN, set the dial at the desired center frequency. Do not exceed the maximum dynamic range of the selected frequency range.

Figure 3-5 is a nomograph with examples of dial and voltage effects. Example 1 shows that with OV VCG input, frequency is as determined by the main dial setting, 1.0 in this example. Example 2 shows that with a positive VCG input, output frequency is increased. Example 3 shows that with a negative VCG input, output frequency is decreased. (Note that the Output Frequency Factor column value must be multiplied by a frequency range multiplier to give the actual output frequency.)

MAIN DIAL SETTING

2.0

1.8

1.6

1.4

1.2

1.0 -"' ' .8

.6

.4

.2

--' '

VCGIN VOLTAGE

OUTPUT FREQUENCY

FACTOR .002 -2.0

-1.6 . 2

-1.2 .4

.6 - .8 ""~\..~;.. ~"/..~ -

- .4_.. .8

-0 EXAMPLE 1 - - - 1.0

+ .4 1.2

' + .8 1.4

' 1.8

+1.2 '~+ ,~~

,:oo< +1.6 ~..?

1.6

' ' .002 +2.0 2.0

Figure 3-5. VCG Voltage-to-Frequency Nomograph

NOTE Nonlinear operation results when the VCG input voltage is excessive; that is, when the attempted generator frequency exceeds the range setting (2 times the multiplier setting) or in the other direction, 1 /1000th of the range setting.

The up to 1000: 1 VCG sweep of the generator frequencies available in each range results from a 2V excursion at the

3.4

VCG IN connector. With the frequency dial set to 2.0, excursions between -2V and OV at VCG IN provide the up to 1000: 1 frequency sweep. With the dial set to .002, excursions between OV and +2V at VCG IN provide the up to 1000: 1 sweep within the set frequency range.

3.2.4 Synthesizer Operation

For synthesizer operation, select the waveform, frequency and amplitude. The following steps demonstrate synthesizer control. (Circled numbers are keys to figure 3-1.)

Step

2

3

4

5

6

7

Control/Connector

50f2 OUT or 6000 OUT

Dial/Digital Switch Selector @

FREQ MULT

Digital Switch @

Waveform Selector@

DC OFFSET

AMPLITUDE and ATTENUATION

Setting

Connect the circuit to either output (refer to paragraph 3.2.1 ).

Set toward digital switch.

Set to desired range of frequency.

Set to desired frequency within the range .

Set to desired waveform.

Set as desired. Limit waveform amplitude to prevent clipping (see figure 3-4).

Select desired amplitude.

Synthesizer frequencies are normally referenced to an internal crystal oscillator. However, an external 1 MHz sine or square wav~erence signal can be applied at REF IN; the indicat~r e will light, indicating a proper external reference in use.

3.2.5 Monitoring the Synthesizer/Function Generator

Besides the 50f2 OUT and 600f2 OUT main generator outputs, the GCV OUT connector supplies a voltage proportional to the generator frequency, the TTL OUT connector supplies a TTL compatible pulse train at the generator frequency, and the REF OUTsuppliesaTTLcompatible lMHz pulse train.

The GCV OUT signal is used to drive the frequency axis of an X-Y recorder or oscilloscope; the generator frequency TTL OUT signal is used to synchronize other devices to the generator or to drive TTL level inputs, and the REF OUT signal is used to reference other 171 's to a master crystal oscillator.

FREQ DIAL

+ FCTN GEN/

SYNTHESIZER

~VCGIN

4-0

POSITIVE CURRENT SOURCE

NEGATIVE CURRENT SOURCE

/ /

/ FREQ

MULTSW

/ /

GCV AMPLIFIER

/ /

/ /

/ 'L

PHASE DETECTOR

DIODE GATE

FREQ MULTSW

/ 1 / / ~ ~

HYSTERESIS SWITCH

TTL SYNC

....._ ______ SYNTHESIZER LOOP

FREQUENCY CREF)

Figure 4-1. Function Generator Block Diagram

SINE CONVERTER

'\,

~ lDC AMPLITUDE

+

DC OFFSET

SOU ARE SHAPER

soon

OUTPUT OUTPUT

PROTECT ATTN

(OPTION)

TTL BUFFER

GCV OUT

~

son OUT

~ OUT

~

TTL OUT

(OPTION) t-----------.n

4.1 FUNCTION GENERATOR

As shown in figure 4-1, the VCG summing amplifier sums the currents from the frequency dial and VCG input connector in function generator mode or from the low pass filter output and the .frequency-to-voltage (F/V) converter output in synthesizer mode. The low pass filter is part of the generator frequency .phase lock loop which provides a feedback current that corrects generator frequency to be exactly that of the synthesizer loop output. (Phase lock loop operation is described in paragraph 4.5.) The F/V input is also from the synthesizer loop and provides a gross correction to increase the response time of the generator to changes in synthesizer frequency programming.

The VCG summing amplifier is a noriinverting buffer whose output current is used to control a positive current source and a negative current source. The currents from the two current sources are equal and opposite polarity and the magnitudes are directly proportional to the current of the VCG summing amplifier output. The diode gate, which is controlled by the hysteresis switch, is used to switch the positive current or the negative current to the integrating capacitor selected by the frequency multiplier. If the positive current is switched into the capacitor, the voltage across the capacitor will increase linearly to generate the positive slope of the triangle wave. If the current is negative, the voltage across the capacitor will decrease linearly to produce the negative slope.

The triangle buffer amplifier is a unity gain amplifier whose output is fed to the hysteresis switch as well as to the sine

SECTION 4 CIRCUIT DESCRIPTION

generates the triangle waveform as shown in figure 4-2. Since the output of the hysteresis switch is a square wave, the result is simultaneous generation of a square wave and triangle wave at the same frequency.

+1.25V- - -

-1.25V I

I

+2V 1

-2V

HYSTERESIS

converter. The hysteresis switch has two voltage limit points Figure 4-2. Generator Loop and Waveforms (+1.25V and -1.25V). (See figure 4-2.)

During the time the output voltage of the triangle buffer amplifier is increasing, the output voltage of the hysteresis switch is positive, but when the output voltage of the triangle amplifier reaches +1.25V, it triggers the hysteresis switch causing the switch output to become negative. Once the control voltage into the diode gate becomes negative, it will switch the positive current out and switch the negative current in to the integrating capacitor, starting a linear decrease of the voltage across the capacitor. When the decreasing voltage reaches -1.25V, the output of the hysteresis switch will switch back to positive, reversing the process. This action

4.2 FREQUENCY CONTROL

The output frequency is determined by the magnitude of the integrating capacitor selected by the frequency multiplier and the magnitude of the positive and negative current sources (figure 4-1). Since the current magnitudes are linearly proportional to the sum of the VCG current, the output frequency will also be linearly proportional to the current sum.

By using current division, the magnitude of the capacitor is effectively increased, allowing the generation of lower fre-

4-1

quencies. Figure 4-3 is the simplified diagram showing current -divider· operation. By reducing integration current precisely. by a factor of 10 while holding triangle wave amplitude constant, it is possible to extend the lower frequency range by a factor of 10 with fixed capacitance C. Since points A and 8 are at the equipotential points, constant current output I can be divided by resistance ratio of R and 9R. Then, integration current of capacitor C is reduced to 0.1 I. The lower current extends the frequency range of the function generator by a factor of 1 O~ The same theory is applied to extend the frequency range by a factor of 100.

4.3 WAVEFORM OUTPUT

The inverted output of the hysteresis switch is fed to the TTL buffer amplifier and also the square wave shaper (figure 4-1 ). The square wave shaper consists. of a shaping circuit which limits the output swing to ±1.25 volts.

The output signal from the triangle buffer amplifier is applied to the sine converter, which uses a diode-resistor network with nonlinear sections to shape a sine wave.

The sine, triangle or square waveform isfed to the summing amplifier through the waveform selector switch. The output of summing amplifier is fed through the amplitude control to the output amplifier. The output amplifier is an inverting amplifier whose output is capable of driving 10V p-p into selected load impedance.

SQUARE WAVE

+I

-I

Figure 4-3. Current Divider

TRIANGLE

B WAVE

4.4 OUTPUT ATTENUATOR AND PROTECTION CIRCUIT

The signal from the output amplifier is routed through an attenuation network for step attenuation. If the optional protection circuit is installed, the instrument output circuits are protected from input voltages by a zener and fuse network protecting both the signal and ground sides of the output BNC's. Two source impedances, 50 and 600 ohms, are provided at the outputs.

4-2

4.5 PHASE LOCK LOOP

A phase lock loop is shown in figure 4-4. The phase detector output is proportional to the difference in frequency between the two inputs. This difference signal is used to control a voltage controlled oscillator (VCO). The VCO output signal is fed back to the phase detector, where th~ VCO frequency is compared to the reference input to the detector. This reference input is, for example, a constant 1.0000 kHz signal. The loop becomes stable when the VCO frequency equals the reference frequency, at which time the detector difference signal becomes zero.

REFERENCE PHASE

DETECTOR ~----&FILTER

Figure 4-4. Phase lock loop

4.6 SYNTHESIZER LOOP

VCO

The reference frequency for the synthesizer is provided by an internal 4 MHz crystal or by an external 1 MHz signal (figure 4-5). Either source provides a 1 MHz REF OUT signal which is also reduced to 1.0000 kHz for the reference input to the phase detector.

The phase detector difference signal is a pulse train whose spacing and magnitude reflect the phase difference. The low pass filter ( LPF) shown in the synthesizer loop converts this pulse train to a voltage inversely proportional to the phase difference. Noise, particularly 1 kHz, is filtered by the 400 Hz cutoff filter. The de voltage controls the VCO frequency using a varactor diode as the tunable element.

The programmable divider in the loop (7 P) is controlled by the front panel digital switch; for any division of frequency programmed, the loop rapidly drives the phase detector's other input to 1.0000 kHz. For example, if divide by 16000 is programmed, an imbalance is initially set up and the VCO frequency is increased such that f vco-=- 16000 = 1.0000 kHz, which returns the loop to a stable condition. (The VCO frequency (fvco) was 16 MHz.)

The VCO has a tunable range of only 3: 1, hence the VCO range has been limited to 8 to 20 MHz. When below 8 MHz from the VCO would be required,a prescaler is placed in the loop, which is also controlled by the digital switch, to keep the division factor large, which in turn keeps VCO frequency greater than 8 MHz. The prescaler output is a 1 M to 20 MHz signal. The output of the prescaler is divided by 10 before the frequency rangingcircuitto give the frequency equivalent to the digital switch programmed value. The resulting fre-

quency 1s divided by a multiple of 10, as controlled by the FREQ MU LT range switch, and fed to the function generator phase lock loop (figure 4-1).

A 1 Ok to 200 kHz output is used to create the F N signal which gives rapid function generator response to frequency changes. A one-shot changes the signal to fixed width pulses whose spacing is frequency dependent. These are converted

CLK KILL

XTALOSC/ +4 PHASE

to a frequency dependent voltage level at the F N converter output.

One pole of the function generator/synthesizer mode switch furnishes the ground signal CLK Kl LL. CLK Kl LL stops synthesizer loop activity when the instrument is in function generator mode or set on X 1, a dial-only range. Lamps indicating mode are also controlled by this CLK KILL.

REF OUT

TTL BUFFER 1 MHz

~ (OPTION)

5V REG

1.0000 kHz DETECTOR

1 MHz

EXT/INT REF

SELECTION +1000

~ 1 MHz

EXT REF IN

FCTN GEN

~CLK V e - ..-- KILL

SYNTHE-SIZER

1.0000 kHz

0.1000 - 1.9999

DIGITAL SWITCH

20 Hz LPF

FN FN ONE- 10k • 200 kHz CONV SHOT

FCTN GEN

CLK ·I INDICATOR

I ~ 1+26V

Kill SELECTOR

SYNTHESIZER

1M-20MHz

+10

+10R FREQUENCY

RANGING R • 0-5

FREQ MULT

SW

Figure 4-5. Synthesizer Phase Lock Loop

CLK KILL 8M-20MHz

SYNTHESIZER LOOP FREQUENCY (REF)

4-3

5.1 FACTORY REPAIR

Wavetek maintains a factory repair department for those customers not possessing the necessary personnel or test equipment to maintain the instrument. If an instrument is returned to the factory for calibration or repair, a detailed description of the specific problem should be attached to minimize turnaround time.

5.2 REQUIRED TEST EQUIPMENT

DVM (3% digit)

Distortion Analyzer ( 1% F.S.) HP334A

Oscilloscope (~ 40 MHz bandwidth, X 10 horizontal magnification, de triggering to 1 Hz)

BNC Termination (500 ~ 1%, ~ 1W)

Frequency Counter (6 digits, time base accuracy~ 50 ppm)

Low Frequency Spectrum Analyzer HP3580A

5.3 REMOVING GENERATOR COVER

For main board access, remove the four screws in the lower cover, place the instrument on its feet and lift off the top cover. For later access to the synthesizer board, remove the four screws from the inside corners of the lower board that attach it via standoffs to the lower cover. Do not remove the lower cover unless necessary, because it supports front and rear panels.

SECTION 5 CALIBRATION

5.4 CALIBRATION

After referring to the following preliminary data, perform calibration, as necessary, per table 5-1. If performing partial calibration, check previous settings and adjustments for applicability.

1. Unless otherwise noted, all measurements made at the 500 OUT connector should be terminated into a 50U (~ 1%, 1W) load.

2. Before connecting the unit to an ac source, check the ac line circuit to make sure the 115/230 volt switch is set at the correct position (see paragraph 2.2).

3. Start the calibration by setting the front panel switches as follows:

Dial .................................. 2.0 FREOMULT ......................... X 1K Mode (toggle switch) . . . . . . . . . . . . . . . Toward Dial Digital Switch . . . . . . . . . . . . . . . . . . . . . . . . 0.1000 DC OFFSET ........................... OFF Function .............................. DC AMPLITUDE . . . . . . . . . . . . . . . . . . . . . . . . . . ccw ATTENUATION .......................... 0

4. Allow the unit to warm up at least 30 minutes for final calibration. Start the calibration on main board. All test points are located on the main board.

Table 5-1. Calibration Chart

Cal Control Desired Step Check Tester Points Settings Adjust Results Remarks

1 Power DVM TP2(TP1 R20 +15 ±0.01V Main board supply ground)

- regulation 2 TP3(-15V) -15 ±0.05V

3 Output Scope or DVM 500 OUT R116 0 ±0.01 Vdc - de

4 balance AMPLITUDE: cw R141

5-1

Table 5-1. Calibration Chart (Continued)

Cal Control Desired

Step Check Tester Points Settings Adjust Results Remarks

5 Distortion Distortion ana- 500 OUT Function '\, R72 Minimum distortion

lyzer (500 termi- R93

nated

6 VCG null Scope FREQMULT: X 100K R40 Minimum frequency Adjust generator dial

Function:~ shift to display one cycle

Dial: full cw on scope. Alternately

Scope vert: 2V /div short and open VCG

Scope horiz: .5ms/div IN BNC while adjust-ing R40.

7 Horizontal Scope Horiz: X 10 on R42 Maximum symme- Alternately switch

symmetry try scope triggering from positive to negative slope while adjusting R42.

-8 Dial: 01 R60

FREQ MUL T: X 10 Scope sweep: 0.1s/div, de triggering

9 Frequency Counter Dial: 2.0 R32 Best frequency ac-

accuracy FREQ MUL T: X 1 curacy over X 1

thru X 10K thru X 10K

-10 FREQ MULT: X 1M C37 2.020 MHz

Function: Li Dial: 2.0

-11 Function: Li, ~."v Best frequency

tracking on X 1 M range

12 Internal REF OUT Mode toggle switch: Cl 1 MHz ±20 Hz C 1 is on synthesizer

reference towards digital switch board.

13 FNbal- Scope or DVM TP5 (TP1 FREQ MULT: X 10K R31 0 ±0.1 Vdc

ance common) Digital Switch: 0.1000

14 FN gain Digital Switch: 0.9999 R28 +1 Vdc approx

-15 Digital Switch: 1.9999 -1 Vdc approx If necessary, reset

R28 for best balance between 0.9999 and 1.9999.

16 Frequency Counter 500 OUT FREQ MULT: X 1M Reading ±0.005%

range thru X 10 each setting

Function: Li

5-2

Table 5-1. Calibration Chart (Continued)

Cal Control Desired Step Check Tester Points Settings Adjust Results Remarks

17 Frequency Counter 50Q OUT FREQ MUL T: X 10K Proper bits Digital Switch: 0.1111 reading on

thru 0.9999 counter

18 Spectral Spectrum Function:~ Spurious signals Set 3580A controls purity Analyzer Digital Switch: 1.9999 below-70 dB. for a 3 Hz band-

Noise floor be- width with min-low-60 dB- mum smoothing;

scanning 20 Hz/div at 5s/div. Check that average of noise floor at f 0 + 3 Hz is below --60 dBc and that no line related spurs are above -70 dBc. Keep power lines away from analyzer input.

5-3

6.1 FACTORY REPAIR

Wavetek maintains a factory repair department for those customers not possessing the necessary personnel or test equipment to maintain the instrument. If an instrument is returned to the factory for calibration or repair, a detailed description of the specific problem should be attached to minimize turnaround time.

6.2 TROUBLESHOOTING CHART

·Troubleshooting charts are given in figures 6-1 thru 6-4. The charts do not cover every possible trouble, but will be an aid in systematically isolating faulty components.

Figure 6-1. Initial Checks

Figure 6-2. Generator Mode Checks

Sheet 1 Generator Check Sheet 2 Generator Loop Check Sbeet 3 VCG Check

GCV Check TTL Check

Figure 6-3. Power Supply Checks

Figure 6-4. Synthesizer Mode Checks

Sheet 1 F N Check Sheet 2 Synthesizer Loop Checks Sheet 3 Synthesizer Loop Checks _Sheet 4 Frequency Ranging Check Sheet 5 Generator Phase Lock Loop Check Sheet 6 Reference Selector Check

6.3 TROUBLESHOOTING INDIVIDUAL COMPONENTS

6.3.1

1.

Transistor

A transistor is defective if more than one volt is measured across its base emitter junction in the forward direction.

2.

3.

4.

5.

SECTION 6 TROUBLESHOOTING

A transistor when used as a switch may have a few volts reverse bias voltage.

If the collector and emitter voltages are the same, but the base emitter voltage is less than 500 inV forward voltage (or reversed bias), the transistor is defective.

A transistor is defective if its base current is larger than 10% of its emitter current (calculate currents from voltage across the base and emitter series resistors).

In a transistor differential pair (common emitter stages), either their base voltages are the same in normal operating condition, or the one with less forward voltage across its base emitter junction should be off (no collector current); otherwise, one of the transistors is defective.

6.3.2 Diode

1. A diode is defective if there is greater than one volt (typically 0.7 volt) forward voltage across it.

6.3.3 Operational Amplifier (e.g., UA741C, LM318)

1. The "+" and "-" inputs of an operational amplifier will have less than 15 mV voltage difference when operating under normal conditions.

2. If the output voltage stays at maximum positive, its "+" input voltage should be more positive than its "-" input voltage, or vice versa; otherwise, the operational amplifier is defective.

6.3.4 Capacitor

1. Shorted capacitors have zero volts across their terminals.

2. Opened capacitor can be located (but not always) by using a good capacitor connected in parallel with the capacitor undertestand observing the resulting effect.

6-1

BOTH 6oo!l OUT & 5oi10UTBAD

SELECT GEN MODE WITH DIAL AT 2.0

6-2

SELECT SYNTHESIZER

MODE

PURITY BAD

NOTE: Unless o'therwise indicated, test points and designations apply to syn'thesizer

(lower) board and digital switch settings are between 0. 1000 and 1.9999.

CHECK

~----.. GENERATOR MODE (FIGURE 6-2)

/'-.. VOLTAGE

ATTPS (APPROX CHECK VARY DIGITAL SWITCH

SETTING

1------< 0.5 TO 5V) PROPOR- >-----.i FN (FIGURE6-4,SHEET 1

CHECK SYNTHESIZER LOOP

(FIGURE 6-4, SHEET 2)

CHECK GENERATOR

PHASE LOCK LOOP (FIGURE 6-4, SHEET 5)

TIONAL TO DIGITAL: SWITCH SETTINGS

7

YES

CONNECT PROBE TOTPSON

GENERATOR BOARD

PROBLEM IN IC13 OR IC10- 12

CIRCUITS

Figure 6-1. Initial Checks

COMPLETE STEPS 12-14

ON CALIBRATION PROCEDURE

GENERATOR PHASE LOCK LOOP

(FIGURE 6-4, SHEET 5)

TURN DC OFFSET

OFF

SELEC"

"v

CHECK GENERATOR

LOOP (SHEET 2)

GENERATOR CHECK

NOTE: Unless otherwise indicated, test points and designators apply to generator

(upper) ·board and mode selector is in generator mode.

CHECK IC11

CIRCUIT

CHECK SW2A&B

& IC8CKT

REINSTALL R111

CHECK R110

1 ..... NO

CHECK CR17 - 20

& 015 CKT

,,,,........ APPROX ±1V '\;

AT R110WIPER WITH AMPLITUDE

CW?

REMOVE R111

APPROX ±1V '\;

AT R110 WIPER WITH AMPLITUDE

CW? '-..-../'

SET WAVEFORM

TO~

CHECK 016- 22 CIRCUIT &

OUTPUT A TTEN

(SYNTHESIZER BO)

REINSTALL R111

Figure 6-2. Generator Mode Checks (Sheet 1 of 3)

CHECK CR17- 20

&SW2 A& B

6-3

GENERATOR LOOP CHECK

N0±1.25V '\/ ATPIN 6 IC6

~ REGULATED NO 115/220V SWITCH YES < +&-15Vdc ~ &POWER ~ AT TP2 & TP3 CONNECTION

? Q!S} YES

ROTATE DIAL FROM TOP

TO BOTTOM ( +15V T0"""15 mV

SHIFT AT E9 ? Jves

ROTATE DIAL;

< OVdcWITH NO SHIFT

AT PIN 3 IC4 7

'j;YES

ROTAT\ DIAL; APPROX -15V

T0-10V SHIFT AT <PINS 7,4, 2 & +15V

TO +10V SHIFT AT PINS 10

13 IC5?

l. YES

"'±2 Vdc AT JUNCTION

< CR9, 10 & -+1.25 Vdc* AT JUNCTION

CR11 12 7

-~de ON C24 (+)

&"""-24 Vdc ONC23 (-)

?

DIAL POTENTIO

METER BAD

PROBLEM IN IC4

CIRCUIT

PROBLEM IN IC5

CIRCUIT

CHECK CR13, 14

CHECK POWER SUPPLY

~-- REGULATOR (FIGURE 6-3)

CHECK 012 - 15 >----... CR15, 16 & IC7

CIRCUIT

CHECK XFMR

CHECK 012 - 15 CR15, 16 & IC7

CIRCUIT *The top or bottom of the square and triangle waveforms, which indicates a locked up generator.


6-4

"VCG IN" DOES NOT CHANGE FREQUENCY

"TTL SYNC"

BAD

"GCVOUT" BAD

VCGCHECK

/'-..... SUM OF DIAL

VCG IN & SWEEP EXCEEDING

OVERRAN GE LIMIT { ..... 50%)

?

ILLEGAL OPERATION

GCVCHECK

TTL CHECK

COAX E38,39

OK ?

CHECK E33,34 WIRING & R37

CHECK 011

CIRCUIT


REPLACEICS OR. IF TTL

BUFFER OPTION INSTALLED, IC33

ON SYNTH BD

6-5

POWER SUPPLY REGULATOR CHECK

NO REGULATED+& -15 Vdc AT TP2 & TP3;

FUSE OK

NOTE: Test points and designators apply ' to generator (upper) board.

NO

-15 Vdc REGULATOR IS ASSUMED TO BE

DEFECTIVE

6-6

YES

-15 Vdc REGULATOR IS ASSUMED TO BE IN CURRENT-LIMIT

MODE

ISOLATE LOW Z BY LIFTING -15V

JUMPERS

+15 Vdc REGULATOR IS ASSUMED TO BE

DEFECTIVE

Figure 6-3. Power Supply Checks

YES

NO+SV AT J1-2

CHECK VR1 CIRCUIT

+15 Vdc REGULATOR IS ASSUMED TO BE IN CURRENT-LIMIT

MODE

ISOLATE LOW Z BY LIFTING +15V

JUMPERS

FNCHECK

NOTE: Unless otherwise indicated, test points and designations apply to synthesizer (lower) board and digital switch settin!}s are between 0. 1000 and 1.9999.

OLTAGE AT TP8 (APPRO 0.5 TO 5V) NOT PROPOR

TIONAL TO DIGITAL SWITCH SETTINGS

-FREQUENCY FREQUENCY AT PIN 4 IC20 (10k - AT PIN 11 IC14 (1M - CHECK 200 kHz) PROPOR-~ 20 MHz) PROPOR- NO ... SYNTHESIZER LOOP

<TIONAL TO DIGITA~ TIONAL TO DIGITAL ~---1 .... - (SHEET 2) SWITCH SETTINGS SWITCH SETTINGS

'fvEs NEGATIVE PULSES AT PIN 6 IC20 (10k -

< 200 kHz) PROPOR=nONAL TO DIGITAL

SWITCH SETTINGS ?

YES

POSITIVE PULSES < (10k- 200 kHz) AT COLLECTOR OF 06 .,

~s POSITIVE

DC SIGNAL AT

<PIN 6 IC21 PROPORTIONAL TO DIGITA

SWITCH SETTINGS

CHECK IC25

CIRCUIT

? YES

CHECK IC20

CIRCUIT

CHECK Q5,6

CIRCUIT

CHECK IC21

CIRCUIT

FREQUENCY ATPIN 11 IC15 (100k -

<. 2 MHz) PROPOR:Y-IONAL TO DIGITAi:::

SWITCH SETTINGS ?

YES

CHECK IC15

CIRCUIT

Figure 6-4. Synthesizer Mode Checks (Sheet 1 of 6)

CHECK IC14

CIRCUIT

6-7

REOUENCYINCORRECT ATPIN 11 IC14 OR TP5

OF SYNTHESIZER BOARD

+5V AT PIN 2 J1.

<+15V AT PIN 9 J4 & -15V AT PIN 8

7

YES

SYNTHESIZER LOOP OK

CHECK FREQUENCY RANGING (SHEET 4)

6-8

SYNTHESIZER LOOP CHECK

CHECK POWER SUPPLY

(FIGURE 6-3)

CHECK IC1. 2

CIRCUIT

YES

CONTINUE TO

SHEET 3

CHECK 01. 2 & XTAL

CIRCUIT (C1 ADJUSTMENT)

CHECK 08.9

CLK KILL CIRCUIT

CHECK REFERENCE SELECTOR (SHEET 6)

CHECK IC5

CIRCUIT


READ OPERATING

INSTRUCTIONS

CHECK IC3

CIRCUIT

CHECK IC4

CIRCUIT

CONTINUED FROM

SHEET2

SYNTHESIZER LOOP CHECK (CONTINUED)

-+2.sv AT0.1000 YES LOOP RUNNING < &-+12V AT 1.9999 ,__ ____ CHECK FREQUENCY

Dl'GITAL SWITCH SETTI RANGING AT PIN 6 IC10 (SHEET 4)

? NO

LOOP LOCKED

UP

CHECK IC9, 10

CIRCUIT

CHECK IC23,24

CHECK IC23, 24

REPLACE IC28

REPLACE

IC32

NO

CHECK IC11, 12 CIRCUIT

REPLACE IC29

CHECK IC13 & VR1 CIRCUITS

NOTE FREQUENCY {F) FOR FOLLOWING

CHECKS

SET DIGITAL SWITCH

TO 1.9999

REPLACE IC30

CHECK IC22,26,27

Figure 6-4. ~ynthesizer Mode Checks (Sheet 3 of 6)

YES

SET DIGITAL SWITCH 0.4000 0.2000 0.1000

SET DIGITAL SWITCH

TO 0.8000

VERIFY ATPIN6

IC24 (FREQUENCY)

1/2 F 1/4 F 1/8 F

REPLACE IC31

6·9

SYNTHESIZER LOOP RUNNING BUT

FREQUENCY BAD

SET DIGITAL SWITCH

TO 1.0000

6-10

FREQUENCY RANGING CHECK

CHECK >----- SYNTHESIZER l;..OOP (SHEET 21

REPLACE IC14

REPLACE IC15

REPLACE IC16

CHECK GENERATOR

PHASE LOCK LOOP (SHEET 5)


REPLACE IC17

CHECK IC18, 19

FREQ OR PURITY ON ONE OR MORE

RANGES BAD

SELECT A BAD RANGE

CHECK TPSON GEN BD

NO

REPLACE IC10

GENERATOR PHASE LOCK LOOP CHECK (GENERATOR BOARD)

SYNTHESIZER MODE OUTPUT BAD

SYNTHESIZER LOOP OK

FREQ OR PURITY ON ALL RANGES

BAD

FREQ OR < PURITY ATTPS ON SYNTH BO BA

?

NO

CHECK FREQUENCY

RANGING (SHEET4)

NO

CHECK COAX

SET MODE SWITCH 1-------------- TO SYNTH MODE


ISHEET21

COMPLETE STEPS 12- 14

OF CALIBRATION PROCEDURE

CHECK ICl. 9 CIRCUITS & SWl-D

ON GEN BO

NO

1-20 MHz PROPORTIONAL <io DIGITAL SW SETTIN ATPIN 11 IC14

........

·~ ?


{SHEET2l


YES

... CHECK

FN (SHEET 1)

v

FN GOOD

,, CHECK

COAX & MODE SELECTOR SW

(S1. FRONT PANELi

6-11

REFERENCE SELECTOR CHECK

SYNTH LOOP DOES NOT WORK WITH EXTERNAL REFERENCE

FREQUENCY SOURCE

YES

SELECTOR FUNCTIONAL

< BUT NO SIGNAL AT "REF OUT"

BNC

~

SYNTH LOOP DOES NOT WORK WITH INTERNAL REFERENCE

FREQUENCY SOURCE

X 100R < GREATER RANGE &

SYNTH MODE 7

ILLEGAL OPERATION

~ 1 MHz

EXT REF SIGNAL ;;;?; 1 VRMS SINE,

SQUARE OR TTL

7 NO

ILLEGAL OPERATION

PROBLEM IN IC1 OR, IF TTL BUFFER

'>------11.,. OPTION INSTALLED,

ICJJ

CHECK IC2

CHECK 08,9

CLOCK KILL CIRCUIT

CHECK 03,4

CIRCUIT


6-12

REF SELECTOR OK '>-~~--CHECKSYNTHLOOP

(SHEET2)

CHECK ICG-8

CIRCUIT

CHECK IC1 &01.2

CLOCK CIRCUIT

CHECK IC6-8

CIRCUIT

7.1 DRAWINGS

The following assembly drawings (with parts lists) and schematics are in the arrangement shown below.

7.2 ORDERING PARTS

When ordering spare parts, please specify part number, circuit reference, board, serial number of unit and, if applicable, the function performed.

CHASSIS

Assembly Drawing Schematic Parts List

MAIN BOARD


7 SECTION PARTS AND SCHEMATICS

7.3 ADDENDA

Under Wavetek's product improvement program, the latest electronic designs and circuits are incorporated into each Wavetek ·instrument as quickly as development and testing permit. Because of the time needed to compose and print instruction manuals, it is not always possible to include the most recent changes_. in the initial printing. Whenever this occurs, addendum pages are prepared to summarize the changes made and are inserted immediately inside the rear cover. If no such pages exist, the manual is correct as printed.

Page No.

7-2 7-3 7-4

7-6 7-7 7-8

SYNTHESIZER BOARD


7-10 7-11 7-12

7-1

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RES. HF, 1/BW. 1 X, 1. SK

..

91AR2K

RC20GF-221

RNSSO-IOOOF

RNS50-1001F

RN55D-1002F

RN550-lOROF

RN55D-1302F

RN550-I501F

RES. HF. 1/8W. 1%. IS. 2K RN550-1822F

RES. HF, I/SW, IX. 21\ RN55D-2001F

RES. l'IF, 1/BW, 1~. 20. SK RN55D-2052F

RES, 11f'. 1/BW. 1~. 2. 21K RNS50-2211F

RES. HF, I/SW. l:C:. 249 RN550-2490F

RES. 11f", I/SW. l;(, 2. 491\ RNS50-2491F

RES. HF. l/BW. 1%. 24. 9K RN55D-2492F

RES. MF, l/BW, IX. 301K RN550-3013F

4 I

WA\IETEK NO.

BECK 4600-02-0201

STKPL 4700-2$-2200

TRW 4701-03-1000

TRW 4701-03-1001

TRW

TRW

TRW

TRW

TRW

TRW

TRW

TRW

TRW

TRW

TRW

TRW

4701-03-1002

4701-03-1009

4701-03-1302

4701-oJ-1501

4701-03-1822

4701-03-2001

4701-03-2052

4701-03-2211

4701-03-2490

4701-03-2491

4701-03-2492

4701-03-3013

PCA. SYNTf-ESIZER ASSeMllL y NO. 1100-00-0225

TITLE

PACE: 3

PART DESCRIPTION OR IC-HFCR-PART-NO

RES. l'IF. 1/BW. l:C:. 4. 02K RN55D-4021F

RES. MF. !/BW. 17.. 47. SK RN550-4752F

RES. l'IF, l/8, J:t, 499 RN55D-4990F

RES. l'IF, l/BW. 17., 4. 99K RN550-4991F

RES. !'IF. ll'BW. !:C:. 56. 2 RN550-56R2F

RES. MF. 1/BW. JX, 61. 9 RN55D-61R9F

RES. MF. 1/8W. J;(, 8. :OSK RN5SD-8251F'

RES. MF. l/BW. IX. 909

RES, HF. 1/4W. 1'%. 121

RES.11F', ! 14W. I;(, 124

RES. MF. 1/444. IX. 49, 9

RES l'IODVLE

DIODE

DIODE

TRANS

TRANS

RN55D-9090F

RN600-1210F

RN600-1240F

RN600-49R9F

4310R-101-103

11V1404

2N3903

:!N3'105

tFGR WAllETEK NO.

TRW 4701-03-4021

TRW 4701-03-4752

TRW 4701-03-4990

TRW 4701-03-4991

TRW 4701-03-5629

TRW 4701-03-6199

TRW 4701-03-8251

TRW 4701-03-9090

TRW 4701-13-1210

TRW 4701-13-1240

TRW 4701-13-4999

BOURN 4770-00-oooe

MDT 4803-02-1404

FAIR 4807-02-6066

NSC 4901-03-9030

ITT 4901-03-9050

PCA. SYNTHESIZER ASSEMBLY NO. 1100-00-0225

PAGE: 4

5 t 4 I

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1

2

4

3

8

5

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11

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REFERENCE DESIQHATORS

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IC14 IC15 IC3 IC4 !CS

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WAVETEK FWTIS UST

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TRANS

SWITCH STOP

IQ)IFIED DETENT FROt'I: 5104-01-0010

IC

IC

IC

IC

IC

IC

IC

IC

VIX. TAGE REOULA TOR

IC

IC

IC

PCA, SYNTHES! ZER

TITLE

PART DESCRIPTION

IC

IC

IC

IC

IC

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PCA. SVNTIESI ZER

OR IG-HFCR-PART-NO

142-SWl-I

215-33-001-01-22

5104-99-00:26

U1 301AN

C04518BE

74LSOO

74LS02

7410

74LS10

74S74

74LS74

7805393

8601/9601

96L02

74151

I .. .. 1

WAVETEK NO.

MOT 4901-05-4850

WVTK 5104-02-0013

CTS 5104-07-0003

WVTK 5104-99-0026

NSC 7000-03-0100

RCA il000-45-1810

Tl B000-74-0010

TI 8000-74-0210

Tl 8000-74-1000

Tl 8000-74-1010

TI 8000-74-7401

Tl 8000-74-7410

FAIR 8000-78-0500

FAIR 8000-86-0100

FAIR 8000-96-0210

Tl 8007-41-!HOO


PAGE: 5

ORIG-tFGR-PART-NO MFGR WAVETEK NO.

74LS151 Tl 8007-41-51 !0

74LSl92 TI 8007-41-9210

74LS290 TI 8007-42-9010

74LS293 Tl 8007-42-9310

l'IC1648P l'IOT 8100-16-4810

l'IC4044P l'IOT 8 l 00-40-4400

ASSEMBLY NO. I 100-00-0225

PAGE 6

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