MAIN UBRARY

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THE E.S.O. PHOTOMETER

MAINTENANCE MANUAL

Waller Nees, Frank Middelburg,...

John Maton.

Europeon Southern Ob.ervatory

ESO •

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DOCUMENTATION OF THE E.S.O. PHOTOMETER

PHOTOMETER MANUAL

1. GENERAL INTRODUCTION

2. THE PHOTOMETER HEAD

3. THE CONTROL SYSTEM

4. CONTROL SYSTEM CIRCUITS

5. RIOS AND INTERFACE (IO) CIRCUITS

6. INTERC01TNECTION WIRING

Appendix - Manufacturer's data sheets

MAIN UßRARY

ELECTRICAL DRAWINGS - see DWGS XI in aseparate fo1der.

FURTHER DATA - refer to section 1.4

1. GENERAL INTRODUCTION

1.1 THE E.S.O. PHOTOMETER

1.2 CONTROL SYSTEM FEATURES

.. 1. 3 SOFTWARE CONTROL FEATURES

1.4 DRAWINGS AND DAT~ REFERENCES

1.1 THE E.S.O. PHOTOMETER

1.1.1 FORWARD

1.1.2 OPTICAL PRINCIPLE

1.1.3 PRE-SEPARATION BEAM PROCESSING

1.1.4 ELECTRIC SHUTTER PROTECTION

1.1.5 ALIGNMENT MICROSCOPE

1.2 CONTROL SYSTEM FEATURES

1. 2.1 GENERAL SYSTEM LAYOUT

1. 2.2 MANUAL CONTROL PANEL FUNCTIONS

1.2.3 THE INSTRUMENT COMPUTER SYSTEM

1. 2.4 REMOTE HANDSET CONTROL FUNCTIONS

1.3 SOFTWARE CONTROL FEATURES

1. 3.1

1.3.2

1.3.3

OPERATING CAPABILITIES

DATA ACQUISITION CYCLE

PROGRAMME OPERATING STATES

1.4 DRAWINGS AND DATA REFERENCES

1. 4.1

1. 4.2

1. 4.3

1.4.4

1.4.5

1.4.6

INTRODUCTION

RIOS/LOCAL STATION CIRCUITS

PHOTOMULTIPLIERS AND DISCRIMINATORS

THE CAMAC SYSTEM

COMPUTER INTERFACE

SERVO MOTORS AND ENCODERS

1.1 THE E.S.O. PHOTOMETER

1.1.1

1.1. 2

1.1. 3

1.1.4

1.1.5

FORWARD.

OPTICAL PRINCIPLE

PRE-SEPARATION BEAM PROCESSING

ELECTRIC SHUTTER PROTECTION

ALIGNMENT MICROSCOPE

List of Figures

1.1.3 PHOTOMETER CROSS SECTION

1.1.1 FORWARD

The European Southern Observatory (ESO) is a scienti­

fic collaboration between six European countries - Belgium,

Denmark, the Federal Republic of Germany, France, the

Netherlands and Sweden. Constituted by international agreement

in 1962, the aim of the organization is to further astronomical

research in the Southern Hemisphere.

Since 1965 a number of telescopes have been commissioned

at La Silla, Chile. At the present moment there are nine ESO

·astronomical instruments in operation on the observatory site.

The largest of these is the 3.6 metre telescope.

The E.S.O. 4 channel photometer was first suggested

by Professor Behr, working at ESO in 1972, for use in the

Cassegrain focus of the 3.6 metre telescope. Design and

development of the photometer system was carried out by the

telescope project division established on the premises of the

European Organization for Nuclear Research (CERN) in Geneva.

Installation and commissioning of the system at La Silla,

Chile took place in July, 1977.

1.1. 2 OPTICAL PRINCIPLE

The basic function of the photometer is to simulta­

neously measure the intensity of stellar radiation in either

three or four different selectable wavelength bands. Separa­

tion of the incoming light into these different bands is

accomplished using a set of dichroic mirrors, as illustrated

by the figure overleaf.

1.1. 2 (Continued)

Bond 4

incoming radiation

Wovelength Band Separation I

using Dichrote Mirrors.

Bond 3

Three of these mirrors are used, all inclined at an

angle of 45 0 with respect to the incoming radiation. Each

mirror acts as a short-wave reflector and long-wave transmitter

with an abrupt transmission between these two operating

characteristics. The transition wavelength is accurately

defined during manufacture. A separate photomultiplier tube

is used to measure the intensity of each wavelength band.

Using this method of detection all four bands are measured

simultaneously during the same integration period.

Although separation of the incoming radiation into

the required bands is performed by dichroic mirrors, the

exact bandwidth of each channel is defined by multilayer

interference filters. Both mirrors and filters are mounted

on an easily exchangeable mirror-filter assembly. This flexi­

bility allows different assemblies to be interchanged in

order to measure different wavelength bands.

1.1.2 (Continued)

Figure 1.1.2 shows the separation performance obtained

with a dichroic mirror assembly for u, v, b, y photometry.

The four bands indicated by short horizontal lines show the

appropriate bandwidths to be defined by interference filters.

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4 (6) CHANNEL PHOTOMETER

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1.1.3 PRE-SEPARATION BEAM PROCESSING

(Refer to Figure 1.1.3)

Before it passes through the mirror-filter assembly

the incoming starlight can be processed by various devices.

These include an adjustable-aperture diaphragm, a light­

chopper, a collimator, a rotating superachromatic half-wave

plate and a glan prism unit. Each of these devices is des­

cribed in detail in Section 2 of this manual.

A remotely controlled diaphragm wheel may be elec-

.trically rotated to select any one of ten circular· diaphragms

positioned around its periphery. These vary in aperture from

0.4 to 8.4 mm. Alternatively one pair of 4 twin diaphragms

may be selected. Each pair of holes is spaced 6.3 mm apart

and has aperture diameters varying from 0.7 to 2.1 mm. Twin

diaphragms are used in conjunction with the chopper wheel

to allow a faint star to be compared in magnitude with the

sky background:

The chopper wheel rotates at a speed of 50 Hz,

alternately switching between the two selected diaphragm

holes with a frequency of 100 Hz. The orientation, or rela­

tive position, of the twin diaphragm holes may be remotely

adjusted. This allows the two holes to be aligned so that

they correspohd exactly with the sky and background res­

pectively. For single diaphragm observations the chopper unit

is electrically retracted out of the beam path under remote

control.

A collimator lens is mounted directly behind the

diaphragm unit. This is used to provide a parallel light

beam to the dichroic mirrors.

A rotating superachromatic half wave plate depolarizes

the starlight before it passes through the dichroic mirrors.

This prevents interference effects from being generated due

1.1.3 (Continued)

to the polarizing properties of the mirrors. The plate

rotates with a speed of 12.5 Hz which is synchronized to the

chopper wheel speed of 50 Hz via a 1:4 electronic reduction

ratio in the speed control servos. Phase angle discrimination

is used in the control circuits to ensure perfect synchro­

nization and thereby preventing interference effects deve­

lopping between the chopper and plate.

A Glan prism can be manually inserted to modulate

·the starlight intensity if polarization is present. The

extraordinary beam passes through the prism while the or­

dinary beam is diverted through an angle of 90 0 into a light­

trap.

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1.1.4 ELECTRIC SHUTTER PROTECTION

An electrically-operated shutter is incorporated

within the collimator lens assembly. Closing the shutter cuts

off the incoming light beam to all of the photomultiplier

cells, thereby providing complete protection from damage.

Interlocks are included in the operating programme to prevent

the shutter from being opened during the setting-up proce­

dures.

1.1.5 ALIGNMENT MICROSCOPE

(Refer to Fig. 1.1.3)

A retractable microscope is incorporated in the

photometer to allow the star position to be exactly positioned

in the centre of the diaphragm. During twin diaphragm obser­

vations the microscope is used to align sky and background

positions respectively in the two diaphragm holes. Ad~ustment

is made using x-y :vernier controls and an illuminated cross­

hair plate in the eye-piece.

When not in use the microscope is displaced laterally

38 mm. from the optical centre, clearing the light-path to

the collimator lens and shutter assembly.

1.2 CONTROL SYSTEM FEATURES

1. 2.1 GENERAL SYSTEM LAYOUT

1. 2.2 MANUAL CONTROL PANEL FUNCTIONS

1. 2.3 THE INSTRUMENT COMPUTER SYSTEM

1. 2.4 REMOTE HANDSET CONTROL FUNCTIONS

List cf Figures

1.2.1 PHOTOMETER SYSTEM CONFIGURATION

1.2.2 MANUAL CONTROL' PANEL LAYOUT

1.2.4 HANDSET PANEL LAYOUT

1.2.1 GENERAL SYSTEM LAYOUT

(Refer to Figure 1.2.1)

The Photometer system consists physically of the

photometer itself, the hardware control rack and remote

control handset which are all located in the cassegrain

cage, the instrument computer system and a CRT terminal which

are located in the control room.

Refer to Figure 1.2.1 which is a block diagram of

the complete photometer system. Division of equipment between

the cassegrain cage and the control room is shown by dotted

lines. Parallel communications lines are uscd betv7een the

contral room and the cassegrain cage, both for the CAMAC

crate and the RIaS to local station link. The cassegrain

CAMAC crate is contrdled by an HP-single crate controller

Long distance communications between this crate and the

instrument computer are realized by a set of parallel line~

drivers/receivers as shown.

An operator contras the photometer system using

either the HP-2640 CRT terminal, located at the instrument

computer control cabin, or either the remote control hand­

set or manual control panel which are used in the cassegrain

cage. The manual control panel is mounted in the instrument

rack and is only used for testing purposes. Both the remote

control handset and the HP-2640 CRT terminal generate command

signals to the computer. They control the photometer via the

software operating system, or control programme. The manual

control panel provides direct operator access to the hard­

ware control rack and is independant of the computer.

The instrumentation rack contains the manual control

panel, two control chassis', the power amplifier chassis, a

remote input/output station (RIaS) and a CAMAC crate. The

two control chassis'house the speed control circuits, chopper

1.2.1 (Continued)

assembly and head assembly position control circuits and the

shutter control circuits. The head assembly refers to the

base plate supporting the diaphragm and chopper wheel units.

This assembly can be rotated to position the twin diaphragm

holes in the optimum position with respect to the observed

star and background fields.

Computer control and monitoring of the different

photometer functions takes place via a data transmission

. system which uses a standard parallel RIOS and LOCAL STATION.

These units are identical with the standard units used on the

3.6 metre telescope. Commands from the remote handset to

the computer are also transmitted via the RIOS. Data output

from the four photomultiplier tubes is processed and trans­

mitted serially to the computer by a standard CAMAC crate.

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TELESCOPE PROJECT DIVISION

1.2.2 MANUAL CONTROL PANEL FUNCTIONS

(Refer to Figure 1.2.2)

The photometer is normally controlled by the computer

via the HP-2640 CRT terminal or the remote control handset.

The manual control panel is provided to allow direct control

over the hardware systems for testing and maintenance pur­

poses.

Refer to Figure 1.2.2 which shows the front panel

layout of the manual control panel. Each control function is

.governed by a 'MAN/RIOS' toggle switch located in a line

along the bottom of the control panel. These switches must

normally be left in the 'RIOS' position to allow the computer

to control the photometer. Switchihg any of the 'MAN/RIOS'

switches to 'MAN' causes the corresponding indicator to be

illuminated and transfers control of the appropriate function

to the control panel switches. The computer may, however,

still monitor the status of each photometer function.~

.DIAPHRAGM ·CONTROL - the diaphragm is step-adjustable

through 15 different positions. Each position is identified

by a diaphragm code number varying from 0 to 14. See section

2.2 for a list of diaphragm sizes and types for each code

number. The position of the diaphragm is determined using a

digital encoder and the appropriate code number is displayed

on both the handset and the CRT terminal. As the encoder is

an incremental type the position counting system must be

initialized when the power is first switched on or if the

diaphragm code is suspect. This initializing procedure is

carried out automatically during computer control.

In order to control the diaphragm manually switch the

'MAN/RIOS' switch to 'MAN'. Set the 'INIT' toggle switch and

push the 'CLOCK' button. This initializes the position

counting system and sets the diaphragm code to O. Cancel the

1.2.2 (Continued)

'INIT' toggle switch and set either the (+) or (-) toggle

switch. Pushing the 'CLOCK' button will now cause the dia­

phragm wheel to be incremented, one step for each push on

the button, in the direction selected. Continue depressing

the 'CLOCK' button until the required diaphragm size and

type has been selected.

1/2 LAMBDA AND CHOPPER MOTOR SPEED CONTROL - the

1/2 lambda plate and chopper wheel motors are driven by an

·electronic speed control system. To switch either of these

motors on manually set the appropriate 'MAN/RIOS' switch to

'MAN' and set the motor switch to 'ON'.

During the time required by the motor to accelerate

up to speed an error will be sensed by the drive circuits.

This will turn on the 'LEAD/LAG~ and 'ERROR' indicators.

After the motor has reached its correct speed the control

loop will lock and thereafter accurately regulate the motor

speed. The 'ERROR' indicator will remain illuminated as it

is driven by a latching circuit. Press the clear button to

cancel this indicator. During normal system operation (ob­

servation) both motors and indicators are controlled auto­

matically by the computer. The 'ERROR' indicator will be

automatically cleared by the computer and no manual inter­

vention is necessary.

If at any time during a measurement the motor speed

varies outside the permitted tolerance the 'ERROR' indicator

will again latch-on. This indicates that data measured

during this time should be regarded as suspect. If frequent

errors are found in the speed control system refer to the de-,

tailed circuit descriptions in section 4 of this manual.

1.2.2 (Continued)

CHOPPER/HEAD ASSEMBLY POSITION CONTROL - after

selecting manual operation the chopper assembly may be moved

into or out of the light path using the appropriate toggle

switch. The two indicator lamps signal when the chopper is

at either limit ; fully retracted or fully inserted in the

light path.

The 'HEAD' assembly refers to the base plate suppor­

ting the diaphragm and chopper units. This assembly can be

rotated in either the CW (clockwise) or CCW (counter­

clockwise) direction using the three position toggle-switch

provided. The assembly normally rotates at slow speed to

allow precise adjustment. Pushing the FAST/SLOW button

simultaneously with the CW/CCW switch causes the Head

assembly to move at fast speed for rapid positioning.

The Head assembly may be rotated through l80~ of

freedom to positi~n the twin diaphragm holes in the optimum

position with respect to the observed star and background,

fields. An angular readout of the position is displayed on

both the handset and the CRT terminal. Limit stops are

incorporated at each extreme of travel and CW/CCW indicators

on the control panel signal when one of these extremes has

been reached.

SHUTTER CONTROL - to operate the shutter manually set

the 'MAN/RIOS' switch to 'MAN' and select either 'OPEN' or

'CLOSED' with the appropriate toggle switch. The 'CLOCK'

button must then be momentarily depressed to register (or

clock) the command into the control circuits. The two indi­

cator lamps signal when the shutter is fully engaged in either

the open or closed position.

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FIG.1.2.2 MANUAL CONTROL PANEL LAYOUT

1.2.3 THE INSTRUMENT COMPUTER SYSTEM

(Refer to Figure 1.2.1)

Refer to Figure 1.2.1 of the previous section which

shows a block diagram of the complete photometer system,

including those parts of the instrument computer system

which are relevant to the photometer. A Hewlett Packard

2100 computer located in the instrument control room is pro­

vided for the eventual control and monitoring of various

instruments used on the 3.6 metre telescope. Figure 1.2.1

-shows only those elements wmch are directly concerned with,

or used by, the photometer system.

Output data from the four photomultiplier tubes is

processed by various instrumentation modules housed in a

standard CAMAC crate. This is located nearby in the casse­

grain cage. Data is transferred in parallel via line drivers/

receivers to the instrument computer on IO channels 22 and

23.:

Control and status information is transmitted bi­

directionally between the computer and the hardware controls

via a standard parallel RIOS and LOCAL STATION. Figure 1.2.1

shows only those elements of this system applicable to the

photometer. Both the RIOS and LOCAL STATION may be expanded

using additional plug-in IO cards in order to control or

monitor other systems and instruments •. In the same way addi­

tional instrumentation modules may be added to the CAMAC

crates in order to expand their functions.

Aserial link to the instrument computer, IO channel

21, is provided in order to communicate with either the

System II computer or a tape reader. This link is mainly

intended for initial loading of the instrument computer

programmes.

1.2.3 (Continued)

Measured data output is stored on a Hewlett Packard

7970 B, 25 ips magnetic tape unit, IO channels 10 and 11.

Direct memory access is used on these channels in order to

utilize the high data transfer rate of the tape unit. A

listing of sample data may be obtained simultaneously on a

printer. Data format, headings and the volume of data re­

corded orprinted may be independantly controlled by an

operator through the HP,2640 CRT terminal. This terminal pro-

·vides overall control and monitoring of all aspects of the

photometer system.

1.2.4 REMOTE HANDSET CONTROL FUNCTIONS

(Refer to Figure 1.2.4)

Although an operator normal1y contro1s the photo­

meter through the HP-2640 CRT terminal, a remote control

handset is also provided. This portable handset is easily

manoevrab1e and is equipped with a reduced set of the most­

common1y required software command functions. During operation

of the photometer the initialization procedure, se1ection of

measuring mode and various input parameters are specified

through the CRT terminal. Adjustment refinements and control

of the measurements during observation may be carried out via

the remote contro1 handset if required. The fu11 set of soft­

ware commands and faci1ities are described briefly in the_

fo11owing section.

Refer to Figure 1.2.4 which shows the front panel

layout of the handset. Four pushbuttons and a four digit LED

display at the bottom of the handset are concerned with

contro1 of the head rotation (baseplate assemb1y). Fast speed

1.2.4 (Continued)

rotation is provided for rapid positioning while the slow

speed allows accurate final adjustment. The digital indicator

reads the angular position of the head (in degrees) within a

total range of 0 - 1800 • CW or CCW travel-direction is

signalIed by an indicator lamp above the appropriate button.

Control of the chopper assembly and shutter is straight­

forward. The appropriate indicator lamps signal when these

mechanisms are either fully retracted (out) or fully inserted

in the light beam path.

The diaphragm wheel may be step-adjusted through 15

different positions using the increment (+) or decrement (-)

buttons. Each position is identified numerically by the dia­

phragm code number (0-14), which is displayed on a two digit

LED indicator. Code number 0 corresponds to the largest

single hole diaphragm position. See Section 2.2 for ~ list

of the various di~phragm sizes and types together with their

corresponding code numbers.

The two top central buttons labelIed as 'SKY' and

'STAR' are used to identify the observed field. Por normal

photometry a single diaphragm hole is used to observe either

the star or its sky background and the appropriate identifying

button is pushed. In the chopper mode of observation twin

diaphragms are used, one of which is marked 'A' on the

diaphragm wheel. The chopper wheel is used in this mode to

switch between sky and star radiation. at high speed, allowing

comparative measurements to be made. Due to manufacturing

tolerances in the chopper wheel and switching circuit delays

some inequality may exist in the integrated time period for

which each channel is sampled. To allow a correction to be

made for this effect the sky and star diaphragms may be re­

versed during a second measurement run. The 'SKY' button

1.2.4 (Continued)

selects the sky as field in diaphragm A with the star in

diaphragm B. The 'STAR' button reverses these functions. The

appropriate two indicator lights signal which configuration

has been selected.

The remaining three buttons 'START', 'STOP' and

'END', together with their appropriate indicator lamps, are

concerned with controlling and signalling the current state

'of the control programme.

Pushing the 'END' button causes all measurements for

a particular star to be terminated! including storage of all

pending measurement data. The corresponding indicator light

signals that the measurement has been terminated and that the

programme is waiting for the telescope to be moved to the

next object. The indicator above the 'START' button signals~

that integration measurement is in progress. Pushing the

'STOP' button causes integration to be suspended and the

appropriate indicator lamp is illuminated. This would be used

during twin diaphragm observations when the diaphragm functions

were reversed. It would also be used, for example, during

single diaphragm observations when the telescope was being

moved from star to sky field (or vice versa) •

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Object: PHOTOMETER

HANDSET PHYSICAL LAYOUT

ESOEUROPEAN SOUTHERN OBSERVATORY, 1211 GENEVA 23

TELESCOPE PROJECT DIVISION

1. 3 . SOFTWARE CONTROL FEATURES

1. 3.1

1. 3.2

1.3.3

OPERATING CAPABILITIES

DATA ACQUISITION CYCLE

PROGRAMME OPERATING STATES

1.3.1 OPERATING CAPABILITIES

This section briefly describes the control programme

software for the photometer system.

!Communi­

cations between an operator and the control programme is

normally via a CRT-terminal. The screen of this terminal is

used to display the current operating status of both the

programme and the photometer, as weIl as displaying the

measured data. Output data can be stored on magnettc tape

and/or listed on a printer. Data format, headings and the

volume of data recorded or printed is programme controlled

and may be specified through the t~rminal. Recorded data is

coded in standard ASCII.

The programme is designed to operate in one of three

measuring modes : normal photometry, chopper photometry and

polarimetry. Capabilities for high speed photometry are not

provided at the p~esent moment. As far as the hardware is

concerned there is no difference between,normal photometry

and polarimetry. However, in the polarimetry mode the software

programme measures each of the 64 half-lambda positions se­

parately. In order to display output data on the terminal

screen a mean is taken and output is displayed as in normal

photometry.

The programme will operate with three different

observing systems : broadband UBV, narrow band UVBY and

hydrogen lines. The programme automatically selects the correct

output doding and screen formatting for each system.

1.3.2 DATA ACQUISITION CYCLE

The data acquisition cycle is an internal unit of time

which is fundamental to the control software timing. It is

defined as the periodic unit of time during which data is

integrated, before being sampled and converted to a useable

value within the software programme. The length of this cycle

is user-defined. If unspecified it will default to 5 seconds.

It is advantageous to use the shortest possible

acquisition time so that measured data is weIl monitored .

. However, the programme requires sufficient time within each

cycle to process the sampled data.

The optimum cycle time_depends on the measuring mode,

data destination(s) and data output rate(s). With this in

mind it should be pointed out that data display, storage and

listing rates are all dependant on the cycle time. The CRT­

terminal display is updated once per cycle while data storage.. ~

and listing rates are user-defined as integer multiples of

the cycle time. For example specifying a listing rate of

n = 3 would cause measured data to be printed once every three

cycles.

After specifying these variables a user should ex­

periment to find the shortest convenient cycle length. The

programme will stop integrating and communicate an error

message if the cycle time is found to be too short.

1.3.3 PROGRAMME OPERATING STATES

(Refer to Figure 1.3.3)

The control programme will always be in one of four

possible operating states : IDLE, STANDBY, SUSPENDED or

INTEGRATING. Refer to Figure 1.3.3 which shows the inter­

relationships between each of these states and lists the

1.3.3 (Continued)

principle cornmands executable in each state. The 'END',

'START' and 'STOPf cornmands, shown in small rectangles, are

used by an operator to cause transition of the programme from

one state to another. The control programme may also change

state automatically in the event of, for example, an error

condition.

The IDLE state is not normally used except during

tests or when the motors are to be switched off fo~ long periods.

'When the system power is first switched on the programme

automatically enters the STANDBY state.

In the STANDBY state the system is initialized prior

to taking measurements. Principle commands, which are only

executable in this state can be used to :

specify the operating mod~,

define "the data acquisition cycle length,

and to ter-minate observing after all measurements

for the night have been completed. Giving the START

command would cause the programme to begin integration,

however, as the system has just been switched on it would

probably be necessary to specify further variables prior to

taking measurements. If this was not done default values

would be assumed.

Additional principle commands are listed on Fig.

1.3.3 under 'RUNNING COMMANDS' and are executable in either

the STANDBY or SUSPENDED states. They allow the following

functions to be controlled :

to position the chopper assembly,

to select the required diaphragm,

to specify the field (SKY or STAR),

to position the head assy. for twin diaphragm

1.3.3 (Continued)

measurements,

to specify the total integration time as an integer

multiple of the cycle time.

In the INTEGRATE state the programme begins taking

measurements according to the foregoing command specifications.

During the measurement none of the previously-described

commands can be used as they would corrupt the measurement

data. If required the SHUTTER and DATA OUTPUT control com-

rmands could be used during integration, however these commands

can be similarly specified in state 1 (STANDBY) or state 2

(SUSPENDED) before measurement commences.

Giving the 'STOP' command causes integration to be

suspended, available data is output and the programme enters

state 2 (suspended). Alternatively giving the 'END' command

causes an obje~~ measurement to be completed and the programme

returns to the STANDBY state.

In the SUSPENDED state the measurement conditions

may be altered prior to resuming integration using the

running commands. This state would be used during twin dia­

phragm observations when the diaphragm functions were

reversed. It would also be used, for example, during single

diaphragm observations when the telescope was being moved

from star to sky field (or vice versa).

FIG. 1. 3. 3

PROGRAMME STATE DIAGRAM

INiTlALIZATIONCOMMANDS

SPECIFY MODE

DEFINE CYCLE LENGTH

SPECIFY SITE LATITUDE

TERMINATE OBSERVING

.------ -------\\\

\\\

\\---­/

//

//

//__J

RUNNINGCOMMANDS

POSITION CHOPPER ASSYPOSITION DIAPHRAGM

SPECIFY FIELD

POSITION HEAD ASSYSPEClFY INTG LENGTH

NOTE:

SHUTTER MAY BE OPERATED IN ANY STATE

DATA OUTPUT CONTROL COMMANDS EXECUTE

IN ANY STATE

1.4 DRAWINGS AND DATA REFERENCES

1. 4.1

1.4.2

1. 4.3

1. 4.4

1. 4.5

INTRODUCTION

RIOS/LOCAL STATION CIRCUITS

PHOTOMULTIPLIERS AND DISCRIMINATORS

THE CAMAC SYSTEM

COMPUTER INTERFACE

1.4.1 INTRODUCTION

The remainder of this manual provides detailed

information on the construction and wiring of the photometer,

and on the control system circuitry and interconnection wiring.

Section 2 describes the mechanical construction and internal

wiring of the photometer head. Appropriate drawings of the

various sub-assernblies are included.

The control system circuitry and interconnection

wiring are described in sections 3, 4 and 5. A complete set

of drawings for the control system is available in aseparate

folder, titled DWGS. XI. Many of the drawings are also inclu­

ded in this manual together with a full description of their

operation.

The Camac system and various other parts not manufac­

tured by ESO, such as photomultiplier tubes, discriminators

and encoders, are not described in detail in this manual.

Detailed manufacturer's information is reffered to in the

following reference sections (1.4.2 - 1.4.6). Refer also to

the end of this manual where an appendix of useful manu­

facturer's data is included.

1.4.2 RIOS!LOCAL STATION CIRCUITS

The basic RIOS and LOCAL STATION circuits used for

bi-directional transmission of control and status signals are

fully described in the control manual of the 3.6 metre

telescope, issued in May 1977. Refer to '3.6 m. CONTROL

MANUAL', PART 1, Section 6 and PART 2, Section 6a.

Some of the 10 cards used in the photometer RIOS are

either slightly modified types or special card designs.

1.4.2 (Continued)

Refer to section 6 of this manual for details of these modi­

fications. Information is also included in that section on

the control word formats, IO addresses and bit assignments.

Refer to the 3.6 m Control Manual for descriptions of all

basic RIOS circuits including : parallel driver and receiver

cards, control card and echo card.

1.4.3 PHOTOMULTIPLIERS AND DISCRIMINATORS

Four RCA 8575 12 stage photomultipliers are used in

the photometer unit. Each photomultiplier is supplied with a

1,450 volt high tension supply via. a plug and socket connec­

tion in the photometer housing. A chain of divider resistors

is wired on each photomultiplier socket to provide the

various voltages to each electrode. Base pin connections and

divider wiring.are shown in the data sheet at the en~of this

manual.

The RCA 8575 photomultiplier tube has a very low

dark level current (approx. 30 counts/sec.). Because of this

the base of the tube and its socket should never be allowed

to become contaminated by handling. Such contamination pro­

duces leakage and dark current. If the tube base or socket

is handled it should be washed with a solution of alkaline

soap cleaner (Alconox or equivalent) in de-ionized or dis­

tilled water having a temperature of less than 60 oC. Careful

scrubbing between pins and socket contacts is useful. The

base of the socket should then be rinsed in de-ionized or

distilled water (60 oC.) for several minutes and then air­

blown dry.

A temporary increase in anode dark current by as

much as 3 orders of magnitude may occur if the tube is.exposed

momentarily to high-intensity ultraviolet radiation from sources

1.4.3 (Continued)

such as fluorescent room lighting even though the high voltage

supply is disconnected. The increase in dark current may

persist for aperiod of up to 48 hours following such

irradiation.

An AD-104 pulse-amplifier-discriminator is used to

interface each photomultiplier with the CAMAC crate. These

modules are mounted directly on the photometer behind each

photomultiplier. A data sheet and circuit diagrarn will be

'found in the appendix at the end of this manual.

1.4.4 THE CAMAC SYSTEM

Refer back to Figure 1.2.1 which is a complete block

diagram of the photometer system and shows the different

CAMAC modules which are presently used for processing the

photometer output data.

CAMAC CRATE AND CONTROLLER : the CAMAC crate in

the Cassegrain cage contains an HP-CAMAC dedicated crate

controller interface, HP-CC type 172. This module is inter­

faced via parallel line drivers/receivers with two IO cards

in the HP2l00 computer at select code positions 22 and 23.

Refer to CERN CAMAC note 27-02, issued in July 1975,

for details on the HP-CC type 172 crate controller. Refer also

to the appendix at the end of this manual for details of the

input/output connections to the HP-CC controller.

CASSEGRAIN CAGE CAMAC MODULES

DIFFERENTIAL LINE RECEIVER : this special module

interfaces with the photomultiplier discriminators and is

illustrated in Figure 1.4.4.

1.4.4 (Continued)

FAN-IN/FAN-OUT MODULE LRS model 429 CAMAC module.

MICROSCALER : BORER model 1004A quad scaler, refer

to appendix for specifications and functions.

1.4.5

TTL/NIM LEVEL ADAPTER

COMPUTER INTERFACE

LRS model 688AL CAMAC module.

Refer back to Figure 1.2.1 which shows the complete

photometer system and the functkn of the different computer

10 channels. The list below gives ·the type number of each

computer 10 card. Refer to the appropriate HP instruction

manual for further details.

READER·OR SERIAL LINK (10 POSITION 21) : An HP

12665 Serial Inte~face may be used to link the instrument com­

puter with the system 11 computer. Alternatively an HP 12597

8 bit Duplex Register Interface may be used for direct

programme loading from an HP 2748B Tape Reader.

LOCAL STATION INTERFACE (10 POSITIONS, 12, 14, 16,

20, 24, 25) : a modified HP micro-circuit interface kit,

card type 12566, is used in these positions. For details of

the modifications and input/output wiring refer to the

'3.6 m. CONTROL MANUAL', PART 1, Section 6.2 and PART 2,

Section 6a.2.5.

CAMAC INTERFACE (10 POSITIONS 22, 23) : a standard

HP micro-circuit in~face kit, card type 12566, is used in

these positions. Refer to CERN CAMAC note 27-02, issued in

July 1975, for link details. Refer to the appendix at the

end of this manual for details of the input/output connections

used.

1.4.5 (Continued)

MAGNETIC TAPE INTERFACE (10 POSITIONS 10,11) HP

1318 A Interface Kit.

SERIAL TTY/CRT INTERFACE (10 POSITIONS 15, 13) : ­

These positions use either an HP 12880A or HP 12531C Seria1

Interface.

2. TEE PHOTOMETER EEAD

2.1 INTRODUCTION

2.2 DIAPHRAGM UNIT

2.3 HALF WAVE PLATE UNIT

2.4 MIRROR/FILTER ASSEMBLY

2.5 MICROSCOPE

2.6 PHOTOMULTIPLIER UNIT

2.1 INTRODUCTION

The photometer head contains all of the optical elements and

the photomultiplier tubes to process the incoming Iight and generate

four electrical outputs proportiona] to the radiation intensity in

each wavelength band. Each intensity output signal is a pulsed type

with pulse output rate proportional to the radiation intensfty'in

that band.

All control signal inputs are electrical and are carried to

the photometer head on plug and socket connections. This allows the

photometer to be easily removed from its operating position in the

cassegrain top unit. The internal wiring of the head is shown in

Fig. 2.1. For details of the interconnection pin numbers used in

each connector refer to Section 6.

The various mechanical assemblies are described separately

in Sections 2.2 to 2.6. A cross-sectionaI view of the photometer

in Fig. 1.1.3 shows the basic mechanical layout.

2.2 DIAPHRAGM UNIT

The diaphragm whee1 is driven by an Inland DC torque motor

which may be driven in either direction of trave1 to select the

required diaphragm aperture(s). An optical slot encoder is used to

sense the exact position of each of the apertures which are spaced

at 24 degree interva1s. The table be10w shows the code number used

to identify the different sizes ahd types :-

POSITION CODE

o1

2

3

4

56

78

910

11

12

13

14

APERTURE DIA. - mm

8.40

6.30

4.20

2.80

2.10

1.75

1.40

1.05

0.70

0.40

0.70/0.70

1.00/1.00

1.40/1.40

1.90/1.90

o

Using the pulse output rate of the rotary optica1 encoder

as a measure of velocity, the speed of the diaphragm whee1 is

1imited to 0.2 RPM. At each aperture position a spring-loaded detent

pin engages to assure a reproducubi]ity for each position within

0.03 mm from the theoretica1 optica1 centre. This includes the p1ay

in the bearings and pin guiding.

2.3 HALF-WAVE PLATE DRIVE UNIT

The rotating ha1f-wave p1ate is driven by an Inland DC motor.

An incrementa1 optica1 encoder is used to generate velocity and phase

feedback signals for the contro1 system. Both the shutter and a

condenser 1ens are a'l'so mounted on the aame base p1ate. The eondense r

1ens is integrated into the shutter and can be adjusted through a

total trave1 of 3 mm. The base p1ate is fixed to the cy1indrica1

structur carrying the diaphragm unit and the comp1ete assemb1y is

retained with three 10ng screws.

2.4 . MTILqOR!FILTER ASSEMBLY

The mirror/fi1ter assembly contains the three dichroic

mirrors and four interference filters which split incoming light

into four different wavelenght bands. Four such inter-changeab1e

assemblies are used for different appl'ications. Each assembly is

equipped with a different set of filters an~ mirrmrs to suit the

appropriate wavelengths being investigated.

The supporting structure is composed,of three blocks which

are screwed together with four counter-bored socket head screws.

Each mirror3filter combination "is held in spring-loaded aluminium

mounting frames. These frames can be vertically adjusted through a

total travel of 3 mm'using three adjusting screws.

The complete assembly is held in position against the lower

end flange by four screws to allow easy exchange of mirrQ~/fi1ter

units.

2.5 MICROSCOPE

The microscope is used to control and adjust the position

of the star in the diaphragm. When not being used the microscope is

displaced laterally, 38 mm from the optica1 centre, to free the

aperture from the diaphragm.

The microscope consists of a prism, two simple condenser

lens, an x-y displacement table, an eye-piece and an illuminated

cross-hair to allow exact centering of the star. The x-y displacement

table has an adjustment range of 24 mm. It is controlled manua1ly

via a rack and pinion drive and is equipped with a clamp, acting on

the gear, to lock the microscope at the observing position. Two

mechanical stops are incorporated to limit the extremes of travel

( observing position and fully withdrawn position stops ).

2.6 PHOTor~LTIPLIERUNIT

The complete photomultiplier unit consists of the detecting

photomultiplier tube, the voltage dividers, pulse pre-amplifiers and

a Fabry-Perrot lens. The photomultiplier tube-is surrounded by a

dry-ice cold box and may be coo1ed if necess~J to a temperature of

-78 degrees centigrade.

Incoming light enters the photomultiplier tube via two glass

windows separated by a thin tube. The space between these two windows

is evacuated to 10-5 Torr to prevent icing and minimize heat transfer.

The photomultiplier tube is enclosed by a magnetic shield

which is connected to the cathode at a potential of up to 2000 volts.

The shield i8 isolated using teflon spacers. in the corners and a

teflon sleeve on the socket side. The teflon sleeve is lined with a

thin copper tube which is used to connect the shield to the photo­

multiplier cathode. Spring mounting is used to assure precise

positioning and prevent damage to the tube or supporting structure

due to differential thermal expansion.

3. THE CONTROL SYSTEM

3.1 CONTROL SYSTEM LAYOUT

3.2 1/2 WAVE PLATE AND CHOPPER SPEED CONTROL

3.3 DIAPHRAGM CONTROL

3.4 CHOPPER ASSEMBLY AND HEAD POSITION CONTROL

3.5 SHUTTER CONTROL

3.1 CONTROL SYSTEM LAYOUT

3.1.1

3.1. 2

3.1. 3

THE CONTROL RACK

CONTROL SIGNAL MULTIPLEXING

CABLE INTERCONNECTIONS

3.2 1/2 LAMBDA PLATE AND CHOPPER SPEED CONTROL

3.2.1

3.2.2

3.2.3

3.2.4

SPEED CONTROL AND SYNCHRONIZATION

VELOCITY FEEDBACK

PID AND POWER AMPLIFIER UNITS

DATA CONTROL AND INTERRUPTS

3.3 DIAPHRAGM CONTROL

3.3.1

3.3.2

3.3.3

COMMAND FUNCTIONS

CONTROL LOGIC

VELOCITY FEEDBACK

3.4 CHOPPER ASSEMBLY AND HEAD POSITION CONTROL

3.4.1

3.4.2

3.4.3

COMMAND FUNCTIONS

HEAD POSITION CONTROL

CHOPPER ASSEMBLY CONTROL

3.5 SHUTTER CONTROL

3.1 CONTROL SYSTEM LAYOUT

3.1.1

3.1. 2

3.1. 3

3.1.1

3.1. 3

THE CONTROL RACK

CONTROL SIGNAL MULTIPLEXING

CABLE INTERCONNECTIONS

List of Figures

PHOTOMETER CONTROL DIAGRAM

CABLE INTERCONNECTION DIAGRAM

3.1.1 THE CONTROL RACK

(Refer to Figure 3.1.1)

Figure 3.1.1 shows the circuitry of the hardware

control system which is housed in a rack in the cassegrain

cage. Refer also to Figure 1.2.1 as required which is a block

diagram showing all the major elements of the photometer

system. The hardware control rack contains six major chassis

units as listed below :-

(i) - the top rack position houses the RIOS for

interfacing the hardware control system with

the computer.

(ii) - the next rack position houses the manual control

panel (described functionally in section 1.2.2).

(iii), (iv), (v) - control chassis' 1, 2 and the power

amplifier chassis are housed in the following

three positions. These three units form the

basic hardware control system as shown schema­

tically in Figure 3.1.1.

(vi) - the bottom rack position contains the high

voltage power supply for the photomultipliers.

Control chassis number 1 contains the synchronized

speed control system for the 1/2 wave plate and chopper motor,

and the control logic for diaphragm positioning. Output

signals from these systems drive the appropriate D.C. servo

motors via integrated power amplifiers in the power amplifier

chassis.

Control chassis number 2 contains the control circuits

for positioning the chopper assembly and the head, for control

of the shutter and all interfacing circuits required for hand­

set control. Both the chopper assembly and the rotary head

are driven by D.C. servo motors while the shutter is controlled

by a solenoid.

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3.1.2 CONTROL SIGNAL MULTIPLEXING

(Refer to Figure 3.1.1)

The left hand side of Figure 3.1.1 shows 5 multiplex

selectors ; chassis 1, cards 3, 4, 5 and chassis 2, cards

7, 8. Each multiplexer is independantly switched to select

one of two different command signal sources. These command

signals are generated by either the RIOS or the manual control

panel (commands and information from the handset only acts

via the control programme software).

For each control function (for example diaphragm

control) two sets of command lines are wired to the appropriate

multiplexer (chassis 1, card 5 for the diaphragm), one set

from the manual control panel, the other from the appropriate

RIOS IO card. Selection of either manual or RIOS control is

made by independant toggle switches on the manual control

panel (refer to section 1.2.2).

If the individual command line cable connection

between the manual control panel and control chassis is not

connected, the corresponding multiplexer is automatically

set for RIOS control.

3.1.3 CABLE INTERCONNECTIONS

(Refer to Figure 3.1.3)

Figure 3.1.3 shows the cable interconnections between

all parts of the photometer system which are located in the

cassegrain cage. If the print size is too small to be read

conveniently refer to the full size drawing, DWG. XI. la

(available in aseparate folder).

Each connection to the control rack is labelIed

with an identifying number preceded by the letter J. These

identifying codes are marked on both the cable and the rear

3.1. 3 (Continued)

of each chassis unit. The photometer head itself, the photo­

meter junction box and the remote-control handset are shown

at the top of the drawing. Command signals from the handset

are wired via control chassis 2 to an input register in the

RIOS (J42, 41). Cable J42 also carries output signals from

the computer to the digital displays and indicator lamps in

the handset.

All main connections between the control rack and the

"photometer itself are carried via connector J8/J54 (shutter

control), J9/J53 (motor control and limit switches), J10/J52,

J56 (encoder signals and limit switches). Cable J34 provides

the supply voltages for the pulse discriminator-amplifiers

which are mounted on the photometer cold boxes. Output pulses

from these units are wired directly to the CAMAC crate. This

is housed in aseparate rack in the cassegrain cage. Data

control signals from the control rack to the CAMAC crate are

carried on connectors J24, J25.

Detailed drawings of the interconnection wiring

and pin connections will be found in Section 6 of ~his manual.

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3.2 1/2 LAMBDA PLATE AND CHOPPER SPEED CONTROL

3.2.1

3.2.2

3.2.3

3.2.4

SPEED CONTROL AND SYNCHRONIZATION

VELOCITY FEEDBACK

PID AND POWER AMPLIFIER UNITS

DATA CONTROL AND INTERRUPTS

List cf Figures

3.2.4 DATA CONTROL TIMING SIGNALS

3.2.1 SPEED CONTROL AND SYNCHRONIZATION

(Refer to Figure 3.1.1)

The 172 lambda plate and chopper wheel drive motors

are speed-controlled by two identical servo control systems.

These two systems are frequency synchronized to prevent inter­

ference effects from occurring in the measured data. Incre­

mental encoders are driven directly by the D.C. servo drive

motors. Output pulses from these encoders are compared in

frequency and phase with standard reference frequencies in order

·-to correct any error in the motor speed.

Refer to Fig. 3.1.1 Card CH1-l (control chassis 1,

card 1) is a reference oscillator or clock generator card.

A crystal oscillator on this card is frequency divided to

generate two synchronized reference frequency outputs, one at

0.8 KHz and one at 6.4 KHz. The 0.8 KHz output is wired to the

1/2 lambda discriminator card (CHl-8), the 6.4 KHz output to

the chopper discriminator card (CHl-7). The 1/2 lambda encoder

has aresolution of 64 pulses per revolution which sets the

motor speed at 12.5 revs/second. The chopper encoder resolution

is 128 pulses per revolution corresponding to a speed of 50

revs/second.

The discriminator cards compare the encoder output

pulse rate and phase relationship with the reference frequency

and generate an analogue error output voltage. This signal

is amplified and used to correct the motor speed and phase.

3.2.2 VELOCITY FEEDBACK

(Refer to Figure 3.1.1)

Although the phase discriminators regulate the speed

of each motor very accurately, phase sensitive feedback only

becomes effective when the motor speed is within range of its

normal operating speed. This is called the 'lock-in' range of

3.2.2 (Continued)

the phase discriminator circuit. When the motors are first

switched on a second, velocity feedback loop is used to acce­

lerate the motors up to approximately full speed. At this point

the phase feedback loops become effective and accurately

regulate, or trim, the speed of the motors.

Output pulses from the encoders are input to digital

tacho circuits in each motor control loop, card CH 1-8 in

Figure 3.1.1. These frequency to voltage converter circuitsr

generate an analogue output voltage which is proportional to the

motor speed. The gain, or transfer characteristic is adjusted so

that the velocity feedback loop regulates the motor speed to

a point within the 'lock-in' range of the phase discriminator.

3.2.3 PID AND POWER AMPLIFIER UNITS

(Refer to Figure 3.1.1)

Output signals from the phase discriminator and the

digital tacho are summed at the PID amplifier input terminal.

Any error signal is amplified by the power amplifier and

applied to the D.C. servo motor until the correct speed and

phase are obtained.

The PID control~er (Proportional Integral and Differential)

modifies the phase and amplitude response of the feedback loop

to ensure critical damping. Preset components are used to

allow the loop response to be exactly matched to the various

major system time-constants (for details refer to the appro­

priate circuit diagrams).

The power amplifier is a hybrid integrated circuit

which provides sufficient power to drive the D.C. motor directly.

A normally-open inter lock relay contact is wired in series

with the power amplifier output. The relay is only energized

3.2.3 (Continued)

if the cable connecting the power amplifier to its PID unit

has been properly mated and both the +15V. and -15V. power

lines are on. This prevents the motor from over-speeding if

one of the power-rails fail and the amplifiers saturate. This

interlock is particularly important in the case of the dia­

phragm control motor. Continuous high-speed operation of this

motor could destroy the ball bearing which is used to mecha­

nically centre the diaphragm wheel.

3.2.4 DATA CONTROL AND INTERRUPTS

(Refer to Figures 3.1.1, 3.2.4)

Although output data from the photomultipliers is

processed by modules in the CAMAC crate and transmitted

directly to the computer, timing signals must be supplied by

the hardware control system. These allow counting of the

photomultiplier output pulses to be synchronized with rotation

of the chopper wheel and 1/2 lambda plate. Interrupt signals

must also be generated to tell the computer when to sampIe

output data from the CAMAC system counters.

Both data control signals and interrupt pulses are

generated by the time base card, CH 1-2, shown on Figure 3.1.1.

The input timing reference for this circuit is derived from

either the chopper wheel or the 1/2 lambda encoder output

pulses. Selection between these two timing sources is made

automatically depending on the selected system operating mode.

When operating in the normal photometry or polarimetry

mode the chopper assembly is not used and timing signals are

derived from the 1/2 lambda encoder. Refer to the top half of

Figure 3.2.4. For each photomultiplier channel, 1-4, two

separate counters are provided in the CAMAC system. Using the

3.2.4 (continued)

1/2 lambda encoder position pulses (64 per revolution) each

channel of data is alternately switched between its two

counters. While data counts are being accumulated in one counter,

the computer reads the accurnulated count stored in the alternate

counter. This allows the computer to measure each channel

output at each of the 64 positions of the 1/2 lambda plate.

When operating in the chopper photometry mode timing

signals are derived from the chopper wheel encoder output

pulses. A chopper segment corresponds to 90 0 of the encoder

rotation, or 32 encoder position pulses (128 pulses per revo­

lution). Each channel of data is alternately switched between

its two counters at every 32 encoder pulses. While data counts

are being accumulated in one counter, the computer reads the

accurnulated count stored in the alternate counter. This allows

the computer to take 4 measurements per channel for each

complete revolution of the chopper wheel.

In the normal photometry or polarimetry mode interrupts

are generated at each position pulse from the 1/2 lambda encoder.

These are used to initiate data sampling by the computer. An

interrupt is also generated at each zero pulse to allow the

computer to synchronize data collection with the 1/2 lambda

plate position.

In the chopper photometry mode interrupts are generated

every 32 position pulses and at each zero pulse from the chopper

wheel encoder.

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3.3 DIAPHRAGM CONTROL

3.3.1

3.3.2

3.3.3

COMMAND FUNCTIONS

CONTROL LOGIC

VELOCITY FEEDBACK

3.3.1 COMMAND FUNCTIONS

(Refer to Figure 3.1.1)

The function of the diaphragm wheel and use of the

various manual controls was described generally in Section

1.2.2.

Refer back to Figure 3.1.1. Two sets of command lines

are wired to the diaphragm multiplexer, one set from the

manual control panel, the other from the appropriate RIOS IO

card. These lines carry the following command pulses :-

(INIT) initialize diaphragm position

(SET+) increment diaphragm position in UP direction

(SET-) decrement diaphragm position in DOWN

direction.

The diaphragm wheel is rotated by a D.C. servo motor

and located in each diaphragm position by a spring-loaded

detent pin. Each time the detent pin engages a position

switch signal 'POSSW' is generated. This indicates to the

control logic that the diaphra.gm is engaged in one of its 15

possible positions. When a SET+ (or SET-) command pulse is

received the diaphragm is incremented in the UP (or DOWN)

dlrection to the next detent-pin engagement.

An incremental encoder is also used by the control

loop for velocity feedback. This is described later in Section

3.3.3. When an (INIT)command is received the diaphragm wheel

is rotated to the zero pulse position of this encoder. This

position corresponds to diaphragm code 00. See section 2.

for a list of diaphragm sizes and types for each code number.

3.3.2 CONTROL LOGIC

(Refer to Figure 3.1.1)

Each of the three command lines (SET+, SET-, INIT) is

3.3.2 (Continued)

wired to a command latch, or bistable circuit, in the diaphragm

control card, CH 1-6, shown on Fig. 3.1.1. When a command

pulse is received on one of these three lines the appropriate

latch is set and further commands are temporarily inhibited.

When either a (SET+) or (INIT) command pulse has been

received the control card generates a positive D.C. output

on OIP pins R, 21, to the PID unit, input pins Y, 21. This

causes movement of the diaphragm in the UP direction. Conversely

"a (SET-) command generates a negative D.C. output to move the

diaphragm in the DOWN direction.

When the next diaphragm position is reached the detent

pin engages and a POSSW signal is generated. Provided either

the (SET+) or (SET-) command latch was set, the motor is

stopped and the input latches are cleared. The control card

is then ready to receive another command pulse.

If the (INIT) command latch was set, the motor is

stopped and the input latches are cleared. The control card

is then ready to receive another command pulse.

If the (INIT) command latch was set the motor conti­

nues rotating through each detent pin position until the

encoder zero pulse position is reached. The zero pulse is

then used to reset the latches and stop the motor.

As all position counting is incremental the zero

pulse position is used to reset the diaphragm position counter.

If loss of synchronization is suspected the diaphragm should

be initialized. (The diaphragm position counter is located

in the RIOS, see Section 5.3.2 ).

3.3.3 VELOCITY FEEDBACK

(Refer to Figure 3.1.1)

Velocity feedback is used in the diaphragm motor contro1

loop to limit the speed of the diaphragm whee1 to 0.2 revo1u­

tions/second. This a110ws the detent-pin sufficient time to

engage and disengage proper1y during rotation. One comp1ete

revolution through all 15 diaphragm positions takes 5 seconds.

Refer back to Figure 3.1.1 which shows the digita1­

tacho circuit, card CHl-6, in the diaphragm control loop. As

··the diaphragm whee1 may rotate in either direction (SET+ or

SET- commands) abipolar frequency to vo1tage converter must

be used. The frequency of combined (UP + DWN) pulses is used

as a measure of motor speed whi1e separate ~ and DOWN signals

are used to indicate the direction of trave1. These signals

are obtained from an encoder logic card in the RIOS as the

direct encoder output 1ines are 2 wire sine/consine types.

3.4 CHOPPER ASSEMBLY AND HEAD POSITION CONTROL

3.4.1

3.4.2

3.4.3

COMMAND FUNCTIONS

HEAD POSITION CONTROL

CHOPPER ASSEMBLY CONTROL

3.4.1 COMMAND FUNCTIONS

(Refer to Fig. 3.1.1)

The function of the rotatable head/baseplate assembly

and chopper assembly pivoting were described generally in

Section 1.2.2.

Refer back to Figure 3.1.1. Two sets of command lines

are wired to the input multiplexer, card CH2-8. One set pro­

vides control signals from the manual control panel, the other

from the appropriate RIOS IO card. These lines carry ther

following command signals :-

(HEAD CW) rotate head in CW direction.

(HEAD CCW) rotate head in CCW direction.

(SLOW/FAST) 2 speed head velocity control bit.

(IN/OUT) chopper assembly position control bit.

Both the head and the chopper assembly are controlled

by D.C. servo-motors. The chopper assembly is pivoted between

two limit switches, either IN or OUT of the light path. It

can never be left at an intermediate position. The head

assembly is rotatable through 1800 and can be accurately

positioned at any angle within this range. An incremental

encoder directly coupled to the head drive motor is wired to

a binary counter in an encoder card located in the RIOS. This

counter defines the head position and is directly accessed by

the computer. The computer generates angular head position

signals in 4-line BCD format and these are displayed on a 4

digit LED indicator on the handset, or at the operator's CRT

terminal.

3.4.2 HEAD POSITION CONTROL

(Refer to Figure 3.1.1)

The head position control logic is contained in card

3.4.2 (Continued)

CH2-10, shown on Fig. 3.1.1. This circuit generates a positive

or negative D.C. output to the PID unit, card CH2-12, depending

on the cornmand input signals (HEAD CCW) or (HEAD CW). Two

speed operation (FAST/SLOW) is provided by relay switching of

the PID unit input gain.

A digital-tacho circuit, card CH-ll, is used in the

feedback loop to provide proportional velocity feedback. This

bipolar frequency to voltage converter is identical to the

·circuit used in the diaphragm control loop, card CHI-G, des­

cribed in section 3.3.3. The frequency of combined (UP + DWN)

encoder position pulses is used as a measure of the motor's

speed.while separate UP and DOWN signals are used to indicate

the direction of travel.

The incremental encoder is also used to determine the

angular position of the head. A bi-directional counter in the

encoder logic card (located in the RIOS) keeps track of the

current head position and is accessed directly by the computer.

Two electrical limit switches are provided at each end

of the head's travel. These are positioned just before the

mechanical stops. When an electrical limit is reached the

power amplifier input is disconnected from the PID unit to

prevent the motor from rarnming the mechanical stop at high

speed. At the electrical limit the head can only be moved in

the opposite direction ('out of limit'direction). To avoid

possible mechanical damage in a fault condition this operation

is carried out at reduced speed.

3.4.3 CHOPPER ASSEMBLY CONTROL

(Refer to Fig. 3.1.1)

The chopper assembly is driven by a D.C. motor between

two limit switches. It is always either fully IN or OUT of

the light path. Refer back to Fig. 3.1.1.

The chopper assembly is controlled by three inter­

connected relays on CARD-A, located in the power amplifier

chassis. Card CH2-l0 contains LED couplers and buffer circuits

to isolate these relays from the control system.- It contains

no other logic concerned with control of the chopper assembly.

A single IN/OUT cornrnand line from the multiplexer is

buffered in card CH2-l0 and wired to a control relay on CARD-A,

input pins L, E. When the IN/OUT cornrnand line is at logic 1,

(+5 volts), this relay energizes and switches a +5 volt drive

signal to the D.C. motor. The motor drives the chopper assernbly

until the fully IN position is reached.

A further two relays are normally energized by the

two limit switches at each end of the chopper assembly's

travel. When a limit is reached the appropriate relay is de­

energized, thereby removing the motor drive signal. A small

holding torque signal is provided to keep the chopper assernbly

in the required position. The motor may then only be re­

energized in the opposite direction.

Two optical couplers in Card CH2-l0, input pins D, 4,

C, 3 are wired in series with the limit switches. They are

used to signal the computer, via an input register in the RIOS,

that the chopper assembly has reached one of its limit posi­

tions.

3.5 SHUTTER CONTROL

3.5 SHUTTER CONTROL

(Refer to Figure 3.1.1)

The shutter is mechanically switched between its two

states by a pulse-driven solenoid. A single-pole changeover

contact within the operating mechanism signals whether the

shutter is open or closed.

A single OPEN/CLOSE command line from the multiplexer,

card CH2-7, is wired to the shutter control card, CH2-9. This

card contains two monostable pulse generators triggered by a

negative to positive transition of the clock command line.

Two separate pulse output lines, card CH2-9, pins 1,5, are

wired to the drive module, COMPUR MOD-l 57004.

A change of the command line state from OPEN to CLOSE,

or vice versa, causes a negative-going pulse of approximately

20 mS duration to be output to the drive module on the appro­

priate line. The drive module amplifies the pulse and provides

sufficient output power into the solenoid to switch the shutter

from one position to the other.

The position of the shutter is indicated by two relays,

Kl, K2, which are energized by the shutter mechanism change-

over contact. Each relay is wired to energize aseparate optical­

coupler in the shutter control card, input pins 4,D,3,C, to

signal the appropriate shutter position to the computer and

the manual control panel indicators.

4. CONTROL SYSTEM CIRCUITS

4.1 COMMAND MULTIPLEXER CIRCUITS

4.2 PID UNITS

4.3 CONTROL CHASSIS 1 - CIRCUITS

4.4 CONTROL CHASSIS 2 - CIRCUITS

4.5 POWER AMP. CHASSIS ~ CIRCUITS

4.6 HANDSET CONTROL CIRCUITRY

4.7 C~LIBRATION AND ADJUSTMENTS

4.1 COMMAND MULTIPLEXER CIRCUITS

4.1.1 CIRCUIT DESCRIPTION

4.1. 2 LIST OF DRAWINGS AND CIRCUIT VARIATIONS

4.2 PID UNITS

4.2.1 CIRCUIT DESCRIPTION

4.2.2 LIST OF DRAWINGS AND CIRCUIT VARIATIONS

4.3 CONTROL CHASSIS 1 - CIRCUITS

4.3.1 CLOCK GENERATOR

4.3.2 PHASE DISCRIMINATORS

4.3.3 DIGITAL TACHO CIRCUITS

4.3.4 TIME BASE GENERATOR

4.3.5 DIAPHRAGM CONTROL CARD

4.4 CONTROL CHASSIS 2 - CIRCUITS

4.4.1 HEAD POSITION CONTROL

4.4.2 CHOPPER ASSEMBLY CONTROL

4.4.3 SHUTTER CONTROL CARD

4.5 POWER AMPLIFIER CHASSIS - CIRCUITS

4.5.1 POWER AMPLIFIERS

4.5.2 POWER AMPLIFIER INTERLOCK CARD B

4.5.3 CHOPPER ASSEMBLY CONTROL CARD A

4.6 HANDSET CONTROL CIRCUITRY

4.6.1 HANDSET WIRING

4.6.2 HANDSET CONTROL INTERFACE

4.6.3 INTENSITY CONTROL CIRCUIT

4.7 CALIBRATION AND ADJUSTMENTS

4.7.1

4.7.2

4.7.3

4.7.4

4.7.5

INTRODUCTION

1/2 LAMBDA SPEED, PRESET ADJUSTMENTS

CHOPPER WHEEL SPEED, PRESET ADJUSTMENTS

DIAPHRAGM WHEEL, PRESET ADJUSTMENTS

HEAD SPEED, PRESET ADJUSTMENTS

4.1 COMMAND MULTIPLEXER CIRCUITS

4.1.1

4.1. 2

CIRCUIT DESCRIPTION

LIST OF DRAWINGS AND CIRCUIT VARIATIONS

List of Figures

4.1.1 MULTIPLEXER CIRCUIT DIAGRAM

4.1.1 CIRCUIT DESCRIPTION

(Refer to Figure 4.1.1)

Figure 4.1.1 shows the circuit diagram of one of the

command multiplexer circuits (MUX). These circuits select a

group of four command lines, from either the manual control

panel or the RIOS, and output the selected group to the

appropriate control system, in this case the 1/2 lambda motor

control circuits.

Input command lines from both the manual' control

panel and the RIOS are shown on the left of Figure 4.1.1.

Signals C-3 to C-6 are the four manual command signals while

C-7 and C-8 are used for multiplexer control. Similarly RS-O

to RS-3 are the four RIOS output command signals, RS-7 and

RS (CLK) are multiplexer control signals. Input signals C-3

to C-7 from the manual control panel are all 'active low'

types (inverted) • They are normally at logic 1 (+5V). Pushing

a button or setting a switch to its active state causes the

appropriate command line to go to logic 0 (GND). Input

command signals RS-O to RS-3 from the RIOS are normal 'active

high' types (positive logic).

The heart o-f the circuit is an SN74157 integrated

circuit, Q8. Pin 1 is a control input used to select the

required inputs, A or B. Input pin 1 at logic 0 (GND) selects

lA to 4A. Input pin 15, E'NB, enables the four output lines,

lY to 4Y, when it is at logic O. When E'NB is high the outputs

are disabled (lY to 4Y set to logic 0).

Input commands may be either 'static' or 'dynamic'

types. A static input command, such as the one used to open

or close the shutter, is at either logic 1 or logic 0

continuously, permanently indicating the commanded state. A

dynamic input command must be pulsed or clocked whenever the

command is to be executed. Commands of this type are those

4.1.1 (Continued)

used to increment or decrement the diaphragm wheel position,

(SET+) or (SET-) ; open and close the shutter, etc.

The multiplexer circuit in Fig. 4.1.1 has its bridging'

links P7, P8, set for static input commands. Input signal

C-8 from the manual control panel (REM/RIOS switch) controls

the multiplexer circuit, Q8. When REMOTE operation is selected

C-8 goes to logic 0, QIO, pin 6 goes low and selects the l-A

to 4-A control inputs. The ENB pin of integrated circuit Q8

°must also be low to enable the command outputs, lY to 4Y.

This is true if either Q6, input pin 5 or 6 is high. With link

P7 (1, 16) wired as shown Q6, input pin 2 and input pin 3 are

both low during REMOTE operation. This causes Q6 output pin

1 to go high enabling integrated circuit Q8.

During RIOS operation (C-8 at logic 1) the RIOS

input commands, RS-O to RS-3, are only enabled if the enable

bit RS-7 is set to logic 0. This control bit allows the

computer to disable the RIOS command lines as required.

Dynamic commands are pulsed or clocked as folIows.

During REMOTE operation an operator sets a command line to

logic 0, (C-3 to C-6), and then pushes the appropriate clock

button (input line C-7). This action sets QIO, output pin 2

high, triggers monostable pulse generator Q7, input pin 2,

thereby generating a short negative-going enable pulse to

ENB, input pin 15 of Q8. This causes output command lines

lY to 4Y to be pulse-enabled.

During RIOS operation monostable pulse generator Q7,

input pin 10, is triggered as required by RS (CLK) , thereby

pulse-enabling the output command lines.

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TELESCOPI; PROJECT DIVISION

4.1. 2 LIST OF DRAWINGS AND CIRCUIT VARIATIONS

Five command multiplexer circuit cards are used in

the photometer control system. Although the basic circuit is

identical, different link connections are made on the cards

to cater for either 'dynamic' or 'static' input command types.

In order to distinguish between the different link connections,

and command/status line functions, an individual drawing is

provided for each different card. These drawings are available

in aseparate folder, titled DWGS. XI.

Multiplexer Function DWG No. Command Type

CHl-4. 1/2 lambda speed. XI.16 Static

CHl-5. Diaphragm position. XI.17 Dynamic

CHl-3. Chopper wheel speed. XI.18 Static

CH2-7. Shutter position. XI.19 Special*

CH2-8. Chopper Assy/Head posi- XI.20 Statiction

* Shutter control multiplexer : the bridging links

used on this card are special. The ENB pin of the multiplexer

is permanently grounded, P7, link 9-8. This results in static

commands on lY to 4Y output lines. A shutter command clock

pulse is generated on PCB connector B, output pin 11, for use

in the shutter control circuit (see section 4.4. ). This is

accomplished by bridging P8, link 11-6 and P7, linl 16-1.

Refer to DWG. XI.19 if this is not clear.

4.2 PID UNITS

4.2.1

4.2.2

CIRCUIT DESCRIPTION

LIST OF DRAWINGS AND CCT. VARIATIONS

List of Figures

4.2.1 PID UNIT CIRCUIT DIAGRAM

4.2.1 CIRCUIT DESCRIPTION

(Refer to Figure 4.2.1)

Fig. 4.2.1 shows the circuit diagram of the standard

PID (Proportional Integral and Differential controller) circuit

card. Identical cards are used for the 1/2 lambda, chopper,

diaphragm and head motor speed control circuits. Various

options and links are wired differently for each control loop

as required. These variations and a list of individual drawings

are given in the following section (4.2.2).

The function of the PID circuit is to control the

phase and amplitude response of each servo loop to obtain

best damping with maximum gain. The input terminal (IN-) of

the Burr Brown 3420L amplifier is the servo loop surnrning junc­

tion. An analogue control input signal from either the phase­

dicriminator (1/2 lambda, chopper speed control), or digital

control circuit (diaphragm, head speed control) is wired to

the PID unit, input pin Y. Relay RLl is used to switch the

input gain when 2 speed operation is required (head speed

control only). A potentiometer in each of these lines allows

the two speeds to be separately adjusted.

An analogue feedback signal from the electronic tacho­

circuit is wired to pin J, shown on the right of Figure 4.2.1.

Input pin C, shown on the left, is not used.

Potentiometer P4 is used to adjust the zero offset of

the input amplifier. It is also used as a final adjustment of

the overalloffset voltage for each servo system. Various

resistor-capacitor networks are used in the PID circuit to

modify its phase-amplitude response at different frequencies.

Potentiometer P3 allows the overall loop gain of the system to

be adjusted for minimum static velocity error and optimum

transient response. Caiibration settings and procedures for

adjusting potentiometers Pl-P4 are given in Section 4.7.

4.2.1 (Continued)

Diodes D3, D4, Zl, Z2 limit the maximum output of the

amplifier to ± 9 volts durin9 overload conditions. Diodes D5,

D6 prevent amplifier 'latch-up' during an input overload. The

interlock relay, RL2, is wired between the + 15 volt power

supply rails. Loss of power on one rail de-energizes the relay

and shorts the input line to ground. Test points Tl to T3 allow

the operation of the circuit to be externally monitored by

test instruments. They are wired via series-protection resis­

tors to prevent damage due to a short-circuit. A coaxial input

connector allows injection of a test-signal for transient

response and overall performance checks.

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4.2.2 LIST OF DRAWINGS AND CIRCUIT VARIATIONS

Four PID unit cards are used in the photometer control

system. Although the standard circuit-layout is identical for

each, different component values are used in the resistor­

capacitor feedback networks to frequency-compensate each

servo-loop. These values are specified on the individual

drawings of each PID unit, available in aseparate folder,

DWGS XI. See list below.

The speed control relay, RLl, is only wired in card

CH2-l2. It is used for 2-speed control of the head position.

The interlock relay, RL2, is wired in all cards except CH2-l2.

PID UNIT DRAWINGS

Card

CHl-lO

CHI-lI

CHl-12

CH2-l2

DWG.

XI.21

XI.23

XI.22

XI.24

Function

Chopper wheel speed.

1/2 lambda speed.

Diaphragm setting speed.

Head positioning speed.

4.3 CONTROL CHASSIS 1-CIRCUITS

4.3.1

4.3.2

4.3.3

4.3.4

4.3.5

4.3.1

4.3.2

4.3.3

4.3.4

4.3.5

CLOCK GENERATOR

PHASE DISCRIMINATORS

DIGITAL TACHO CIRCUITS

TIME BASE GENERATOR

DIAPHRAGM CONTROL CARD

List of Figures

CLOCK GENERATOR CIRCUIT

PHASE DISCRIMINATOR CIRCUIT

DIGITAL TACHO CIRCUIT

TIME BASE GENERATOR

DIAPHRAGM CONTROL CIRCUIT

4.3.1 CLOCK GENERATOR

(Refer to Figure 4.3.1)

The clock generator card provides various reference

frequency outputs for use by the 1/2 lambda and chopper wheel

speed control loops (in the phase discriminators), and by the

time base generator card. The function of these circuits was

described generally in Section 3.2. In addition the clock

generator card provides an output pulse-train at a frequency

of 10 Hz (100 mS intervals). These pulses are wired to one

~of the RIOS interrupt lines. They are mainly used to request

the computer to examine all manual input switches for status

updating. At intervals of 100 mS the computer looks at the

input switches for a change of status, thus recognizing any

manual input commands.

Refer to Figure 4.3.1 which shows the circuit diagram

of the clock generator card. A hybrid crystal oscillator

module generates a stable master output frequency at 640 KHz.

This frequency may be adjusted as required using the 100 pF

trimming capacitor connected between pins 4 and 5. Using

various counter circuits, integrated circuits 31, 40, 50 and

51, four different output frequencies are generated. Each

output is wired via a type 7421 monostable pulse-generator to

provide a train of narrow output pulses of approximately 2

micro-seconds duration. Both normal and inverted pulses are

provided from the Q and Q outputs.

Output connections B-A, B-l (PCB connector B, pins

A, 1) carry a 640 KHz reference signal to the time base card.

This signal is used to generate the time base, or counter

gating signals, for the CAMAC microscalers (N5, N6) when

operating in the half-lambda mode. It is also used for

synchronous speed detection as described later in this manual­

Reference signals for the 1/2 lambda and chopper wheel phase

4.3.1 (Continued)

discriminators are output on connections BC, B3, BE, B5. The

last signal is the 10 HZ interrupt pulse-train on output

connections B-H, B-7. A 7404 integrated circuit provides an

additional buffered output line for each signal if required.

Both the enable input (ENABL) and the external clock

input, shown on the left of Figure 4.3.1, are not normally

used. The enable input on pin 20 of PCB connectors Band C

allows the clock generator card to be inhibited if required .

• This input line should be shorted to ground if not used. The

external clock input (fully isolated) allows the card to

function using an external 640 KHZ frequency reference, for

example an observatory clock.

4.3.2 PHASE DISCRIMINATORS

(Refer to Figure 4.3.2)

Two identical phase discriminator circuits are used

in control chassis 1, one in the 1/2 lambda and the other in

the chopper wheel speed control circuits. The function of these

cards within the speed control loops was described generally

in Section 3.2.1. Each phase discriminator compares the output

pulses from an incremental encoder with a stable reference

frequency. An analogue output voltage is generated which is

proportional to the phase difference between the two signals.

This signal is amplified and used to correct the drive-motor

speed.

Refer to the bottom half of Figure 4.3.2 which shows

the phase - discriminator card. The upper half of this circuit

is the digital-tacho which is described in the following

section (4.3.3). The reference frequency signal is input to

pins B-12, C-12 (pin 12 of connectors Band C), shown on the

left of the drawing. Input pin B-10 is an enable input which

is not used, it should be left unconnected (equivalent to

logic 1). The encoder pulses are inp~t to pins B-14, C-14.

Two type 74221 monostable pulse generators, set for

a short pulse duration of 200 nS, are triggered by positive­

going transitions of the reference frequency and encoder

pulses. These two pulse-trains are used to continuously toggle

a flip-flop, Q7 upper, -between its two stable states as shown

in the inset timing diagram below. The clock pulse input to

pin 1, Q7, is delayed during its transmission-through two

gates (approx. 15 nS) to allow sufficient 'set-up' time for

the J/K preset inputs. Both Q7 and Q8 are edge-triggered flip­

flops, triggered by a negative-going transition on the clock

input, pins 1, 13.

4.3.2 (Continued)

NORMAL TIMING

fREF ~'-- -'--__---' _

fENC__...L--_-----.JI.....-_---1. L

Q7, pin 5

Provided the phase difference between fREF and fENC

is exactly 1800 the mark to space ratio of Q7,output pins

5, 6, is unity. The ~ output on pin 6 is gated to input pin 1

of P6, an open-collector type inverter. The RC integrating

filter following this gate generates an analogue output voltage

proportional to the mean level, or mark to space ratio, of the

digital input signal at P6, input pin 1. Provided the servo­

loop has 'locked-on' the phase difference between fREF and

fENC is maintained at 1800 , corresponding to an unloaded

analogue output voltage of approximately + 7.5 volts (at relay

Kl, pin 6). A phase difference error in either direction will

cause an opposing change in the analogue output signal to

correct the motor speed.

Integrated circuit Q8 consists of two flip-flops used

to register any phase error exceeding ± 180 0 from the normal

operating point. Provided the servo-loop has 'locked-on' both

U outputs of Q8 (output pins 6,7) will always be at logic 1.

Q8, output pin 6, would be set low if Q7, output pin 5 was

already high when an fREF clock pulse occurred (J input to

Q8, pin 3 would be high). This would indicate a phase-lag

error. Similarly Q8, output pin 7 would be set low for a phase­

lead error.

4.3.2 (Continued)

Refer to the inset diagram which shows the effect of

a sudden decrease in fENC, resulting in a phase-lag error

signal being generated.

1

2 3

I2 3

I I

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P6pin~

LCKERR

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fENC pulses 2 and 3 show a progressive amount of phase

error with respect to the reference frequency, fREF. At fREF

pulse 4 the next encoder pulse is too late to reset the toggle

flip-flop, Q7 pin 5, to its low state. This causes Q8, output

pin 6, to be set low during fREF pulse 4 generating a phase­

lag error signal.

P6, output pin 2 shows how the output mean level, or

mark to space ratio, increases to compensate the motor speed.

When the phase-lag error flip-flop is set the analogue output

is clamped at its maximum output level (+ 15 volts unloaded).

At fENC pulse 8 the motor speed has increased sufficiently

to bring the encoder pulses back into phase. At fENC pulse 8

the toggle flip-flop, Q7 pin 5, has not been set high. This

would normally cause the phase-lead error flip-flop to be

set but this is prevented by cross-coupling the Q output of

each Q8 flip-flop, pins 6~ 7, to the CLEAR pins of the opposite

fliP-flop, Q8 pins 14, 15. At fENC pulse 8 the phase-lag flip­

flop, Q8 output pin 6 is reset high by a high-level signal on

4.3.2 (Continued)

its K input, pin 2.

The LCKERR flip-flop is set by the clock pulse which

followed the PHLAG error signal (fENC pulse 4). This error

flip-flop remains set until cleared by an external clear

signal on input connection B-IS, (source RIOS or manual control

panel) .

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4.3.3 DIGITAL TACHO CIRCUITS

(Refer to Figure 4.3.3)

Four identical digital-tacho circuits are used in the

control rack. Refer back to Figure 3.1.1 which shows the

overall layout of the hardware control system. Cards CHl-9 and

CH2-11 each consist of a single card digital tacho circuit

used in the speed control loops for head and diaphragm posi­

tioning. The phase discriminator cards, CHl-7 and CHI-B, also

contain an identical digital tacho circuit (with.tpe exception

of component value changes). Each circuit is abipolar frequency

to voltage converter which generates an analogue output pro­

portional to the output pulse rate from an incremental encoder.

The polarity of the analogue output depends on the direction

of the encoder rotation. While bipolar operation is necessary

for the'speed control loops of both the head and diaphragm

wheel, it would not normally be required for the chopper

wheel and 1/2 lambda motors. These motors always rotate in

the same direction, however a standard circuit design has

been utilized throughout the system.

Refer to Figure 4.3.3 which shows the circuit diagram

of a digital tacho card. Four input pulses, shown on the leftof the drawing, are generated by an encoder logic card in the

RIOS. The output lines from the encoder itself are two phase

(sine/cosine) types and cannot be used directly. The.encoder

logic card processes these signals to provide separate UP/DOWN

count signals and a combined (UP+DOWN) pulse rate signal. A

multiplier on the card also allows the encoder resolution to

be increased by a factor of up to 4 as required. This option

is used to increase the diaphragm encoder resolution to 1440

steps per revolution (4x), while the basic resolutions of

the encoders is used in the other three control loops (lx).

4.3.3 (Continued)

Basic frequency to voltage conversion is achieved by

inputting the encoder pulse rate to a monostable pulse gene­

rator, P9. The mark to space ratio, or mean level, of output

pulses from this circuit will vary depending on the frequency

of the input pulse rate.

The direction flip-flop (DIR-FF) is used to route

the monostable output to either the inverting or non-inverting

input terminal of an operational arnplifier, Q2. The first

pulse received, either UP or DOWN, will latch the flip-flop

in its appropriate state. UP pulses cause a negative-going

analogue output (via the inverting terminal), conversely

DOWN pulses cause a positive-going analogue output to be

generated. The amplifier has a gain of 10 and is wired as an

integrator using feedback capacitor C3. As this configuration

iS only effective in the inverting mode aseparate integrating

capacitor, C2, is used to shunt the non-inverting terminal,

Q2, pin3.

DIAPHRAGM TACHO ADJUSTMENT : the procedures for ad­

justing all preset controls are given in Section 4.7, however

as the diaphragm wheel is stepped incrementally through each

diaphragm position the analogue output on test point TPl will

be a pulsed signal. When correctly adjusted, as specified in

Section 4.7, the diaphragm motor takes 0.2 seconds to move

one step. The analogue output at TPl will be a pulse of

approximately + 6 volts (depending on the direction of travel)

and 0.2 seconds duration.

During initialization of the diaphragm wheel position

the speed is constant while the control system searches for

the zero pulse position (as described in Section 3.3). During

this time the analogue output from the tacho circuit, TP1,

will be approximately -3.9 volts. The monostable output on

4.3.3 (Continued)

P9, pin 6, should show a positive-going pulse of approximately

420 micro-seconds duration, triggered at intervals of approxi­

mately 3.5 milli-seconds.

The following table provides useful information for

circuit fault-finding. It should not be used as a basis for

adjusting the preset potentiometers.

Measured Tacho-Circuit Parameters

MOTOR SPEED PULSE RATE PULSE DURATION ANALOGUE OIP I(RPM) (pulses/Second) (micro-seconds) (V. D•C at TP1)

1/2 LAMBDA MOTOR 750 800 300 - 8.2

CHOPPER WHEEL 3000 6400 34 - 8.2

HEAD CW FAST 0.6 2 + 0.5.. .-

DIAPH. INIT. 12 288 420 - 3.92

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4.3.4 TIME BASE GENERATOR

(Refer to Figure 4.3.4)

The time base card, CHI-2, generates timing signals

to control counting of photomultiplier output pulses by the

CAMAC counters, and also generates interrupt pulses which tell

the computer when to sampIe these counters. The general

function of this card was fully described in Section 3.2.4

which should be read beforehand.

Refer to Figure 4.3.4 which shows the circuit diagrarn

of the time base card. When 'operating in the chopper photo­

metry mode incremental pulses and a zero pulse from the chopper

encoder are used as timing reference signals. The incremental

pulses, input connection B-2, are wired' to a 7 32 counter

(Ql, Q2). An output from this counter is then wired via an

inverter to the clock input, pin 3, of the chopper 'toggle'

flip-flop, Q4 upper. This flip-flop ,toggles', or changes

state, at each positive-going transition of the input clock.

Multiplex selector gate Q6 is controlled by the

'Mode Select' input, connection B-9, which is at logic 1 in

the chopper mode. After each 32 chopper encoder pulses the

chopper 'toggle' flip-flop, Q4 upper, changes state causing

data control outputs A, B, (connections B-IO, B-II) to

alternatively route data between the two CAMAC counters. 32

encoder pulses correspond to one 90 0 segment of the chopper

wheel. At the beginning of each segment monostable pulse

generator QS is triggered and generates a 2 micro-second

(approx.) interrupt output puls~, CHAN, connection B-T.

The zero pulse from the chopper encoder, connection

B-4, occurs once per revolution and may overlap one of the. .incremental encoder pulses. Dual monostable circuit Q3 is

used to delay the zero pulse by approximately 70 micro­

seconds so that it occurs at an intermediate point between

4.3.4 (Continued)

two encoder pulses. A positive output pulse of 1.5 micro­

seconds duration from Q3, pin 5, resets the counter, Ql, Q2,

each revolution to ensure synchronization.

Section 3.2.4 described how the 1/2 lambda encoder

pulses are used to control data timing in the normal photo­

metry or polarimetry mode. The control timing diagram in

that section, Figure 3.2.4, showed how the AlB gating pulses

are simultaneously switched when no A-B separation ~s required.

The timing diagram overleaf shows the small AlB separation

period which is normally introduced by the time base divider

chain. This facility is provided to ensure a constant inte­

gration period for all 64 1/2 lambda positions, despite any

possible jitter, or timing variation, which occurs in the

1/2 lambda encoder pulses (this would only occur in a fault

situation). The time base divider is clocked directly from

the 640 KHz crystal oscillator signal, connection B-6.

Zero pulse U U-Channel pulse U U U U U

A· GATE ~ I I I I8 • GATE I I I I IP7 pin e LJ U U U u-

Q4 lower is the 1/2 lambda 'toggle' flip-flop which

is clocked between its two states by the 1/2 lambda encoder

pulses, input connection B-B. The encoder zero pulse, ·connection

4.3.4 (Continued)

B-D, is wired to the clear pin, Q4, pin 13, to prevent loss

of synchronization. It is also used as a computer interrupt

pulse, output connection B-U, in the 1/2 lambda mode.

Gates P8, input pins 9, 13, provide A-B separation

by disabling both the A and B gating pulses. P7, output pin

8 goes low during the required period. This facility is nor­

mally used and is enabled by input connection B-12, 'ENABLE

T.B. ', which is set to logic 1 by the computer (RIOS control

bit).

640 KHz clock pulses are input to the time base

divider via an enable gate, P7, input pin 4. At the beginning

of each 1/2 lambda position the synch flip-flop, Q8, is set

by an encoder channel pulse. This triggers a monostable

pulse generator, Q5 lower, input pins 10, 9. A negative-

going output pulse from this circuit on pin 12 loads an initial

value into the time base divider and sets the T.B. enable

flip-flop, Q7, input pin 3. At the next positive-going transition

of the 640 KHz clock the start flip-flop, Q7, input pin 11,

is set causing counting to begin.

With the binary switch settings as shown on Figure

4.3.4 the counter will generate an output pulse after 784

counts, corresponding to 98% of the duration of each 1/2 lambda

position. This provides 2% A-B separation. At the final count

a negative-going output pulse from Q12, pin 13 resets the

synch, enable and start flip-flops (Q8, Q7) ready for the next

lambda position.

The. time base error flip-flop would be set if the

next incremental encoder pulse.occurred before the time base

divider had reached its final' count. This could only occur. '.

if 'jitter ', or short term variations, in the motor speed

were greater than the A-B separation margin.

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4.3.5 DIAPHRAGM CONTROL CARD

(Refer to Figure 4.3.5)

A general description of the diaphragm control loop

was given in Section 3.3. This section describes the detailed

circuitry of the diaphragm control card, CHl-6, as shown in

Figure 4.3.5.

Each of the three command lines, input connections

B-13, B-14, B-15 is wired to a command latch or bistable

•. circuit Qll, Q12. When a command latch is set the appropriate

Q output switches to logic 1, and an active low signal is

generated on the output of 3 input NOR gate QlO, pin 8. This

low level signal sets the busy flip-flop, Q12 input pin 10,

and triggers monostable pulse generator, PlI input pin 1.

When the busy flip-flop is set the READY line goes

to logic 0 to disable further input commands. A negative-going

output pulse from one monostable pulse generator, PlI output

pin 4, loads the input command status into a four bit latch

(only 3 bits are used). Output status signals from this latch

are wired to the dia~hragm multiplexer card, CHl-5. The other

monostable circuit, P5 input pin 9, is initially triggered by

a very short negative-going input pulse det7rminedby the time

constant of a 150 ohm/2.2 nF RC network. Provided the diaphragm

wheel begins to move the monostable will be continuously re­

triggered by incremental encoder pulses on input .connection

B-8. In the event of encoder failure (or mechanism jamming,

etc.) P5, output pin 5 will go low after a 50mS delay

inhibiting all command output lines via Q4, pins 1, 4, 9.

Command outputs at Q3, pin 2, 4, 6 are all normally

at logic 0 resulting in zero analogue output to the diaphragm

PID card, o~tput.connectionA-R. Receipt ~f a SET+ or INIT

command causes -the appropriate gate output transistor! Q3 pin 2

or 6 (open-collector types) to turn off, thus generating a

4.3.5 (Continued)

positive analogue voltage of 6.2 volts (zener diode clamped).

As each output is wired via a large value series resistor any

measurement checks should be made across the appropriate

zener diode.

Receipt of a SET-command turns off Q3, pin 4 output

transistor and pulls the base of a pnp drive transistor posi­

tive, turning it off. This generates a negative analogue

voltage of 6.2 volts via the series output resistor.

SET+ or SET- command latches are reset when the next

diaphragm position is reached by an active low signal from

Q9, output pin 8. This normally results when a pulse is

received from nonostable circuit PlI, output pin 5. The

command latches waRd also be reset if any of the following

conditions occur : -

(i-) SET+ and SET- command latches set simultaneously.

(ii) PON signal generated at power switch on.

(iii) INIT command latch set.

The INIT command latch is reset by Q9, output pin 6,

when a zero pulse is received from the encoder, indicating

that the diaphragm code position 00. It would also be reset

if either the SET+ or SET- command latches were set or if

a PON power reset pulse was received.

After a command has been executed and the appropriate

command latch has been reset, QlO, output pin 8 switches

back to a logic 1 level. This positive-going transition

triggers the busy delay monostable P5, input pin 2. After a

delay of approximately 0.3 seconds the monostable resets

itself and ~5~ output pin 4 goes high clocking the busy flip­

flop to its OFF.state. In this state the status buffer'is

reset on P8, input pin 1, and the READY line is set to logic

1 to enable further command input pulses.

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4.4 CONTROL CHASSIS 2 - CIRCUITS

4.4.1

4.4.2

4.4.3

4.4.1

4.4.3

HEAD POSITION CONTROL

CHOPPER ASSEMBLY CONTROL

SHUTTER CONTROL CARD

List of Figures

HEAD CONTROL CARD

SHUTTER CONTROL CARD

4.4.1 HEAD POSITION CONTROL

(Refer to Figure 4.4.1)

The general operation of the head position control

loop was described in Section 3.4. This section describes the

head control circuit card, CH2-10, as shown in Figure 4.4.1.

Three input cornmand lines, shown at the top left of

Figure 4.4.1, are wired from the appropriate cornmand multiplexer,

card CH2-8. The slow/fast cornmand bit, input connection B-13,

is buffered directly via a relay driver circuit to output

connection A-H. This line is wired to the speed control relay

of the head PID card (see Section 4.2). The ENABLE line,

input connection B-14, should be left unconnected (equivalent

to logic 1).

The two direction control inputs, connections B-12,

B-1S are wired to the inverting and non-inverting terminals

of operational amplifier QS, ~ia ~nable gates Q6. With neither

input cornmand active the amplifier output, QS pin 6, is appro­

ximately zero volts. A CW input cornmand pauses the amplifier

to provide an output level of -9 to -10 volts, conversely an

output of +9 to +10 volts is obtained for a CCW cornmand.

This analogue output signal is wired directly to the head PID

unit input terminals, card CH2-12.

Normally closed limit switches at each extreme of the

head's travel (180 0 total) are buffered via LED isolators Q8.

The output from each isolator, Q8 pins 10, 14, is normally

at logic ° (GND) until a limit is reached. Reaching a limit

in either direction causes relay Kl to be de-energized via

Q3, input pin 1 or 2, depending on the direction of travel.

This relay normally connects the PID unit output to the power

amplifier input terminals, relay contacts 14, 8. When a limit. . "

is reached the 'relay de-energizes and the power ampli~ier is

driven by the 'out of limit' head rotation control circuit,

4.4.1 (Continued)

relay contacts 1, 8.

Operational amplifier Q4, output pin 6, generates an

output of approximately ~ 10 volts depending on which limit

has been reached. This output is reduced to approximately

+ 1 volt by a resistive divider chain to allow the head to

be driven slowly away from the limit switch. Por example,

when the CW limit is reached relay Kl de-energizes and Q7

output pin 8 goes high enabling 'out of limit' control by the

•. CCW cornrnand line, Q6 input pins 13, 12. If a CCW cornrnand is

subsequently given a small negative output of -1 volt, relay

Kl, pin 1, provides a low torque, low speed drive to the head

until the CW limit switch returns to its norrnally-closed state.

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4.4.2 CHOPPER ASSEMBLY CONTROL

The operation of the chopper assembly control relays

was fully explained in Section 3.4.3. The interconnection of

the chopper motor, limit switches, control card -A (in the

power arnplifier chassis) and control signal wiring was

illustrated in Figure 3.1.1.

Refer to Figure 4.4.1 in the previous section which

shows the head position control circuitry. The two LED iso­

lators and relay driver circuit shown at the bottom of this

drawing are used to interface control and status signals for

the chopper assembly with control card-A. A single IN/OUT

cornrnand line, input connection A-F shown on the right of the

drawing, controls the chopper assembly position. Buffer

circuit QIO, output pin 3; drives the position control relay

via output connections B-Y, B-l. Feedback signals from each

limit relay are interfaced viy LED isolators, Qll. The status

output signals, connector A, pins J, 8, K, 9 and the single

IN/OUT comrnand line are wired to the appropriate cornrnand

mutliplexer circuit, card CH2-7.

The shutter control loop was fully described in

Section 3.5. Figure 4.4.3 shows the circuit diagrarn of card

CH2-9, which provides an interface between the comrnand

multiplexer card, CH2-7, and the shutter control module/

relays which are housed in the power arnplifier chassis.

A single OPEN/CLOSE cornrnand, normal and inverted lines,

is wired to enable gates Q2, input pins 10, 5. These gates are

pulse-enabled by the shutter comrnand clock each time the

shutter is to be opened or closed. A negative-going pulse of

approximately 20 mS on output connection B-l opens the shutter,. .

while B-5 carries the close shutter pulse. Both these output

pulses drive the shutter solenoid via a power drive module,

COMPUT MOD 1-57004, which is housed in the power ampllfier

chassis.

4.4.3 SHUTTER CONTROL CARD

(Refer to Figure 4.4.3)

The'shutter control loop was fully described in

section 3.5. Figure 4.4.3 shows the circuit diagram of card

CH2-9, which provides an interface between the command multi­

plexer card, CH2-7, and the shutter controi module/relays which

are housed in the power amplifier chassis.

A single OPEN/CLOSE command, normal and inverted

lines, is wired to enable gates Q2, input pins 10, 5. These

gates are pulse-enabled by the shutter command clock each

time the shutter is to be opened or closed. A negative­

going pulse of approximately 20 mS on output connection B-l

opens the shutter, while B-5 carries the close shutter pulse.

Both these output pulses drive the shutter solenoid via a

power drive module, COMPUR MOD 1-57004, which is housed in

the power amplifier chassis.

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4.5 POWER AMPLIFIER CHASSIS-CIRCUITS

4.5.1

4.5.2

4.5.3

4.5.1

4.5.3

POWER AMPLIFIERS

POWER AMPLIFIER INTERLOCK CARD B

CHOPPER ASSEMBLY CONTROL CARD A

List of Figures

POWER AMPLIFIER CARD,

RELAY CARDS A, B

4.5.1 POWER AMPLIFIERS

(Refer to Figure 4.5.1)

The power amplifier chassis houses four power 'amplifier

modules which are used to drive the 1/2 lambda, chopper wheel,

diaphragm and head assembly servo motors. The interconnection

between these motors and their control systems was shown in

the schematic diagram of the photometer control system,

Figure 3.1.1. Two dual servo amplifier printed circuits, each

carrying two RCA HC2000 power-amplifier modules, are used in

~the power amplifier chassis. Refer to Figure 4.5.1 which shows

the circuit diagram of these cards.

Each HC2000 module is connected as a non-inverting

amplifier with a gain of approximately 33. The amplifier

output on pin 4 is fed back via a 22 ohm/IO micro-H compensation

network and an internal 18K resistor to the inverting input

terminal, pin 9. The 510 ohm shunt resistor connected between

pin 9 and ground defines the gain. Pl and P2 provide an offset

voltage adjustment of + 235 mV which is sufficient to correct

the maximum specified amplifier offset •.

Each amplifier output is directly coupled to the

appropriate servo motor. The resistance of the motor windings

vary between 9.5 and 20 ohms (see Section 2. •. for exact

values). Quiescent current consumed by each amplifier with the

motor disconnected should be 15-30 mA (30-60 mA per card) •

The output is internally protected against accidental short­

circuits.

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4.5.2 POWER AMPLIFIER INTERLOCK CARD B

(Refer to Figure 4.5.3)

If one of the power supplies to a PID unit fails, or

the signal cable between a PID unit and its power amplifier

becomes disconnected, it would be possible for the power

amplifier to saturate. This would cause over-speeding of a

motor, possibly resulting in mechanical damage. To prevent

this from occurring an interlock relay contact is wired in

series with each power amplifier output. These ie~ays are

only energized if the power supplies and signal cable to the

appropriate PID unit are properly connected. The general wiring

arrangement was shown in Figure 3.1.1.

Refer to the left-hand side of 'Figure 4.5.3 which

shows card B in the power amplifier chassis. Interlock

relays Kl-K4 are energized by the ± 15 volt power supplies

which are separately wired from each PID unit. Each interlock

relay energizes a second relay, K5-K8, which each have an

output contact wired in series wllh the appropriate power

amplifier output line.

In the event of a fault condition relays K5-K8 can

be independantly energized by bypass pushbuttons located

behind the power amplifier chassis front panel. THE BYPASS

PUSHBUTTONS SHOULD ONLY BE USED FOR MAINTENANCE TESTING,

PREFERABLY WITH OUTPUT CONNECTOR J9 REMOVED. This connector

carries the power amplifier outputs to each servomotor. Dis­

connecting the output cable will prevent any possible damage

due to motor over-speeding.

4.5.3 CHOPPER ASSEMBLY CONTROL CARD A

(Refer to Figure 4.5.3)

Control card A in the power amplifier chassis carries

the chopper assembly position control relays. The general

interconnection of the servo drive motor and its control relays

was shown schematically in Figure 3.1.1 and generally described

in Section 3~4.3.

Refer to Figure 4.5.3 which shows the detailed circuit

wiring of card A. Limit relays K4, K5 (12 volt)are controlled

indirectly by the normally-closed chopper assembly limit

switches (IN/OUT). In order to keep the current low in the

LED indicator circuit wiring (card connections N, H, P, U)

buffer relays Kl, K2 (12 volt) are used to drive the two

limit relays, K4, K5. Relays Kl, K2, K4, K5 are normally

energized except when the chopper assembly reaches a limit

position. For example when the fully OUT position is reached

Kl de-energizes, thereby de-energizing K4 to remove the

-5 volt drive from the motor. At the limit position two

27 ohm resistors across the contacts of K4 or K5 provide the

chopper assembly motor with a holding torque drive which is

sufficient to keep the entire assembly at the desired limit

position.

Control relay K6 (5 volts) is driven indirectly from

the IN/OUT control line (connections L, E) via buffer relay

K3 (5 volt). The motor drives the chopper assembly via a

60:1 reduction ratio gearbox. Although the motor is rated at

28 volts a switched drive voltage of ± 5 volts provides

sufficient torque and speed to control ~he chopper assembly

position.

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4.6 HANDSET CONTROL CIRCUITRY

4.6.1

4.6.2

4.6.3

4.6.1

4.6.2

4.6.3

HAND SET WIRING

HANDSET CONTROL INTERFACE

INTENSITY CONTROL CIRCUIT

List of Figures

HANDSET WIRING DIAGRAM

HANDSET CONTROL CARDS, CH2-1, 2, 3

INTENSITY CONTROL CIRCUIT, (CH2-1)

4.6.1 HANDSET WIRING

(Refer to Figure 4.6.1)

Figure 4.6.1 shows the internal wiring of the remote

control handset. A single Hughes 88 pole connector and cable

are used to interface the unit with control chassis 2.

Each pushbutton switch contains a filament-type bulb

which continuously illuminates the button identification

legend. They are all powered from the same supply, connector

pins 81, 82 and 74, 75, which is pulse-modulated to allow the

illumination intensity to be dimmed as required. An LED

indicator is also provided next to most of the pushbuttons to

serve as a function enable indicator (the control function

of each pushbutton and its associated LED indicator was des­

cribed in Section 1.2.4). The anode of each of these single

LED's is connected to a common power supply, connector pins

76, 77. The LED cathodes are separately wired to the appro­

priate input pin connections shown on the drawing. These inputs

are pulse-modulated signals to control the display intensity

of the single LED indicators (unlike the filament bulbs which

are controlled by a modulated supply) •

Each pushbutton has a single normally-open contact

with one common connection to ground, connector pin 86. The

other end of each switch contact is wired separately to pins

17 through 31. These switch output lines carry command signals

from the handset to the computer. They are wired directly

through control chassis No. 2 to an input register card in

the RIOS.

Two banks of HP 5082-7300 severr segment LED displays

are provided for the diaphragm and head position indication.

Each of these'"displays incorporates a BCD-7 segment decoder

and requires a j~ li~e BCD input (1, 2, 4,"8 binary weighted

bits). The anode'connections to all digital displays is

connected to a common power line, connector pins 71, 72, 73

4.6.1 (Continued)

which is pulse modulated by the same timing circuit which

controls the single LED indicator intensities.

The two SOK, lOK potentiometers allow independant

intensity control for either the LAMPS (filament-type bulbs)

or the DISPLAYS (LEDIs, both single indicator and digital

types). They are wired to the intensity control circuit on

card CH2-l which is described later in Section 4.6.3.

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(Refer to Figure 4.6.2)

Although pushbuttons in the handset interface directly

with the RIOS input lines, interface circuits are required to

buffer the output lines which drive the LED displays, both

single indicator and 7 segment digital types. Three twin 8

bit output registers in the RIOS generate the necessary output

control bits for all LED displays in the handset. These output

bits are wired via interface buffer circuits in cards CH2-l,

·2 and 3.

Refer to Figure 4.6.2 which shows the circuitry

carried on each of these cards. Output bits from the RIOS are

interfaced via HP 5082-4360 optical couplers to electrically

isolate the RIOS data transmission system from the control

circuits. Open-collector buffer gates, type SN 75453 or

SN 75454, are used to drive each LED. The enable control

inputs, connections B-K, B-L, may either be used to enable

output signals to the handset or for pulsed intensity modu­

lation.

Card CH2-l is used to buffer the signals to all single

LED indicators. Type SN 75453 gates are used on this card

to provide inverted outputs to each LED (aotive low types) .

Input connections B-K, B-L are used to pulse modulate the

outputs to control display intensity. The pulse modulation

circuit itself is also carried on card CH2-l but is described

in the following section (4.6.3).

Cards CH2-2 and CH2-3 are used to buffer the drive

signals to 7 segment LED displays in the handset. Type

SN 7543 gates are used to provide the active high outputs

which are required by the Hp·5082-7300 displays. The enable

inputs, conriect~;ns'B-K, B-L are not us~~: They are left

disconnected (equivalent to logic 1) to permanently enable

4.6.2 (Continued)

the output drive signals. Intensity control is provided by

pulse-modulating the power supply to seven segment displays

as shown in the following section (4.6.3).

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.. .. ESOIURO'.AN 'OUTHU. OIIUVATOAV.111I GINIVA •

TELESCOPE PROJECT DIVISION

4.6.3 INTENSITY CONTROL CIRCUIT

(Refer to Figure 4.6.3)

Figure 4.6.3 shows the intensity control circuit

which is included on card CH2-1. This circuit provides inde­

pendant illumination control for the filament-type lamps

(pushbutton legend illumination), and the LED indicators

(both single LEDIs and 7 segment types).

Two independant monostable circuits, IC 160, are

triggered repetitively by a 1 KHz oscillator, IC 171, output

pin 4. The timing period of each monostable is manually

adjustable by potentiometers in the handset to allow the

output mark to space ratio to be varied. IC 160, output pin 4,

provides a mark/space modulated power supply for the filament­

type lamps. Buffer transistor Tl provides sufficient output

drive current for all these lamps. As the transistor operates

in a switching mode it dissipates a relatively small amount

of power.

IC 160, output pin 5, provides a variable mark/space

pulse enable signal to control the intensity of all single

LED indicators. This signal is wired to the enable control

inputs of the appropriate interface buffer circuits, pins K,

L on the same card. Output connections B-T, B-S provide a

variable mark/space modulated power supply to the seven

segment LED displays.

Control of each monostable timing period is provided

by the remote potentiometers, connections B-15, B-M. At

maximum intensity the potentiometer is at maximum resistance

to reduce the current through each opttcal coupler, ICIs 141,.. "

151, to a minimum. In this state the timing period is primarily

determined by··the shunt resistance of PI, R68 or P2, R71. With

the remote pot~~tio~eters set at maximuffi"resistance PI" P2

are adjusted to obtain a 90% mark/space ratio. Reduc{rig the

4.6.3 (Continued)

resistance of each remote potentiometer increases the optical

coupler current and reduces the timing period, thereby

reducing the output mark/space ratio.

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TELESCOPE PROJECT DIVISiON

4.7 CALIBRATION AND ADJUSTMENTS

4.7.1

4.7.2

4.7.3

4.7.4

4.7.5

INTRODUCTION

1/2 LAMBDA SPEED, PRESET ADJUSTMENTS

CHOPPER WHEEL SPEED, PRESET ADJUSTMENTS

DIAPHRAGM WHEEL, PRESET ADJUSTMENTS

HEAD SPEED, PRESET ADJUSTMENTS

4.7.1 INTRODUCTION

The tables in the following sections list sufficient

data for all preset adjustments to be carried out on the

control circuits. This does not include the handset intensity

control circuit which was described in the previous section.

All measurements given in the tables are made with respect to

the system ground. They must be carried out in the order given.

When a measurement condition specifies that the

appropriate motor must be stationary or stopped it" is essential

"that the motor is at a complete standstill. If this is not

done errors will be introduced into the loop by the digital

tacho circuit.

P3 on the PID units should not be touched. These

potentiometers vary the return gain within each feedback loop

and have been optimally set for maximum feedback coupled with

good stability. If one of the feedback loops becomes unstable

P3 can only be re-adjusted by checkingthe dynamic stability

of the loop. This involves introducing a transient impulse

into the system, for example by injecting a pulse into the PID

unit summing junction, and adjusting P3 for optimum closed­

loop damping.

SECTION 4.7.2 1/2 LAMBDA SPEED CONTROL, PRESET ADJUSTMENTS

Note All adjustments must be made in the order indicated.

DO·NOT ADJUST P3 ON THE PID UNIT AT ANY TIME, see Section 4.7.1.

All measurements are made with respect to ground.. \

P2 on'the PID unit is not used.,PIon the PID unit has only a small effect and is not adjusted.

N PARAMETER ADJUST FOR PRESET LOCATION MEASURING POINT CONDITIONS

1 PID unit offset PID output = 0 volts P4 CHI-lI Test Point T2 Motor off

2 Power Amp. offset Power Amp. output=O volts P2 PA2 Connector Pin V Motor off

3 Tacho offset ( Tacho output = 0 volts P2 CHl-8 Test Point Motor Stationary,

4 Tacho Gain Mean Phase Signal PI CHl-8 LC. P6, pin 2* Motor on Loop locked= + 7.5 volts

,* In adjustment 4 use an avometer to measure the mean D.C. level.

SECTION 4.7.3 CHOPPER WHEEL SPEED CONTROL, PRESET AOJUSTMENTS

Note

,<

All adjustments must be made in the order indicated.

00 NOT ADJUST P3 ON THE PIO UNIT AT ANY TIME, See Section 4.7.1

All measurements are made with respect to ground.

P2 on the PIO unit is not used.

, Pl on the PIO unit has only a small effect and 1s not adjusted.\

N PARAMETER AOJUST FOR PRESET LOCATION MEASURING POINT CONOITIONS

1 PIO unit offset PIO output = 0 volts P4 CH1-lO Test Point T2 Motor Off, ,

2 Power Amp. Offset Power Amp. output=Ovolts Pl PA2 Connector Pin A Motor Off,

3 Tacho Offset Tacho output = 0 volts P2 CHl-7 Test Point ~1otor Stationary

,4 Ta<;::ho Gain Mean Phase Signal .

= + 7.5 volts PI CHl-7 I.C. P6, Pin 2* Motor On Loop Locked,

* In adjustment 4 use an avometer to measure the mean O.C. level.

SECTION 4.7.4 DIAPHRAGM WHEEL, PRESET ADJUSTMENTS

Note All adjustments must be made in the order indieated.

DO NOT ADJUST P3 ON THE PID UNIT AT ANY TIME, see Seetion 4.7.1

All measurements are made with respeet to ground.

P2 on the PID unit is not used. ,'"Pl lori the PID uni t has only a small effeet and is not adjusted.

N PARAMETER ADJUST FOR PRESET LOCATION MEASURING POINT CONDITIONS

1. PID unit offset PID output = 0 volts P4 CHl-12 Test point T2 Motor stopped

2 Power Amp. offset power Amp.output=O volts P2 PAI Conneetor pin 4 Motor stopped.

3 Taeho Offset Taeho output = 0 volts P2 CHl-9 Test point Motor stopped

4 Taeho Gain..

Pulse duration = :20t~ PI CHl-9 LC. P9, Pin 6 Initial. speed

5 - Step Speed Step duration = 0.2 sees P2 CHl-6 Measure duration Motor stepped -

6 + Step Speed Step duration = 0,2 sees PI CHI-6 at test point Motor stepped +r

7 Initial. Speed 1 eomplete revolution P3 CHl-6 on eard CHl-9 Initial. speedin 5 seeonds

* Refer to Seetion 4.3.3 if required - 'DIAPHRAGM TACHO ADJUSTMENT'.

SECTION 4.7.5 HEAD ASSEMBLY SPEED, PRESET ADJUSTMENTS

Note All adjustments must be made in the order indicated.

DO NOT ADJUST P3 ON THE PID UNIT AT ANY TIME, see Section 4.7.1.

All measurements are made with respect to ground.

P2 on the PID unit may be adjusted as final step, if required, to vary slow speed.. \

,~l on the PID unit has only a small effect and is not adjusted.

N PARAMETER ADJUST FOR PRESET LOCATION MEASURING POINT CONDITIONS

1 Head Control Offset Zero output Pl CH2-10 Q5 TEST POINT Motor stopped

,2 Out of limit Offset Zero output P2 CH2-10 Q4 TEST POINT Motor stopped

3 PID unit offset PID output = 0 volts P4 CH2-12 Test point T2 Motor stopped. ,

4 Tacho offset Tacho output = 0 volts P2 CH2-11 Test point Motor stopped

5 Power Amp. offset Power amp.output=O volts Pl PAl Connector pin 21 . Motor stopped

. 6 Tachq gain Tacho output = + 0.5 volts Pl CH2-11 Test point Motor CW fast,

5. RIOS AND INTERFACE (IO) CIRCUITS

5.1 INTRODUCTION

5.2 IO CARD DESCRIPTIONS

5.3 IO BIT ASSIGNMENTS

5.1 INTRODUCTION

5.2 IO CARD DESCRIPTIONS

5.2.1 TWIN 8 BIT OUTPUT REGISTERS

5.2.2 INPUT REGISTER

5.2.3 ON/OFF CARD

5.2.4 INTERRUPT CARD

5.3 IO BIT ASSIGNMENTS

5.3.1

5.3.2

5.3.3

HANDSET CONTROL

SHUTTER, HEAD/CHOPPER ASSY, DIAPHRAGM

1/2 LAMBDA/CHOPPER SPEED CONTROL

5.1 INTRODUCTION

The basic RIOS and LOCAL STATION circuits used for

bi-directional transmission of control and status signals

are fully described in the control manual of the 3.6 metre

telescope, first issued in May, 1977. Refer to '3.6 m. CONTROL

MANUAL', PART 1 section 6 and PART 2 section 6a.

Some of the 10 cards used in the photometer RIOS

are slightly modified types as shown in the drawings in

section 5.2. Information on the control word formats, 10

'addresses and bit assignments is given in section 5.3. Refer

to the 3.6 m. Control Manual for descriptions of all basic

RIOS circuits including : parallel driver and receiver cards,

control card and echo card.

5.2 IO CARD DESCRIPTIONS

5.2.1

5.2.2

5.2.3

5.2.4

5.2.5

TWIN 8 BIT OUTPUT REGISTERS

INPUT REGISTER

ON/OFF CARD

ENCODER CARDS

INTERRUPT' CARD

List of Figures

5.2.1-A TWIN 8 BIT OUTPUT REGISTER

5.2.1-B TWIN 8 BIT OUTPUT-REGISTER

5.2.2 INPUT REGISTER

5.2.3-A ON/OFF CARD

5.2.3-B ON/OFF CARD

5.2.4-A ENCODER CARD

5.2.4-B ENCODER CARD

5.2.4-C ENCODER CARD

5.2.5 INTERRUPT CARD

5.2.1 TWIN 8 BIT OUTPUT REGISTER

(Refer to Figures 5.2.l-A, 5.2.l-B)

A twin 8 bit output register is used to output up to

16 individual control bits from the RIaS. Three of these cards

are used in the photometer system to control all LED indicators

in the handset, both single LED and 7 segment display types.

Refer to Figures 5.2.l-A and 5.2.l-B which show the

circuitry of one twin 8 bit output register.

During a data output transfer 16 output b~ts are

·transmitted from the computer. Only the eight low-order bits

are available to carry data. The seven high-order bits are

used to specify the 10 card address while bit 8 is a flag

signal used in the RIaS control card for decoding the trans­

mission mode.

Connector B carries the RIaS output bus lines including

master clear and enable signals from the control card~ High­

order bits 9 to l~ are input to the address decoding logic.

Inputs to each of these two independent address decoders can

be independently wire-link selected to set each card address

anywhere in the range 001 to 176 (octal notation). Each

decoder must be strobed by an active low enable signal from

the control card. This ensures that the 10 card only looks

for its address during the correct time.

If an address decoder is satisfied during the strobe

period an output clock pulse loads the appropriate 8 bit

register latch from the data output bus, low-order bits 0-7.

Output driver gates provide both true and complementary

buffered output lines. The master clear signal is used to

clear all register latches to their off, or not true, state.

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5.2.2 INPUT REGISTER

(Refer to Figure 5.2.2)

Figure 5.2.2 shows the circuit diagram of the input

register card which is used to transmit command signals from

the handset to the computer.

In order to receive input commands from the input

register card, the computer first transmits a coded request

which informs the RIaS control card that a data input trans­

fer is required. The address of the input register card is

.specified in the eight low order bits, 0-7, of the 16 bit

request code, refer to PART 1, Section 6.1.4 of the 3.6 m.

control manual for exact details. The control card contains an

eight bit address register which is used to hold the IO card

address, ready for the subsequent data input transfer. Outputs

from this address register are wired in parallel to each of

the IO cards on the RIaS bus. These eight lines are referred

to as the 'input address'. More specifically, they are the

address of the IO :card which is being requested to input

data.

Refer to Figure 5.2.2. Seven 'input address' lines

from the control card address register are wired to address

decoding logic on the input register, connections B-l to B-14.

B-X is an enable signal. These complementary inputs may be

wire-link selected to set the card address anywhere in the

range 001 to 176 (octal numbering). When the computer requests

a data input transfer the address is 'held'. During the sub­

sequent data input transfer cycle the address logic is

strobed by an active low enable signal. connection B-X, from

the control card. If the address decoder is satisfied during

the strobe period an output pulse enables the tri-state out­

put gates (DM 8094). 16 bit data from the handset is then

loaded onto the RIaS input bus ready for transmission to the

computer.

5.2.2 (Continued)

All switches in the handset are electrically coupled

as shown in the inset sketch on Figure 5.2.2. The optical

couplers isolate the data transmission system from the pho­

tometer controls, preventing interference due to ground loop

currents.

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TELESCOPE PROJECT DIVISION

5.2.3 ON/OFF CARDS

(Refer to Figures 5.2.3-A, 5.2.3-B)

An ON/OFF 10 card allows both input and output of

data to and from the computer. Input and output lines are

separate, each being 8 bits wide. Transfer of data and

addressing is identical to the data input and output transfer

cycles described for the input register and twin 8 bit output

register cards respectively.

Five ON/OFF cards are used in the photometer system.

·Each card allows both control over one of the photometer

motor control loops (data output), and monitoring of the

control loop status (data input). They are used to control

the shutter, head and chopper assembly, diaphragm, 1/2 lambda

and chopper wheel motors.

Command outputs from each RIOS ON/OFF card are wired

to the appropriate command multiplexer for each control loop

located at the control chassis. A pulsed-enable signal, or

clock pulse, must"also be generated by the RIOS for use in

these multiplexers (see Section 4.1.1). Figure 5.2.3-B shows

how a positive-going clock pulse, output connection C-17, is

provided by taking an output from the address decoding logic,

IC 50,. pin 12, via buffer gate IC 40, output pin 11.

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5.2.4 ENCODER CARDS

(Refer to Figures 5.2.4-A, B, C)

Figures 5.2.4-A, B, C show the complete set of three

cards which are normally used in aRIOS station to interface

an incremental position encoder with the RIOS. All three of

these standard cards are used for each of the photometer

encoders although all of the functions provided on each card

are not required.

Refer to Figure 5.2.4-B. SINE/COSINE and zeropulse

.signals are input to three differential line receiver

circuits. These three input signals are transmitted from the

encoder on twisted pair lines. The zeropulse signal, ZP, is

processed directly through a pulse-former (monostable circuit,

IC 50). The multiplier logic on this card can be used to

generate an UP or DOWN count pulse at each positive or

negative transition of the SINE/COSINE signals. However, this

maximum multiplication rate would only be needed if ~he

maximum possible encoder resolution was required. The actual

number of pulses generated per input cycle depends on the

setting of the multiplier control inputs. These are wire­

link selectable on the board and the wire-links to be made

for each encoder are shown at the bottom of Fig. 5.2.4-B.

The other two encoder cards, Figs. 5.2.4-A, C,

contain pre-counters, counters and computer addressable

control logic which is not normally used in the photometer

system.

.,,, llK

IO'W .'W

. ,~•• '0" I' I 101$ ~. 11011

J SN74193.6

@[""

.. I 10 "

31 21 •" • C D

.1

,r-

~. ,-"" - ,I

I"I

®

I&/10/ &/ @ I

I •••• 1 I I:J ...1 _1.1 In I

L -.L -l

r,IIII

I

"I

I 131

'" I.

,,, @ I.... ~,.. +-t

I

!@

I.. I" "

@··'·..·ff:t @!L ---'-- J

r

SCAlEIAC10R

21 ,I ,I r

H ,., 111 I

rl .1 1 1 ~ IS~:475®]11 141 111 •

21 31 11 7

rl .11" I®I21 :11 ,

11 1.1 111 •11 ,., 111 •

21 31 1I r~·

,., tU •

21 31 11 r

r{ J iI ~J iL- @ I rl I21 31 .1 1

11 I" 111 llII I I1 1.1 111 •

21 JI 1I 1

U rl ®I41'13@l.1 '.1 11/ •

'I 31 •·u,-" 51'00.

'0 I I I I I I I I I I I I I I I I I I I I I I Iu.,~ Dft s,,~

.' ...1

., 0 .. 11 141 11010

rI I 4 1101 13

1IIIII12" @.lJ , • tt I I

, I. 1101.3

11111112 , • h

\BI! •• 11 I

I I. I tOl IJ

1111111" "@I! •• " I

t 1 411011:1

11 [ I" I2 , • '@l3 1 • U I I

, 14110113

111 ".112 -.: ~ I_

3 , • 11 I

1 I. 110 113

11111112 , • '@ I3 • • " I

1 I. 110 I 13

11111112 , 9 ~

\SI DM 8094 1 •

.8! •• 11

..'

7. '10"'2A • Conneclor

, • 1 • • 10 t1 I'

............ .,........

Fig. 5.2.4a S - 103

0"..., Encoder Addresses and Multiplier· 3.6mPHOTOMETER (DIRECTION + COUNT)

.. ESOtUflOP'rA'" SOUlHllIIN OBSUIWAlO"" 1111 GrNr~" n

TELESCOPE PROJECT DIVISION

C· Conn.c tor -,

l'J

see ORAWfNGCS-f -037'-1/3

~:I

~tPii

CNT

A·Connectoi i !

-+A

~~ SN74~8

I I I Z"

. ~

I • ,_ 11 I I I I do .....n

I r-\.JII' I"p

5·103

".."',..

ES0 ~~~~;~~U~H~~~~'~'~~~O~'. ~;~GI'~~~~

O>to<" Encoder Addresses and Multiplier • 3.6mPHOTOMETER (DIRECTION + COUNT)

L...L....

SN 74121

r':

Fig. 5.2.4b

'__ I .'1\1

__ .a.... , .u 11

, , ., l--4--J

SN" 12\I fBODpI

I (40) I I I I UlK ! I @

-I -j -,,] Y--H I ®I I I I I 7 14

1151 15

l'OOpfI

1"'"

• ®

MUlTlPL FDR 112" • 1a

• CHOPP· h

, OfAPH. ,.

t HEAQ • 1.

~

I ,I ~_J

II~~L......r i I III1 '

'----,I • I

tD--+-1

fl .,I i "L>" I I

L..~~~~_J

®c

..---

~

~

~

I

:~lIla CARO OlM

Y

F

•• 0

~ 11000"'J

~

IfJlTfPLlCATlON I JUMPERS @

I. -AI-IlO-CD-oo

Ja-AI - 81- CO-oo

,.-AI -BI -CI -01

. .

.1"...._, ..~.--. .

J ® '00"", I ®I

I I J I SN7408SN 7404 II II .I

I IIII IL _________ J

OM8820

....

....

6

t

14

I1ly

2t I '

II1

IIIII! T

3.I

4

1

II 5

,~~~. t Ie1 11 ~

U••'0_" ICNn.. r----'I 1"'_ I

N"",O.'.

S -103

11

Z" Slro~.

9

1~ ••• e-•• lnl

Up Of On Sirob.O~

es .-oJ7. ·IIJ

.2 0111 Cu".nl03

CO'llM.'x, 0111

NI",.'

.......Au.

0 ... :

~I"~,..i~,

ISN 1431 i

III

IL .J

SN 1400

'0

I SN 1437 IL .J

@

Fig. 5.2.4c

"

700

230

IL ..J...

SN 7400

r-----'I @II " It:::!r'"J--1cl..-,.I I

ISN 7421 I

IIII

SN 1430

SN 1430

.."

" I

2.1

,.

.1 AOOII

..'

"

I1 @I:L ..J

U -ADDlIt O.COD,. to, CU..lNT COUNTU

r-------,1,1 @! I

,0

r------,11 @I:,0

x~ I

B·CONNECTOR

AOOII IUS

0 ...." Encoder Addresses and Multiplier· 3,6mPHOTOMETER (DIRECTION + COUNT)

ESOIUIIO,IAN SOUTHflltN OI""VATOII't. 1111 C(N(VA U

TElESCOPE PROJECT DIVISION

5.2.5 INTERRUPT CARD

(Refer to Figure 5.2.5)

Figure 5.2.5 shows the circuit of the interrupt card

used in the photometer RIOS. Three interrupt signals are

generated by the photometer hardware. The 100 mS interrupt

pulses (10 Hz rate), connections C-D, C-4, are generated by

the clock generator card (see Section 4.3.1). This interrupt

signal is used by the computer to periodically monitor the

state of all command buttons in the handset.

Channel interrupt and zeropulse interrupt signals

from either the 1/2 lambda or chopper wheel encoders are

input on connections C-B, C-2, C-C, C-3. These signals are

selected automatically by a hardware multiplexer (see Section

4.3.4) depending on the selected operating mode.

Two monostable pulse generators shown at the bottom

of Figure 5.2.5 are provided for interfacing slow input signals... ~

These are not normally used for trephotometer interrupts but

are available if required.

5.3 10 BIT ASSIGNMENTS

5.3.1

5.3.2

5.2.3

HAND SET CONTROL

SHUTTER, HEAD/CHOPPER ASSY,"DIAPHRAGM

1/2 LAMBDA/CHOPPER SPEED CONTROL

HANDSET ENABLE INDICATORS

COM"""~ OUT(LOW)

15 14

l Iy

AOQR 100, - a ~ er~ ~..

~.. !i• ~ :I ~~ • ... oll. , . . , .... ... ... .. .. .. ... ..

\ IY

ADOR 101,

CO.......NO OUT

(HIGH)I I , ,

i E 0

~oll

~ !:! d ~

0 5l ~~ ..• ::> •... ...~ Ö>: >: oll. , . , I... ... ... ... ...

15 14 13 12 11 10

HANDSET HEAD POSITION

15 14 13 12 11 10 oCO""MANO OUT

(lOW)

~02

,cl ;;- ci- ~"J

•01

\ IY

AODR 103,o g ~ 2~

04

o 2 ~

~03

CQM.....NO OUT(HIGH)

COM""ANO OUT(lOW)

15 14 13 12 n 10

s 2 12~

02

HANDSET OIAPHRAGM POSITION

r-r,-i-------------------'-i-'-'I I I I NOT USEO I I I I~_~_L_L ~_~_L~

~01

HANDSET COMMANDS

"'il1-'-~

\J1

w•I-'

STATUS IN

AODR 123,

~ ~ ~ E .. z .. I ~

ioll ::> i!: ! &u - u 0 ~ - - 0 a !i- - d 0 ; .. .. :n:n~ ~ ~

; ~ olloll oll

~er er

~oll

l!! ... •5l g ~

0

~ i ~ l .. S:• .... ~ 0 Ci s ~>: >: u u,,'NOTE THE STATUS WORO (....)

"UST BE COOtPlE"ENTEQ TOCDRRESPONO TC THE FOR.. AT INOICATEO

(OUE TO STRUCTURE OF INPVT REGISTER CARO")

....._w I 1100:';,

AJPf'I•. I .J.' 11

"-IM:

""'"A_5-103

es- E-OB15

ObJKI. PHOTOMETERRIOS COMPUTER CONTROL WORD FORMATS

.. .. ESOIU"QPIAN IOUTHIlUI Ollr"V"'TOIIlY. 111\ QrNrVA ..

TELESCOPE PROJECT DIVISION

SHUTTER CONTROL

15 14 13 12 11 10 o 15 14 13 12 11 10

CO".....O

(OUIl

StAtuSON)

\. JY

AOOR 1066

Ii

u....HI I-0..........

I

l:$

igu~

~'Blä, I-0

o~zlt'o~

'":>1Il

z

&IX...~

"~u

~s1Il

~d

ffi

~

HEAO • CHOPP ASSV CONTROL

15 14 13 12 11 10 o 15 14 13 11 11 10

CO.....ANO(OUT)

1L- __-y--

ADOIl 10'6 g~~

~~

!ä• I

>->­"''''~~10­015:z: :z:UuI ,-0

~ ....t~I I_0

iJuu.~z8~!t

ee:~

~

19i~.. 0l[ ii, I-0

ä.~

~

l

~

S

~o

'i::;

~'J!

o..t

STATUSeIN)

DIAPHRAGM CONTROL

STATUS(ltlI)

fw

i g~ eiil u

I

; ;

~ ~

T •iw

I~11

gg~ ..~gz '".. 0l[ Ir, .-0

§f~..~

I .

; ;

~ '!~ ~ö ö

l:$l!zou

~1Il..Zw

11 10

1'--- -y---AOOR 122a

15

COM"4ANO(OUT)

~ THE ACTUAL STA1US WORD (,IN')

"U5T BE (O"PLE.. ENTED 81

CO",PUTER TO CORRESPOND TO

THE DNE5 INDICATED HERE 0

THI5 IS ouE 10 THE ON/OFF CARDSTRUClUAEIl

PHOTOMETERRIOS COMPUTER CONTROL WORD FORMATS

~ C()I41ANO ,ouT' 15 CO"F'UTER _ RIOS - OEVICE

COto4MANO .n~· IS COMPUTER~ AIOS""'- OfVICf

Fig. 5.3.2

_'._n I I~:-~,,~. I J•• "

Oltjel;t:

......:

"" S-103

..-es - E -0816

" .. ESOIU.O'IAN 'OUT"UlJIl OIUIiVAToav, 1111 GlHl"'" U

TELESCOPE PROJECT DIVISION

1I2h CONTROL

15 '" I] 12 11 10 s 8 7 6 5 4 3 2 1 0 15 14 13 12 11 10

CO"''''NO OUT STATUS 11 JO I K I K I K I K I K I K I • I K ·1 • I • I I I 1 I I I I I I I ..

---...., ... ...~

Il: 0 ...g ...~AOOR ",, ...

~ ~.. ...

~ " ~IX U ~g ~IX

B 0~

0IX IX :H - .. ! ~15 .. u~

~~

~~ ~a l ~

:H ... :H.. .. ,-l ~ l01\ S ....

I zol\z .. ~ ..0 :H.. .. ;: ~ii ... ~ "• I I N i ! N.. !'f ~;;,

! .. _0.. ..Z Z.. .. ..

CHOPPER CONTROL

~..~...

INI I I I

... 0...~

..~

~ i ~ ~.. .. ..:H~

01\ 01\

~ ~ ~o. e, o.

~..

~ ~01\

0 l %U U

1]

I i IOUT STATUS

I I I I

......Her

~~15

0 I I~ -0..~ ....

I % 3~u.. .. IX IX

~ ~w ..

z ~~w w

1011121314

v . --y ,

AOOIl117, g~u

15

CtMoWiO

I-:j....aq·

AllENTION CO....ANO -.OUT' FROM co..PUTER_ RIOS - OEVICE--- CCM"ANO OR STATUS ,IN' FRQO< OEVICE _ RIOS - CO"PUTER

• tHE ENABlE CONtROl BIT ENABlES OR OISABlES tHEENTIRE GROUP OF BITS IN THE COMMANO wORO"

NOTE lHE AC1UAl StAtUS WORO (,IN')-- "UST BE CO"PlEMENTED TO

CORRESPONO TO tHE FOR""l 'ND'CATED HERE

(OUE TO RIOS ON/OFF CARD SlRUC1URE)

\.J1•VJ•VJ

........0__

D••: N...:

S -103

..-es - E - 0817

WORD FORMATS

.. ESOlu.ort"N IOuTMtalN O.I.IlIVA'OIllV. 1111 QIIIiIlI\IA ..

TELESCOPE PROJECT DIVISION

6. INTERCONNECTION WIRING

6.1 CO~~ROL CHASSIS No. 1

6.1.1 Cab1e J50-J10 connections

6.1.2 Diaphragm contro1

6.1.3 t wave p1ate contro1

6.1.4 Chopper contro1

6.2 CONTROL CHASSIS No. 2

6.2.1 Shutter control

6.2.2 Head and chopper assembly control

6.2.3 Handset, switch input

6.2.4 Handset, LED indicator control

6.2.5 Handset, Head position contro1

6.2.6 Handset, Diaphragm position'contro1

PHOTOMETER ~ :l!: l!l

JCONTROl CHASS N~ 1 '" I! 0e: a: z ..s ~ s z 3 z 8 .;, ..0 z u u0 ~ ;= .. '" uu in N U t> j; ..

~ u " ..z .... u .. " ~CABlE J50 - J 10 .... '" + z .... ci .... a:u - z~ a a:

i.5 '" Ö N

:I: s 8 s " 0CONNECTION 0 '" a: It .~

a: '" a:'" ~ 5 '" ~ '" J: a:

~ (.0.... oe ~ 0 0 5 0 N

~ M! :z:! ci ~ ci ci.. u

CARO~SIGNAL J - 10 J -11 J - 14 J -18 J- 22 CHI-6

01_ EI<COODI (A) :x- -X:-------(i)

(8) :x- -X:------(I)

(lP) .x X:(I1l1

· (POSSwl :X- X 8- '----- ------ ----- -----· (~I 8-6

· (SPAllEl

· ISI'illYI 17

CHCPP ENCOOER (AI :x- -X:------ -----(A)

(8) :X -X:----- -----IBI

a.P) ::x -X:------ ------(p)

HEAO ENCOQEA \A) 42

IA) 54

(8) 43

(I) 55

a.P) 44

1%1') 56 6

112" ENCCOEA (CHAN I :x- X:------- ------- ------(CHl!l)

IZPI :x- -X:----- ------ ------(p)

NOT USEO 3J

34

J5

:Mi

HEAO L"'T (CCW)

COMMO'l 8

HEAO UMIT ICWI

C\lNo4ON 10

CHOPP AssY IIN) "CCINNON 12

_ ASS'10UT1 13

COMOolON 14

CHOPP AS5' (NCI n

(NC) 2J

CHOPP ASS' INCI 12

(NC) 24

+5YOI.T (Y« )25 }70 JlH:l1ON BOX l Ye<

Gl'IO (C0f04"0N1

I~TO JlJt<CT1ON 80ll

.. 11 .. " 11 " 11

Fig. 6.1.1

PHOTOMETER'" ~

'!

~...0 ~ ,CONTRQ CHASS. N2 1

~ ~ i e, Ir '"Z .. J: U.... U "- 15 e,

~... . .. <5 .. oez ...

~ 15 Ir0 ött 15 - ~ J: "-u

"- J:g I\! g !:\ z u 0 5252 ~ 0 ..:!- ö :>: u Ö Il:

~ e--OIAPHRAGM CONTROL~ 5 '" 3 '" ~ M0

\i 0CARO CARO CARO CARO e... u ii /f

~SIGNAL J -12 I J-13 J-14 CH1-S CHl-6 CHl-9 CHl-12 J-1S

• sv ('lee) 1,13

CllM4 IGl<OI 12,24

"01- 0 3 I-l

N08-1 4 B-"

"01- 3 S B-N

.. 01 - 3 6 B-P

MelK 7 B-S

"OB a B-A

"'B - 0 1S B-Z

"'.1 - 1 16 B-6

"'1- Z 17 B-'

"'1- 3 11 B-S

M,a--, ,., B-I

"'1- 15 zo 1-7

AOB- 0 Z A-l

ROB-, ("" C.. NOI • A-"

A08 -Z (SET. C"NOI 6 A-N

ADe -3 (SET - C><NO) I A-P

~ CENAaI lS A-A

AOSTAOIlE 33 A-S

A'B- 0 17 A-l0

(GI<OI 18 j..

AIB-I 19 A-ll

(GNOI zoj..

All- Z 31 A- t2

(GNOI ZZ ...1-AIB-3 33 A-13

(GI<OI Z. j..

R18-4 2S A-"

(GHOI 26 j..

AlB -15 31 A-16

(<;NOI 32 ...1-«;NO) '1 j..

fGHOl .2 j..

TACNO OUTA-J =LA-J

IGNOI A-8 A- a(SET .1 B-13 B-13

(SET -I B-l' B-"

lIN1T1 B-1S B-1S

(Eiii8(1 B-B B-B

IENiälI B-J B-J

I Ellll J B-A B-A

(SEr."1 B-O B-O

C«r=1 B-E I-E

liiiil'l B-F B-F

.11 " " I' .. 11

Fig. 6.1.2a..

I N

PHOTOMETER '" ~'" ~0 Z 0:CONTROL 01ASS N~ 1 öl ~ .... x .... ..... ! ~ iz ... ~ ..

~ e:;: .... !:! Cl.5 Cl. '"'" g -e ~ ....

~ g '" i5 l! ! 0 j;!~- lS Cl. x

~s :! u

~ ~DIAPHRAGM CONTROL ~ ~",0: '" ~

.... 0 ;! r--~~0... .... Ci. ... MCARD CARD CARD CARD

~SIGNAL J -12 J-13 J- 14 CHI-5 CHI- 6 CHI- 9 CHl-12 J - 15 J - 10

llIAPtt~ 8-6 "CIN'tt POS SW 8- , ..

8-1 8-1

COOlTAOt. OUT 4-R 4-Y

GHll 4-W 4-21

E_. lACHO &-5 8-5

UP+ON 7 8-1

Oll , 8-2

fii , 8-]

2P 10 8-A

.15Y 4-4

-!!SY 4-8

'NTtRloca Co, 4-E 7

- C-) 4-0 5

""'-OU74-F.J= 1

(;HO 4-1 2

l".fO ".12

.

<

.. 11 .. " ., 11 "Flg. 6.1.2b

I Ia: a:

I~ ...l!lPHOTOMETER ! '"

~~~ ~

1 :ll 1 8CONTRQl CHASS N? \ ~ ~ a: 1 ;;; 0

~§ .:..J u

:>l u~

sI . a: u '"z E g '" " .. % '"1 ...8 0 ... N ~ .. ~ z ui

...~ N U Z ~N :5 Cll

~ !::> i ..g 15 ;! a:

~ " ~ e 0 5 ::>

~a: e z

~ 0 i !:! j !:! a:1/2 h CONTROL g ~a: ~ S ;:: .. G: '"

er'" '" u~ .... CO~ 0

~ ~ '" e l 0~

u !f ... ~ Ci MCARD CARD CARD CARO CARO

J;ctSIGNAL J ~ 20 J-21 J-22 CHI-\ CHI-2 CHI- 4 CH1-8 CHI-ll I J-23 J- 24 J- 25 J-26

+ 5. teee1 1,\J

<:0_ (GNllI 12, Z4

MOB- 0 J B-L

11408- r 4 B->4

--Z 5 B-N

MOB-) 6 B-P

....CLK 7 B-S- 6 B-R

wIe-0 15 B-Z

W'B-I 16 B-6

W'B- Z 17 B-4

W'B -J 18 B-5.M18- 4 19 B- I

W'B -& 20 B-7

ROB- 0 Z A-L

ROB- I 4 A-W

ROB-Z 6 A-N

ROB-) e A-P

~ 15 A-R

R05TRQeE JJ ..-sRIB- 0

+17 A-l0

llöllOI m.J..

RIB- I

f " A-n

IGNol 20 ....

AlB-Z

+ZI A-n

IGNOI 22 ....

RIB-J

+23 ,,-\3

IGNllI Z4 ....

RIB - 4

f2S A-"

IGNOI 26 ~

RIB - 15

+J1 A-16

IGHOI 32 ~

..... 01 .,IGNDI 42 ....

ENAllL. TIMe BAse B-I2 B-I2

€H9l.. 1B s'" eRR FF B-15 B-15

eN8(. 112" ORI~ B-O 8-'

EHBI.. PHASE eRR FF B-" B-lS

PllAse LOCK B-O B-H

PH. LeK. eRllOR FF B-e B-j

PHAse lAG B-B B-K

PHASE LeAD B-A 8-L

1.P • ON 7 B-I

iJl B 8-2 -

llii , B-J

2P lO 8-0

GNO ".'Z ~

TB S\"N. eM FF B-F B-F

IIZ" CHNf B-B B-14-

.. " .. .. " ..Fig. 6.1.3a

PHOTOMETER

CONTROL CHASS. N21

1/2 h CONTRQL

SIGNAL

, .. C......

t» T 8

) - 20 ) -21 )-22CAROCHI-l

8-C

8-A

CAROCHl-2

..:>:I

CAROCHl-4

CAROCHl-8

8-1Z

Q

it

CAROCH1-11 ) -23 )-24 )-25 )-26

P'O - DuT

- 15Y

1-'TB- GATE IA'

T8-GATE 18'

A10S IMTE-.PT C.... N

ZP

RIOS

.. .. .. "

8-10

8-11

11

A-J --E?-A-J

A-I -L A-I

A-T -V A-Y

A-16 -L A-21

A-F --E7-'A-I....l- 2

A-S

A-E

A-O 4

"

BNC

~

-----

..

eNe1':"\

Fig. 6.1.3b

PHOTOMETER

CONTRQl CHAss. N21

CHOPPER- CONTROL

SIGNAL

• SV (vcc)

_-0WOll- I

10<011- Z

"08-J

..Oll

"'11- 0

"'11-1

"'11- J

"'8-J

"'11-4

R08- 0

ROI - I

R08-Z

ROlI- J

ROSTROllE

RIB - 0

(GNO)

(<;N~)

R18- J

«;NO)

Rl8-J

(GNOI

(;NO)

lGHOI

(GNO)

SEL TB 50URCE

DiBL. CHOPP 10401

ENBL .....SE ERA FF

PHASE LOCK

PK LCK ERA FF.

PHASE LAG

PHASE LEAD

ll1i

l.P

I CHOPP 01AN

J -16

1,0

".."20

J -17

a

15

JJ

f "1I~

1 "i 20 J.-

f :: .L­

i :: J.-

f 25

Z6 J..-

.1. JI

T J2 ..J.-

41 .....

J -18

10

CARO

CH1-l

I-E

CARO

CH1- 2

B-9

8-4

B-Z

CARO

CHl-3

B- L

11- ..

I-N

B-P

8-S

B-R

B-J

B- 6

B-4

8-5

B-I

B- 7

A-L

A-N

A-P

A-R

A-S

A-n

A-O

A-1'

B- 12

8- IJ

8-14

1-0

I-E

8-B

8-A

CARO

CHl-7

8-9

8-15

I-H

8-J

8-K

I-L

8-1

1_2], I-J

1-\4

. 1-12

CARO

CHI-IO J-19 J- 28

mM

... " ..8-20 .J.-

.. lt " ..Fig-. 6.1.4a

PHOTOMETER

CONTROL CHASS N21

CHOPPER CONTROL

SIGNAL

TACHO SIGNAl,.

(;NO

COHTROI. SIGNAL

<iNO

PlO-OUT

(;NO

'15V

-15V

..TUllDOl (.,. (-}

I l~ ~:I ~

~ ~)-16

A-Il

A-E 7

1.-0 3

.. .. .. .. " ..Fig. 6... 1.4b

J~

g

.."....tI..

PHOTOMETER 0

I0;-

i cl ~ CI: ~ ~CON TROL CHASS. N~ 2 z~ :: '" '"~

~ JI" 12 12 '" ~g g g ~ ~ g ~

g '" ~ ~! '" CI: 5 ~i g i

~ ~v

§ ~ " ~ i? ..CI: Q " ..SHUTTER CONTROL .. CI: :I V .. .. v .. ..

0CARO CARO "SIGNAL J-35 J-36 CH2-7 CH2-9 J- 27 J- 2& J-37 ~

·5Y l'kc I 1.1]

tON .. Ic.HOl 12 t 24

--0 ] B-L

--, ,B-"

I"08- 2 5 B-N

woe-] 6 B-P

"CLK 7 B-S- • B-R

..,e-o \5 B-l

WII - I 16 ! 8-6

I"'11- 2 17 8-' II

M.8· J 11 B-5 I

""8= " " B-I

"'11- 15 10 B-7

ROII- 0 t A-L

ROB- 1 , A-"

RQB- 2 6 A-N

- RQ8- ] I A-P

~ 15 A-R

ROSTROBE J] A- S

Rle- 0

+17 A-tQ

(GHOI II.!-

RIB- I

+" A-n

(CHIlI 20 .!-

RlB-2

+21 A-12

GNO 22 .!-

A111- )

+2) A-n

GNO 24 j...

A18- 4

+25 A-\4

G'oO 26 .J...

RIB - 15

+]1 A-16

....01 32 .J...

lGHoI 4\ .!-

(CHIlI 42 .!-

oPENIQD5f 5HJIT 0101 B-12 B-12

t""ll a.tK B-n B-ll

S>Mt CJ'[Ii 8-0 B-I

5HJIT mzm B-II B-'

m (~N) B-E B-A

li!'>V (tlDSE) B-F B-E

OPEN c..NO. B- 1 r-..I

tLOSE twhO B-5 I \ ), }(;HO 8-6

'(2

T5HUTt POS '9II1~N) It:~:

]

SKltT P05. 5'" (~Nl 4

5HUn P05 '911 ItlOSED) r+:~:I

5HUTT P05 5'" (tul5EO) t

Fi .' 6.2.1

PHOTOMETER..;::

0 0: +

~CONTROL CHASS. N~ 2~ ~

z s 0

" !~

i u ~ ~ ~ ~ ~ '" ~1.

0 '" '" \I! 0 i ~If ... ~ E ~-e ~ ; ~ '" '" 15

~u IJ! ~ ~ i

uI 0: ~g ... g-

~Q. s ~ ~ l2~ ~

0: Q. ~ ~ ~ ... '" ~HEAD AND

~15 ; s g u 0

~u i u

~ ~~ ~ ig '" ~ s 3 u u I! a: .. ~ ~ .. z

CHDPP ASSY CONTRCt. 0~ 8 ~

..-u Ii 0: ... Q. Q. .. --f

CARD CARD CARD CARD

SIGNAL J- 29 J-30 J-31 CH2-8 CH2-lO Oi2-n CH2-12 J-32 J-33 J -27 J- 28 J-34 ~

+5Y l\O:cl '.13

COMCCHlI 12,24

Noe- 0 J II-L

Noe- , • 8-N

MOlI- J 5 II-N

10011-J 6 8-P

MCL. 7 8-S

Noe • 8-A

M'a· 0 15 8-J

W18- 1 " 8-6

N'II- J 17 8-'

w,e- 3. 11 8-5

N'II-' " 8-'

N'II-15 JO 8-7

AOII- 0 J A-L

A08- I • A-N

AOII- J 6 A-N

ROll- J • A-P

mr-7 15 A-A

_TROllt: JJ A-S

A111-0

+: j.

A-1O

/QC))

AII- , t: j.

A-n

....0)

A'II- J

+JI A-U

nJ...

lGNO)

Ale- J

+U A-13

IGNOI "j.AIII- 4

+J5 A-\4

IGNllI "j..A111- 15

+:n A-ll

IGNoI JJj.

lGHIl) 41

....0) 42

HEAO ~ LEFT II-a 8-a

HEAO~ AIGHT 8-15 8- 15

HEAO ~ ISLOW-FAS71 8-0 lI-lJ

(>fOPP ASSt I IN - 0Ul) 8-\4 8-F

Hml"Lill lew) S-8 11-8

Hub LI" leew) S-F 8-E

b'iti'P lßy· h 8-E 8-.

(AM ASS, - OUT 8-A 8-J

CHOPP ASS' CONTROL B-A J

CHDPP ASS' CONTROL s-, ,

... .. .. .. .. .. ..

Fig. 6.2.2a

PHOTOMETER

CONTROL OiASS N02

HEAD AND

CHOPP ASSY. CONTROl

o~:z: 5l...

:z:

oIl:

SIGNAL J - 29 J-30 J - 31CARD I CARDCH2-8 i CH2-1O

CMDCH2-11

CARDCH2-12 J - 32 J- 33 J-27 J-28 J-34

CHOPP ASSY (OUT)13

0<0l'P AM' (OUT)

000Pl' ASS' (IN)

~ ,t8-0

T8-4

11

HEAD ll.. ICCW)

HEAll ll.. (CC"')

~ .8-lT8-'0

HE1.0 LI" lC")

HEAO UM IC'" ) 10

A-H1.- H i~

'(I. - .7 ~----+-A- 21GNQ

Sl.OW· FAST COHTROl

Pto- INPUT

1'10- puTPU'

I. - ,'(

HEAO COHTAOl OUTPUT I. - J

(;NO I. - 8 -+----+----+-ZIHTERUIlClI (., 1.- E

INTERlOO< (-) I. - 0

'ACHO SIGNAl. I. - J A-J

I. -8 1.-8

EHABl 'ACHO 8-S 8-5

9-'8-Z

8 -3

Z P (N C, 10

(;ND ".'Z ..L-HEAD ENCOOER (I.'

HEAD ENalllER (1)

HEAD ENCOOER (8)

HEAD ENCOOER (ß)

HUO ENCCOER (Z P)

HEAll ENCOOER (Zl')

'-yyy-­Z .J.JI...A..__

3-yyy--­,..Ä.A-A---

Syyy-­,..A.A.A-__

---yyy-'--..A.A.A.- Z

----yyy-3--...A..A..A..,---yyy-S--....Ä..A..A.- ,

DIStRI......,V (RED)

AM'\.IFlER 0' ('Ell )

POWER - 6V (BlUE)

SU'PlIES 5HlElD(8UOl~ 4

.. 11 .. 11 11 " ..Fig. 6.2.2b

PHOTOMETER '" I I'" 0 I I. a' e, t;j N

~J i ..

CONTROL CHASSIS N~2 i !2 g J: 0 l;3 '" Gm 0

~ ~0

~ :j ;: a:G ~ G Si g ~ ;r

~z

i'! ':'J:

~Z

S u~

~8 lj! ! I

wu a S!

5 '" 0 J

~'" ~ '" § 0 s:~

0-

'" a:1 '"Q 0 Ö '" Ö Q

~HANOSET SWITCHES lr-P a: Ci oe l; Ö a: ...N

CARO CARO CARO CARO ~

SIGNAL J -39 J - 38 CH2-1 CH2-2 CH2-3 CH2-4 J -40 J- 41 J -42 ~

18- 0 1 17

CQlO) 2J-

111- , 3 11

IGNlI 4 .J-

18- 2 5 19

«;NDI 6J-

.8- 3 7 20

(GHO) IJ-

18-4 , 21

«;"01 10 J-

18-5 11 22

(GNlI . 12 J-

18-' n 23

CQlOI 14 J-

'8-7 15 24

J:,I<O) 16.J-

18-1 17 25

(GI<O) II J-

e- , 19 26

(Qj01 2OJ-

.8 -10 21 Z1

CQlOI uJ-

'8-11 23 21

«;1<0) 24 J-

IB-12 25 29

lQlOI 26 J-

IB-O 27 30

((;HOl 21 J-

IB-\4 29 31

o:;HOl 30' J-

lB-15 31 32

lGHO) 32 .J..

.

;:

." " .. " It ..Fig. 6.2.3

PHOTOMETER h

'" ~::. g ~

~CONTROl OiASSIS N22 '" ~::

~

~ 0 g ~ ga; iii z .. äl ~ ~'" a 0 z!2 i!; u ~ z 11 z ~ i! 0 .0 •;l;

~z

~ 5 ~ u ~0 ~ ~.~ ! !2 w '" ::<u

~ ~'" :< '"HANDSET LED § s 0~

0 t 0~

~i" '" ~ ~ '" ~

~0 (\')- INICATDRS CDNTRDL 0 0 0 i!; :< Ö :< Ö a:e .. e .. ... -..:

CARD CARD CARD CARD

~SIGNAL J - 39 J - 38 CH2 - 1 CH2 - 2 CH2 - 3 CH2- 4 J-40 J - 41 J - 42

oe- 0 A- 1

08 - 0 A- ..

öä=I .. - Z

oe - 1 "-8

lliI-'"f ..-)

oe- 2 "-C

~ "-4

oe -) "-0or-4 ..-s

08-4 "-E

~ "'6

oe-~ A-F

~ "'7

08- ,

~ ....oe- 7 .. - J

ilB-="1 "'9

oe-. A'K

Olr-J

oe·, A-L

ör-1O"

oe-o

lllr-Tf

08-11

~

08-12

OB-13

OB-O

~

08 -14

~

OB -15

(0) - (LED''NOlCAlOAI B-A

111 - (LED-INOlCATOIlI B-B

IZI - ILED -'HOOCATOll) B'C

(3) - ILED -INlllC..TOA) B-D 4

(4) • ILED -'NOOCATOIl) B-E

(5) - (LED·INlllCATOA) B-F

I&)- (LED-'NOOCATOR I B-H

(7)- (LED-IND1CATOA) B-J

la)- ILED"NOIC"TOA) B-I

(9) • ILED-"DlCATDR) B-2 10

(0) - (LED-'NOOCATOAJ B') 11

1111- (LED'INOOCATOAI B'4 n

(12)- eLED-'NDIC"TOIl) B-5 0

(13) - (LED-'NOICATORI B-' 14

(141- ILED - ..OIC..TOIlJ B-7 15

(15) - (LED-INlICATORJ B·a 16

.. 11 .. " 11 " 1.

Fig. 6.2.4a

PHOTOMETER'" '"i5 0. 0 Cl. .,

CONTROL CHASSIS N22 er Cl. :;; ~

'" ~% 0 0

,jj s z ~ 0 Cl. '"'"~ '" ~ .. er 0

'"~ 9 co 9~

U% 8 0 z :l .;.,z z er 0 %

U

!.,-

! !2 0 :;; u :;; u9 :;; :; '" '" ~HANDSET lED

'" ß '"er '" u 0 er. 0 IJ.' i8 z e z

'"z

'" ("")0 0 .. 1 .. 0-INDICATORS CONTROl ä ~ ii .. ;< ;!: Ö % Ö er~"-

CARD CARD CARD CARD

SIGNAL J- 39 J-3B CH2-1 CH2-2 CH2-3 CH2-4 J - 40 J - 41 J -42 ~

tNfENS OtsPl • INO AC! B -15 63

INTENS. LAMPS AOJ B-" 64

(.1 'NTENS AOJ B-N 85

(.) SW'TCH ,>AlT B-P 66

(•• ) .NTEICS ~sPt.. • IN) B- T/S (11,72,13)

( .... "'TE"5 L....PS B -""U 174,15)

QlO (CO""'J") (16,79,60,61,6 (;NO

(76,77) ~, V<c

~(AT REAR PANEL)

B-R l,GM)B-16

t<TENSITV GATE(LID NlICJB-~3

INTENSIT' "CO il'lPllT (A) B-'

t<TENSII"f MCO ".PUl (8) B-L

B-WlXlveeB- YJZ

Fig•. 6.2.4b

~

~

PHOTOMETER ~

~ ~.. ~..

CONTROL CHASSIS N22 .. 31S 0 0

~zäi ~ ~ ~ IM "~ Si z

~..

~ ..8 '"~ si z -: ~ :I u

!. ! s ... 0oll a:HANOSET HEAD

~oll

a: ~ It ~oll 0 .. '" 51POS. DISPLAY Q Q~ J:: i5

~a: a:~CARD

~SIGNAL J - 39 J-38 CH2 - 2 J- 40 J-41 J - 42

1 irE=11 '-m--- --Je('-''EAD POS (l)

08 -0 2 --- --- ' A-A

ölr-1 Jm--- A- 2HEAC POS (2)

4 L __08-' A-8

eir-II

SXXi--A-J

HEAC POS (4)08-2 6 .,.--- A-C

C8-"lI

'xx;---- A-4HEAll POS (I)

Oll- J I ~--- A-D\

~I'JX;---- ---j(xA-S

HUO POS (I)

---: A-E08-4 10 ---

~ .ti:.:I

--"JiA-6MUD POS 121___ I A-F08-5 12 r---

~I i.

13U....._- A-7MUD POS (41

~ ~---08-1 A-M

lllr-7

.~--- 1.-1HEAIl POS CI)

08- , 16 --- A-J

~ 17 --- A-,MUD POS (10)

08-1

:4-=--=A-K

I

llIr-1 I

MUD POS (20) ---nA-

1O

08 ., 20 --- -- A-l

~2'XC~--

!HEAO POS «0)

---nA-,I

oa- 11 22 --- --- A-M

llir-11 I2JXXC-- 1.-\2MEAD POS (BOI

08 - n 24 --- A-N

1Olr-il 25 1.-13

MEAC POS. (100)08 -12 A-P

M7J3 A-IioMEAll POS (200)

oe-o A-A

~ 1.-15HEAD POS I_I

08-'. A-S

~ A-16MEAD POS (800)

oe-15 A-T

(0) HE.6O POS QUA ... 10,,1 8-A J7

(I) HEAD POS [»JA 2 a'O"t B-B Ja

(21 ~ POS.QlC'A '.10"'1 B-C J')

(J) ~ POS OlTA•• a ' B-D 40

(4) 'EAD POS OoAl'A , B-E 4'

15) HEAD POS DO.TA 2 8-F 42

(I) HEAD POS DO.TA 4 8-M 4J

(71 HEAO POS DO.TA I B-J ..11) 'HEAO POS. [)UA ,.10' 8-' 45

U) HEAO POS OATA 2.10 1 B-2 4'

(t01 'EAD POS DO.TA ,.,0' a-J 47

(11) HE,t.O POS OlIA e• .,1 B-4 ..(121 HOl> POS CATA ,. Ir! B-S "(IJI MUD POS DATA 2.10' B-' 50

(~I HEAOPOS DO.TA 3.rci B-7 S,

(15) HEAO POS DATA 4. 'l:)' B·I 52

.. " .. " 11 11

Fig. 6.2.5

PHOTOMETER;::

äi '" ~ '"äi 0 ".. '" .. :Jl ..I ~ 0CONTROL CHASSIS N22 z ~ 0 d r eS 0 .;. i~ ! ~ g ~ g e,

~z

~ ;!: r z i! z i! .;, s:u 0 0 u 4.§ ~ 8 Si

~ &u :;; u :>:c '" 0

HANDSET DIAPH a: ;;; § u 0 ~ 0 ~a:

'" z Ö~

z ...0

~ 9 i! '" .. '!! i2POSIT()N DISPlAY Ci a: .. ;!: 0 " 0 LnCARD CARD CARD CARD -.:

SIGNAl J- 39 J - 38 CH2-1 CH2-2 CH2-3 CH2- 4 J - 40 J - 41 J - 42 ~

ar=w 4-101APH. "0 11/

OB- 0 4-4

~

CllA~' .No 121OB-I 4- B

iii"='JtuPH IHG 141

OB-2

~

OOAPtt I>() (81OB-3

öä=4 4-S00AAt l>() IIlI

OB- 4 4-E

l5lr-'J 4-611IAAt '10 1201

O8-S 4-F

~ :XXOIAAt INO 1401OB-6

~ :XX 4-801AAt 'NIl (1I01

OB- 7

i58=1 :UIN C IOB-' 4-K

lllr-"1 4-10IN Cl

OB-' 4 - L

1llr-1ll 4-11IN CI

OB-li 4-"

lilr-1l 4-12IN CI

OB-n 4-N

i5r-"12 A-t1(N CI

OB-12 A-P

OB-O A-14

IN C IOB- D A-R

iilr-l4 4-1510l CI

OB-14 A-S

t'I!r-"1S A-16(Ol CI

OB- IS A-T

101 0IAAt DSl'I. DAU I B-A 51

111 llIAPH 0I5P\. lloI1A 2 B-B 54

Cll OW'H 0I5P1.. DATA 4 B-c 55

13I 0IAAt 0I5P1. DATA 8 B-o 56

141 DIAPH OIsPL DATA ... .,· B-E 57

(SI tuPH 0ISl'L DAT4 2.10' B-F S8

(61 0&AAt OISPLDATA , J1'O' B-H S9

(71 0IAF"t OOSl'L DATA So 0' B-j 60

181 B- 1 61

(91 B-2 62

1101 B-3 6J

lnl B-4 64NC

112l B-S 6S

1131 B-6 66

(14) B - 7 67

I1SI B - 8 U

Fig. 6.2.6

APPENDIX - Manufacturer's data sheets.

HP - Computer side HPCC - s ide

Standard HP - Connector Amphenol 57 - 30360( 48 pins) ( 36 pins)

pin numbers signal name . pin numbers

)BIT: 0 ..

2 ) .. 23 ) 2

3... -4 ) 3 .. 45 ) 4

5...- 6 ) 5:J .. 6u, 7 ) 6 ... - 7z

8 ) 78•

<r 9 ) 8.- • 9<r 10 ) 90 .. - 10

11 ) 10 11..12 )

11 .. 12

13 )12

13.. -lt. ) 13 .. 1415 )

14 .. 1516 ) 15 16• -23,AA ) FLAG 17..

GND ... ENASLE Man.Z/C (lC,)24 )( IC2) - - "'18

or GND ...A ) BIT : 0 19...B ) '" - 20

C ) 2 21... -0 ) 3

22..E )

423..

.- 5::> F ) ... 24c,

) 6.- H .. - 25::>

) 70 J " - 26

K ) 8 27<r -.- L ) 9 28<r0 M ) 10 29.. -

N ) " 30• -p ) 12 31..R ) 13 32..5 ) 14 33..T ) 15 34.. -22,Z ) ENCODE 35• -BB ) GND ... ....

36

eABlE BETWEEN HP COMPUTER AND HPCCCERN-NP)72-16A4

15,7.75 Borcard

TYPE 1004A~ocrer

Inhibits all Scaler inputs

C (With S2) Clears all Scalers andLAM's when rear panel switch isset to 'Yes'

AO Scaler IAI Scaler ZAZ Scaler 3A3 Scaler' 4

LAH = Overflow of Scaler 1+2+3+4and (when enabled) from the trai­ling edge of a Common Gate signalResponse. See functionsResponse. See Functions

QX

G:'3;j~~i:mf;rCJ• Selects module station number

Suppresses LAMZ (With S2) Clears all Scalers and

LAM's. Oisables Common Gate LAM

I x Single Camac module width

+6V, ~A,2.A-6V, 0.6A

Lemo 00250 sizeMating part: 002~Of (Borer StockNo. 141-514), not supplied withthe module

dc to >IOOMHz guaranteed501 max.3ns min.Esone/Camac Norm for terminatedsignals (EUR4100.7.2.2)I x 500 and2 x high impedance. bridgedNegligibledc

4 x 16-bit. orI x 32-bit + 2 x 16-bit. or2 x 32-bit

3ns min.Esone/Camac Norm for terminatedsignals (EUR4100.7.2.2)2 x high impedance. bridged3ns max.

Connections

ConnectionsGate de lay

Connectors

Inter-input delay differenceCoupling

Dimensions

Power Requirements

Common Gate:

Pulse widthPulse amp1 Hude

Input, each channel:

Repetition rateOuty ratIoPulse wldthPulse amplitude

Content

fO.AO... 3 Reads content of Scaler specified by sub-addressGives Q.X

FZ.AO ... 3 Reads and clears the content of the selected ScalerGives Q.X

fB.AO..• 3 Tests LGives Q when LAM from the selected Scaler is set .X

fB.A4 Tests for L from the trailing edge of the Common Gate signalGives Q,X

FIO,A4

FIO.AO.. 3

F9.AO••• 3

Resets L from the trailing edge of the Common Gate signalGives Q* if LAM is set ,X

Resets the LAM from the selected ScalerGives Q* if LAM is set ,X

Resets the selected scalerGives Q.X

F1 .AO Reads content of Status RegisterGivesQ.x

FZ5.AO Increments all four ScalersGives Q.X

F24.A4 Oisables L from tailing edge of the Common Gate signalGives Q,X

FZ6.A4 Enables L from tailing edg~ of the Common Gate signalGives Q.X

* Q can be given either whenever FIO is used or only when L must betested wlth flO, depending on the connection of an internal link.

Readout from the Status Register (F1 .AO)

Read Li ne Logic Level Indication

RI I Scaler I ove rfl ow - LAM setR2 I Scaler Z overflow . LAM setR3 I Scaler 3 overflow - LAM setR4 I Scaler 4 overflow - LAM setRS I Common Gate - LAM setR6 I Scalers I + 2 s e r i a l t zedR7 I Scalers 3 + 4 serial i zedRB I CleH switch set to 'Yes·R9 I '(ommon Gate LAM enabled

SERIAL HIGHWAY CONNECTORS' AUXILIARY CONNECTOR

INPUT OUTPUT(Plug: type OB·25P) (S?cket: type OB-25S) Front View

1. Gnd Gnd e 12- - 23- • 3

4 • } 1__Bit-Serial Bit·Serial I1 {:

4 13 Message In5 - Input Output 5

19 Bit Data In6 -} 2 {:

66 Clock In

7. 2 7 12

8-} 3 {:8 5 18

9- 3 9

10 -}4 {:

10 11

11. 4 11 4 Clock Out 17 Bit Data OutBv te-Serial Byte-Se riat

12 -} Input Output5 {:

12 1013 _ 5 13 3 1614 -} For a logic 1, the odd nurn- 6 {:

1415 _ 6 15 9

bered contact is rnore posi-16 -} tive than the even numbered

7 {:16 2·6 Volts 15 -24 Volts17 _ 7

contact. 17 818_} 8 8 {. 18

1 +6 Volts 14 +24 Volts19 _ Imsb) (rnsb] _ 19

20 - • 20 7 Gnd

~1 - - 21

22 -} Clock. Input Clock Output {- 2223- • 23

24 - Bypass Control Bypass Control _ 24Notas: ± 6 Volts. ± 24 Volts are each fused25 _ (Reserved) Loop-Collapse - 25 at 1 Amp.Control

Mating Connectars Mating connector is Cannon type 20E19S

Input: Cannan type OB-25S with shell, or equivalent or equivalent.

Output: Cannon type OB·25P with shell, or equivalent

SGL-ENCODER CONNECTOR

Contact Signal Direction Contact Signal Direction.

1 Oemand Busy Out 2 L1 Out3 SGLE1 In 4 L2 Out5 SGLE2 In 6 L3 Out7 SGLE3 In 8 L4 Out9 SGLE4 In 10 L5 Out

11 SGLE5 In 12 L6 Out13 External Repeat : In 14 L7 Out15 16 L8 Out17 -- 18 L9 Out19 Time-out Out 20 L10 Out21 Dernand Message Initiate In 22 L11 Out23 Start timer In 24 L12 Out25 Selected L's present In 26 L13 Out27 -- 28 L14 Out29 Auxiliary Controller Lockout Out 30 L15 Out31 Byte Clock Out 32 L16 Out33 -- 34 117 Out35 -- 36 L18 Out37 -- 38 119 Out39 -- 40 L20 Out41 SCC Busy Out 42 L21 Out43 Nl In 44 L22 Out45 N2 In 46 L23 Out47 N4 In 48 L24 ln/Out-49 N8 In 50 L-SUM Out51 N16 In 52 Gnd -

Printed in USA

Maryknoll DriveLockport. lJIinois 60441

8158380005TWX 910 633 2831

SERIAL HIGHWAY CONNECTORS AUXILIARY CONNECTOR

Mating connector: Type 20E19S

Notes: ± 6 Volts, ± 24 Volts are fused for 1 Amp each.

Front View

13 Recvr. Byte Clock

6 Ext Clock 19 Clock In·TTL

12 Msg Traffic In

5 Clock Out 18 Clock In-SH

11 Omd Rcvd Strobe4 Xmtr Byte Clock 17 Oata In-TTL

10CMö3 Bit Oata Out 16 Bit Data In.SH

9SHR·CM52·6 Volts 15 ·24 Volts

8 Transv Par Err1 +6 Volts 14+24 Volts

7 Gnd

Byte·serialOutput

Bit-serialOutput

Bit-seriatInput

OUTPUT(Socket: type OB·255)

,. Gnd Gnd. 1

2 ••-----------------. 23. • 3

::}, ,{: :6.} 2{·. 677. 2

::}3 3{::10.} 4{.'011. 4 11Byte-serial •12.}' Input 5 {. 1213. 5 • 13

~::}6 6{:~:16.} 7{.'617. 7 • 17

18.} S{.'819. 8 • 19

20 ...--------,---------.... 2021 • • 21

22.} Clock Input Clock Output {. 22~..~

24.} Not Used Not Used {. 24~. .~

Mating ConnectorsInput: OB-255 with shellOutput: OB·25P with shell

INPUT(Plug: type OB-25P)

STRAP OPTIONS

Right View of Module (Shield Removed)

WRITE1 248OOQ~

I II II I

0066

REX REX0--0 0 VAR

0 00 40EXT C 3

0---0 0 0 ? 0 0---0 0XTL A 1

68 02

51 52 53

S1 Selects Frequency sourceXTL: 10 MHz crystal oscillatorVAR: 4·12 MHz verlable-frequencv oscillatorEXT: External source

..

READ1 248OOOQ

II

0000..Blnarv-coded numberof space-bytes Ior readend write. Absence ofsrrap « 1. Exampleshows 3 for write and7 for read,

"Operable only with' EXT source

S2 & 53 Select frequency

CI k fSource frequency

oc requency '" M.N

REX Reply space extended by 200 msec_ on write operation to N(30)

REX Reply space not extended

S2MA~ 1B 2C 4o 10

53 N1 12 10

'3 1004 1000