Tektronix 7D12 Manuale utente

TEKTRONIX

7o7z

A/D

CONVERTER

SERVICE

INSTRUCTION

MANUAL

Tektronix,

Inc

P.O

Box

500

Beaverton,

Oregon

97005



Serial

Number

070-1470-00



First

Printing

JUNE

1974

WARRANTY

All

TEKTRONIX

instruments

are

warranted

againsr

defective materials

and

workmanship

for

one

year

Any

questions

with

respect

the

warrantyshould

betaken

with

yourTEKTRONIX

Field

Engineeror

representative

All

requests

for

repairs

and

replacement

parts

shouldbe

directed

the

TEKTRONIX

Field Office

representative

your

area

This

will

assure

you

the

fastest

possible

service

Please

include

the

instrument

Type

Number

or Part

Number

and

Serial

Number

with

all

requests

for parts or

service

Specifications

and

price

change

privileges

reserved



1974

Tektronix,

Inc

Beaverton,

Oregon

Printed

the

United

States

America

All

rights

reserved

Contents

this

publication

may

not

reproduced

any

form'

without

permission

Tektronix,

Inc

and

foreign

TEKTRONIX

products

covered

and

foreign

patents

and/or

patents

pending

TEKTRONIX

registered

trademark

Tektronix

Inc

TABLE

CONTENTS

71312

Service

TABLE

CONTENTS

Page

SECTION

MAINTENANCE

Page

LIST

ILLUSTRATIONS

PREVENTIVE

MAINTENANCE

3-1

LIST

OFTABLES

Introduction

3-1

Cleaning

3-1

SECTION

OPERATING

INFORMATION

Visual

Inspection

3-1

PRELIMINARY

INFORMATION

1-1

Recalibration

3-1

71312

Features

1-1

TROUBLESHOOTING

3-2

Display

Modes

1-2

Troubleshooting

Aids 3-2

71312

Installation

1-2

Troubleshooting

Equipment

3-2

Module

Installation

1-2

Troubleshooting

Procedure

3-2

CORRECTIVE

MAINTENANCE

3-4

SECTION

THEORY

OPERATION

General

3-4

Obtaining

Replacement

Parts

3-4

PRELIMINARY

INFORMATION

2-1

Soldering

Techniques

3-4

BLOCK

DIAGRAM

2-1

Component

Replacement

3-5

Block

Diagram

Description

2-1

Circuit

Board

Replacement

3-6

LOGIC

TRIGGERING

2-2

Switch

Replacement

3-7

4-1/2

DIGIT

A/D

CONVERTER

AND

LOGIC

2-3

SECTION

PERFORMANCE

CHECK/CALIBRATION

READOUT

LOGIC

2-5

THE

TEKTRONIX

READOUT

PRELIMINARY

INFORMATION

4-1

SYSTEM

2-8

Calibration

Interval

4-1

INVERTER

POWER

SUPPLY

2-10

Tektronix

Field

Service

4-1

DUAL-TRACE

VERTICAL

Using

This

Procedure

4-1

AMPLIFIER

2-11

Test

Equipment

Required

4-1

CIRCUIT

OPERATION

2-11

PART

1-PERFORMANCE

CHECK

4-5

VERTICAL

AMPLIFIER1O

2-12

Index

Part

1-Performance

4-1/2

DIGIT

A/D

CONVERTER<

2-13

Check

4-5

LOGIC

2-13

Preliminary

Procedure

for

POWER

AND

CONNECTORS

2-14

Performance

Check

4-5

71312

Service

Page

TABLE

CONTENTS

(cont)

LIST

ILLUSTRATIONS

Figure

Page

Figure

Page

Number Number

2-4B

Block

diagram

the

1-1

Frontispiece

4-1/2

Digit

A/D

Converter

(cont

2-7

1-2

71312

Front-panel

control

2-5

Block

diagram

the

and

connector

functions

1-1

Readout

Logic

section

2-9

1-3

Display

mode

switch 2-6

Block

diagram

the

location

and

functions

1-2

Inverter

Power

Supply

2-10

1-4

71312

and

module

installation

1-2

2-7

Block

diagram

the

Dual-Trace

2-1

Block

diagram

module

and

Vertical

Amplifier

section

2-11

71312

A/D

Converter

2-1

4-1

71312

Calibration Fixture

installed

4-5

2-2

Block

diagram

the Logic 4-2

Typical

Inverter

pulse

waveform

Triggering

section

2-2

properly

neutralized

4-11

2-3

Timing

diagram

the

4-3

Typical

time-slot

pulses

with

4-1/2

Digit

A/D

Converter

2-4

relation

the

readout

display

4-17

2-4A

Block

diagram

the

4-4

Typical

example

gate

4-1/2

Digit

A/D

Converter

2-6 pulse

neutralization

4-19

SECTION

PERFORMANCE

CHECK/CALIBRATION

SECTION

ELECTRICAL

PARTS

LIST

(cont)

VERTICAL

DISPLAY

4-6

VOLTAGE

READOUT

DISPLAY

AND

TRIGGERING

4-7

GATE

DISPLAY

4-8

SECTION

DIAGRAMS

AND

CIRCUIT

BOARD

PART

II-CALIBRATION

ILLUSTRATIONS

PROCEDURE

4-9

Index

Calibration

Procedure

4-9

Preliminary

ProcedureFor

Calibration

4-9

SECTION

MECHANICAL

PARTS

LIST

FLOATING

POWER

SUPPLY

4-10

VERTICAL

DISPLAY

4-12

BANDWIDTH

4-14

ANALOGTO

DIGITAL

CONVERTER

4-16

CHANGE

INFORMATION

LIST

ILLUSTRATIONS

(cont

MECHANICAL

PARTS

LIST

ILLUSTRATIONS

Figure

Number



Exploded

view

2,3



Accessories

and

Repackaging

Dimensions

LIST

TABLES

Table



Page

Number

2-1



7D12

Readout

Format



2-8

2-2



U148

Input/Output

Table

for

and

2 Display

Modes

2-12

3-1



Fuse

Ratings



3-7

4-1



Test

Equipment



4-2



Vertical

Display

Amplitude

and

Lower

Numerical

Readout



4-6

4-3



Floating

Power

Supply

Limits



4-10

4-4



Vertical

Display

Amplitude

and

Lower

Numerical

Readout



4-13

7D12

Service

Figure

Number

Figure

Number

6-1

Semiconductor

lead

configurations

6-5

(A3)

Triggering

switch

board

Component

locations

Block

Diagram

Logic

6-2

(A1)

Mainboard

component

locations

Vertical

6-6

(A2)

Floating

board

component

locations

Amplifier

Power

and

Connectors

6-3

A2)

Floating

board

component

locations

6-7

(A1)

Main

circuit

board

adjustment

locations

4-1/2

Digit

A/D

Converter

6-8

(A2)

Floating

circuit

board

6-4

(A1)

Mainboard

component

locations

adjustment

locations

Fig

1-1

7D12

A/D

Converter

with

Multi-function

Module

partially

installed,

Sample/Hold

Module,

and

RMS

Volts

Module

7D12

Service

PRELIMINARY

INFORMATION

7D12

FEATURES

The

7D12

an analog

digital

converter

for

use

with

any

7000-series

oscilloscope

mainframe

that

contains

readout

Several

plug-in

modules

are

available

for

use

with

the

7D12

Depending

upon

the

plug-in

module

used,

the

7D12

can

supply

4-1/2

digit

display

with

full

scale

reading

20000

the

mainframe

crt

When

not

used,

the

most

significant

digit

the

display

suppresed

Automatic

polarity

and

overflow

indicators

are

also

VERTICAL

DISPLAY

POSITION

Control

Positions

the

signal

display

verti-

cally

the

crt

when

used

the

vertical

plug-in

compartment

the

mainframe

ATTENUATOR

Switch

Controls

signal

amplitude,

and

sets

the

first

significant

readout

figure

GATE

POSITION

Control

Positions

the

gate

display

verti-

cally

the

mainframe

crt

GATE

ON-OFF

Pushbutton

Allows

the

digital

gate

dis-

played

the

mainframe

crt

the

locked

position

(see speci-

fic

module

operating

instructions

for

applications)

OPERATING

INFORMATION

Fig

1-2

7113112

Front-panel

control

and

connector

functions

Section

1-7D12

Service

contained

the

7D12

The

A/D

Converter

can

triggered

internally

by the

plug-in

module,

manually

by a

front-panel switch,

externally

from a

trigger

source

such

as the

7D15

Period

Timer

The

7D12

also

contains a

vertical

display

amplifier

that

displays

the

signal

applied

the

module,

and

gate

display

amplifier

that

displays

representation

the

7D12

internal

gate

signal

Since

the

7D12

function

dictated

the

module

installed,

instructions

for

operating

the

7D12

are

located

the

Operating

Instructions

for

each

module

M1,

M3)

brief

description

the

7D12

Front-Panel

Controls

and

Connectors

shown

Fig

1-2

TRIG'D

Indicator

Indicates

the

period of

time

the

A/D

converter

busy

AUTO

Mode

Pushbutton

Connects

internal

triggering

signal

Automatic

recycling

nominally

set

measurements

per

second

EXT

Mode

Pushbutton

Accepts

triggering

signal

connec-

ted to

the

EXT

connector

manual

operation

EXT

Connector

Provides

means

connecting

external

trigger

signal

the

trigger

amplifier

while

the

EXT

mode

MAN

Mode

Pushbutton

Allows

manual

triggering

push-

ing

the

MAN

button

1470-2

Operating

Information-7D12

Service

DISPLAY

MODES

The

vertical

display

and

the

internal

gate

display

can

operated

either

alternate

chop

mode,

depending

upon

the

'internal

Display

Mode

switch

setting

;

see

Fig

1-3

Display

mode

switch Location

and

functions

Alternate

Mode

The

Alt

position

(toward

front

panel)

the Display

Mode

switch

produces

display

that

alternates

between

the

vertical

display

and

the

gate

display

with

each

sweep

the

crt

Although

the

Alt

mode

can

used

atall

sweep

rates,

the

Chopmode

provides

satisfactory

display

sweep

rates

belowabout0

millisecond perdivision

slow

sweep

rates,

alternate

mode

switching

becomes

visually

perceptible

Chop

Mode

The

Chop

position

(toward

rear)

the

Display

Mode

switch

produces

display

that

electronically

switched

between

the

input

display

and

the

trigger

gate

display

approximately

500

kilohertz

rate

(controlled

main-

frame)

general,

the

Chop

mode

provides

the

best

display

sweep

rates

slower than

about

millisecond

per

division

7D12

INSTALLATION

CAUTION

Extreme

care

should

exercised

when

handling

the

7D12

prevent

touching

any

part

the

circuit

boards

This

unit

contains

several

high

impedance

circuits

which

can

develop

inter-leakage

con-

taminated

body

salts

acids

Refer

the

Maintenance

Section

this

manual

for

recommended

cleaning

methods

and

solvents

The

7D12

calibrated

and

ready

for

use

with

module

received

can

installed

any

compartment

Tektronix

7000-series

oscilloscopes,

but

intended

prin-

cipally

for

use

vertical

plug-in

compartments

install,

align

the

upper

and

lower

rails

the

7D12

with

the

oscilloscope

tracks

and

fully

insert

The

front

flush

with

the

front

the

oscilloscope

when

the

7D12

fully

inserted,

and

the

latch

the

bottom-left

corner

the

7D12

will

place

against

the

front

panel

See

Fig

1-4

Set

the

oscilloscope

for

vertical

mode

correspond

with

the

vertical

compartment

used

when

analog

signal

displayed

The

digital

readout

will

displayed

regardless

the

vertical

mode

selected

To remove

the

7D12,

pull

the

latch

(which

inscribed

with

the

unit

identification

"7D12")

and

the

7D12

will

unlatch

Continue

pulling

the

latch

slide

the

7D12

out

the

oscilloscope

MODULE

INSTALLATION

All

modules

are

calibrated

and

ready

for

use

with

the

7D12

received

install,

align

the

upper

and

lower

rails

of the

module

with

the

7D12

module-compartment

tracks

and

fully

insert

The

front

flush

with

the

front

the

7D12 when

the

module

fully

inserted

Lock

the

module

securely

position

rotating

the

retaining

knob

clockwise

until

finger-tight

See

Fig

1-4

remove

the

module,

reverse

the

above

procedure

Fig

1-4

7D12

and

module

installation

INTRODUCTION

THEORY

OPERATION

PRELIMINARY

INFORMATION

This

section

the

manual

describes

the

circuitry

used

the

71312

A/D

Converter

The

description

begins

with

discussion

the

instrument,

using the

basic

block

diagram

shown

Fig

2-1

Next,

each

major

circuit

described

detail,

using

detailed

block

diagrams

show

the

relationship

between

stages

each

major

circuit

Detailed

schematics

each

circuit

are

located

the

Diagrams

Section

the

back

this

manual

;

refer

these

schematics throughout

the

following

circuit

description

for

specific

electrical

values

and

relationships

BLOCK

DIAGRAM

DESCRIPTION

INPUT

SCALEFACTOR,

MEASUREMENT

UNIT,

DECIMAL

POINT,

LAST

DIGIT

SUPPRESSION

71312

A/D

CONVERTER

OSCILLOSCOPE

CHARACTER

GENERATOR

SIGNALTO

OSCILLOSCOPE

VERTICAL

1470-5

Fig

2-1

Block

diagram

moduleand

71312

A/D

Converter

BLOCK

DIAGRAM

Section

2-71312

Service

The

function

each

block

the

basic

block

diagram,

Fig

2-1,

readily

apparent

except

for

the Inverter

Power

Supply

This supply

permits

floating

the

A/D

Converter

section,

enabling

measurements

with

the

inputs

elevated

ashighas

Further,

not

all

modules

utilize

the

Display

and

Gate

amplifier

circuits

shown

Each

block

represents

major

circuit

within

the

instrument

The

numbered

diamond

each

block

refers

the

circuit

diagram,

(located

the

back

this

manual)

which

covers

that

specific part of

the

instrument

Theory

Operation-7D12

Service

The

7D12

A/D

Converter

plug-in

unit

contains a

fast, 4-

1/2

digit

analog-to-digital

converter,

Inverter

Power

Supply,

Dual-Trace

Vertical

Amplifier,

Readout

Logic

and

Trigger

Logic

circuit

The

modules

process

various

analog

signals,

such

peak

voltage,

rms

voltage,

resistance,

temperature,

etc

and

produce

voltage

which

the

7D12

converts

digital

readout

information

for

the

7000-series

oscilloscope

The

modules

also

provide

analog

signal

for

display

the

crt

INTRODUCTION

2-2

LOGIC

TRIGGERING

The

block

diagram

for

the

Logic

Triggering

circuitry

shown

Fig

2-2

The

trigger

signal

connected

internally

from

the

7D12

A/D

Converter

the

module

The

and

modules

return

the

trigger

signal

directly

the

7D12

A/D

Converter

as an

A/D

Convert

Command

The

module,

however,

holds the

trigger

signal

until

the

sampling

process

complete

before

releasing

A/D

Convert

Command

TRIGGERING

SWITCH

Auto

Mode

AND

DIRECT

INTERNAL

CONNECTION

MODULE

LOGIC

TRIGGER

SIGNAL

L__A/D

CONVERT

b7 k

COMMAND

7D12

A/D

CONVERTER

S424

TRIGGERING

MULTIVIBRATOR

U440A,Q434

U436A

MAN

A/D

BUSY

MONOSTABLE

MULTI,

U440B

TRIG'D

R438

SINGLE

B15

SWEEP

RESET

A22 A/D

BUSY

1470-6

Fig

2-2

Block

diagram

the

Logic

Triggering

section

Free-Run

Oscillator

Q610

connected

the

trigger

source

The

oscillatorhasa

nominal

output

frequencyof4

hertz

External

Mode

The

Free-Run

Oscillator

and

volt

sources

are

disconnected

External

trigger

signals

connected

the

7D12

EXT

connector

are

used

directly

the

trigger

source

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