Tektronix 7A12 User manual

GTI

MAN

VAL

Serial



Number

)

'~Cr

DUAL

TRACE

AMPLIFIER

Tektronix,

Inc

Box

500

Beaverton,

Oregon97005 "

Phone

644-0161

Cables

Tektronix

070-0977-01



971

WARRANTY

All

Tektronix

instruments

are

warranted

against

defective materials

and

workmanship

for

one

year

Any

questions

with

respect

to the

warranty,

mentioned

above,

should

taken

with your

Tektronix

Field

Engineer

representative

All

requests

for

repairs

and

replacement

parts

should

he directed

the

Tektronix

Field

Office or

representative

your

area

This

procedure

will

assure

you

the

fastest

possible

service

Please

include

the

instrument

Type

(or

Part

Number)

and

Serial

Model

Number

with

all

requests

for

parts

service

Specifications

and

price

change

privileges

reserved

1971 by

Tektronix,

Inc

Beaverton,

Oregon

Printed

the

United

States of

America

All

rights

reserved

Contents

this

publication

may

not

be reproduced

any

form

without

permission

the

owner

and

foreign

Tektronix

products

covered

by U

and

foreign

patents

and/or

patents

pending

TABLE

CONTENTS

7A12

SECTION

SPECIFICATION

Page

SECTION

CALIBRATION

Page

Introduction

1-1

Introduction

5-1

Electrical

Characteristics

1-1

Test

Equipment

Required

5-1

Environmental

Characteristics

1-3

Performance

Check

5-3

Physical

Characteristics

1-3

Adjustment

5-7

SECTION2

OPERATING

INSTRUCTIONS

General

2-1

SECTION

ELECTRICAL

PARTS

LIST

Front

Panel

Controls

and

Connectors

2-1

Abbreviations

and

Symbols

General

Operating

Information

2-3

Parts

Ordering Information

Basic

Applications

2-5

Index

Electrical

Parts

List

SECTION

CIRCUIT

DESCRIPTION

Introduction

3-1

SECTION

DIAGRAMS

AND

CIRCUIT

BOARD

Block

Diagram

3-1

ILLUSTRATIONS

Detailed

Circuit

Description

3-1

SECTION

MAINTENANCE

SECTION

MECHANICAL

PARTS

LIST

Introduction

Mechanical

Parts

List

Information

Preventive

Maintenance

Index of

Mechanical

Parts

Illustrations

Troubleshooting

Mechanical

Parts

List

Corrective

Maintenance

Accessories

Fig

1-1

7A12

Dual

Trace

Amplifier

Introduction

The

7A12

vertical

amplifier

plug-in

designed

for use

with

Tektronix

7000-Series

Oscilloscopes

The

7A12

dual-channel,

wide

band

amplifier

with

the

upper

frequency

limit

mainly

determined

the

oscilloscope

mainframe

which

it is

used

For

example,

the

7A12

used with

the

7504

oscilloscope

will

have

upper

bandwidth

limit

about

MHz

When

used with

7704

oscilloscope,

the

upper band-

width

limit

about

105

MHz

. .

Internal

gain

and

compen-

sation

circuits

are

auotmatically

switched

correspond

the

setting

the

VOLTS/DIV

switch

+UP/INV

switch

for

each

channel

allows

either

channel

inverted

for

differential

measurements

The

7A12

features

offset

circuit

with

offset

at least

±500

divisions

for

SECTION

SPECIFICATION

TABLE

1-1

ELECTRICAL

7A12

viewing

low

level

signals

the

presence

high-level

component

This

instrument

will

meet

the

electrical

characteristics

listed

Table

1-1

following

complete

calibration

given

Section

The

performance

check procedure

given

Section

provides

convenient

method

checking

instru-

ment

performance

withoutmaking

internal

adjustments

The

following

electrical

characteristics

are

valid

over

the

stated

environmental

range

for

instruments

calibrated

ambient

temperature

+20

+30

after

five

minute

warmup

unless

otherwise

stated

Characteristic

Performance

Requirement

Supplemental

Information

Deflection

Factor

Calibrated

Range

mV/div

V/div,

pushbuttons

sequence

Deflection

Factor

Within

with

GAIN

adjustment

Accuracy

mV/div

Uncalibrated

Continuously

variable

;

VAR

V/DIV

extends

deflection factor

least

V/div

+UP

INVERT

Gain

Ratio

within

Frequency

Response See Table

(Capacitive)

less

without

probe,

less

Coupled

Input

Lower

with

P6053

Bandwidth

Frequency

Time

Delay

Between

Channels

500

ps or

less

Channel

Isolation

least

3000

div

with

div

reference

signal

MHz

least

100

with

equal

deflection

factors

MHz

less

Specification-7A12

TABLE

1-1

(cont)

Characteristic

Performance

Requirement

Supplemental

Information

Maximum

Input

Voltage

Direct

Couple

mV/div

350

Peak

kHz

mV/div

less

mV/div

500

Peak

kHz

V/div

less

(Capacitive)

Coupled

Input

mV/div

350

Peak

kHz

mV/div

less

mV/div

V/div

500

Peak

Input

and

Resistance

Megohm

±2%

Capacitance

Approximately

and

Product

Within

±1%

between

all

deflection

factors

Recommended

X10

Probe

P6053,

6ft

Maximum

Input

Gate

+35

Current

+50

IDENTIFY

Trace

deflects

div

Display

Noise

250

mV/div

div

less

(Tangentially

Measured)

other

deflection

factors

Chopped

Mode

(when

installed

in vertical

compartment

Mainframe

dependent

Repetition

Rate

500kHz

within

20%

Channel

Time

Segment

ps to

Drift

With

Ambient

100

pV/

.01

div/

whichever

Temperature

(Line

greater

Voltage

Constant)

OFFSET

Range

least

+1000

div

-1000

div

mV/div

least

+500

div

-500

div

from

mV/div

V/div

Common

Mode

Rejection

Ratio

least

MHz

less

scope

TABLE

7A12

AND

MAINFRAME

FREQUENCY

RESPONSE

(five

division reference)

With

7900

Series



With

7700

Series



With

7500

Series



With

7400

Series

120

MHz



105

MHz



MHz



MHz

TABLE

1-2



TABLE

1-3

ENVIRONMENTAL



PHYSICAL

Specification-7A12

Refer



the



Specification



for

the



associated



oscillo-



Size



Fits

all

7000-Series

Plug-in

Compartments

Weight



Ibs

kg)

General

SECTION

OPERATING

INSTRUCTIONS

effectively

use the

7A12,

the

operation

and

capa-

bilities

the

instrument

must

know

This

section

de-

scribes

front-panel

control

functions,

general

information

signal

input

connections,

and

other

subjects

that

pertain

various

measurement

applications

Installation

The

7A12

calibrated

and

ready

for use

received

can

installed

any

compartment

Tektronix

7000-

Series

Oscilloscopes,

but

intended

for

principal

use

vertical

plug-in

compartments

install,

align

the

upper

and lower

rails

the

7A12

with

the

oscilloscope

tracks

and

insert

The

front

panel

will

flush

with

the

front

the

oscilloscope

when

the

7A12

fully

inserted,

and

the

latch

the

bottom-left

corner

the

7A12

will

place

against

the

front panel

remove

the

7A12,

pull

on the

latch

(which

in-

scribed

with

the

unit

indentification

"7A12")

and

the

7A12

will

unlatch

Continue

pulling

the

latch

slide

the

7A12

out

the

oscilloscope

FRONT

PANEL

CONTROLS

AND

CONNECTORS

The

following

descriptions

apply

the

controls

and

connectors

both

Input

Amplifier

channels

when

appli-

cable

See

Fig

2-1

Input

Connector



Provides

signal

connection

the

channel

AC-GND-DC-



Four

position

pushbutton

switch

OFFSET



selects

signal

input

coupling

mode

AC-The

component

the

signal

coupled

the

amplifier

input while

the

component

blocked

DC-Both

and

components

the

signal

are

coupled

the

amplifier

input

POSITION

IDENTIFY

VOLTS/D

Pushbuttons

VAR

V/DIV

+UP/INV

Pushbuttons

7A12

GND-Grounds

the

amplifier

input

while

maintaining

the

same

load

for the

input

signal

Provides

charge

path

for the

coupling

capacitor

precharge

the

input

circuit

before

switching

the

input

OFFSET-Direct

couples

the

signal

the

amplifier

and

pro-

vides

offset

at least

500

divisions

(±

1000

divisions

mV/Div)

Controls

vertical

position of

the

trace

Deflects

trace

about

div

for

trace

identification

Also

replaces

readout

with

the

word

"IDENTIFY"

when

used

with

oscilloscopes

equipped

with

read-

out

system

Volts

per

major

graticule

division

Selects

calibrated

deflection

factors

from

mV/Div

V/Div

;

steps

1-2-5

sequence

Provides

continuously

variable

un-

calibrated

deflection factor

settings

between

calibrated steps

Extends

deflection factor

range

at least

volts/division

Provides

means

inverting

the

display

+UP-A

positive-going

signal at

the

input

deflects

the

CRT

display

upward

INV-A

positive-going

signal at

the

input

deflects

the

CRT

display

downward

Operating

Instructions-7A12

nld

rwmDe

x0n

Fig

2-1

.Front-Panel Controls

=uConnectors

OFFSET

TRIGGER

SOURCE

Pushbuttons

Variable

control permits

on-screen

display

small

signal

variations

superimposed

upon

relatively

large

levels

DISPLAY

MODE



Pushbutton



selection



the

Pushbuttons



following

modes

operation

1-A

single

trace

display

the

signal

applied

Channel

input

connector

ALT-A

dual

trace

display

the

signals

applied

both

channels

The

channels

are

alternately

dis-

played

and

switching occurs

the

end

each

sweep

ADD-Algebraically

adds

the

signals

applied

the

and

input

connectors

and

the

algebraic

sum

displayed

the

CRT

CHOP-A

dual

trace

display

the

signal

applied

both

channels

The

two

channels

time-share

the

sweep

rate

determined by

the

main-

frame

output

signal

provided

for

trace

blanking

during the

channel

switching

interval

Selects

source

trigger

signal

The

trigger signals

provide

internal

trig-

gering

for

the

oscilloscope

time-

base

1-Internal

triggering

signal

ob-

tained

from

signal

applied

Channel

Input

connector

Mode-(Center

pushbutton)

in-

ternal

trigger

automatically follows

DISPLAY

MODE

selection

ADD

CHOP

display

modes,

the

trigger

signal

the

algebraic

sum

and

trigger

2-Internal

trigger

signal

ob-

tained

from

signal

applied

Channel

Input

connector

Operating

Instructions-7A12

GENERAL

OPERATINGINFORMATION

Introduction

For

single

trace

operation,

either

the

two

identical

amplifier

channels

can

used

independently

setting

the

DISPLAY

MODE

and

TRIGGER

SOURCE

switches to

and

connecting

the

signal

observed

the

appropriate

input

the

discussions

follow,

single-trace

operation

using

applies

equally

Signal

Connections

general

probes

offer

the

most

convenient

means

connecting

signal

the

input

the

7A12

X10

atten-

uator

probe

offers

high

input

impedance

and

allows

the

circuit

under

test

perform

very

operating

con-

ditions

The

Tektronix

P6053

foot

probe,

with

its

readout-coding

ring,

designed

specifically

for use

with

the

Tektronix

series vertical

amplifiers

The

readout coding

ring

the

probe

connects

circuit

the

7A12

which

automatically

corrects

the

readout

displayed

the

CRT

the

actual

deflection

factor

the

tip

the probe

The

Tektronix

P6053

foot

probe

not

recommended

be-

cause

may

compromise

the

aberration

limits

this

am-

plifier

Vertical

GainAdjustment

check

the

gain of

either

channel,

set

the

VOLTS/D

switch

and

connect

mV,

kHz

signal

from

the

oscilloscope

calibrator

the

Input

connector of

the

channel

being

checked

The

vertical

deflection

should

exactly

four

divisions

not, adjust

the

front-panel

GAIN

for

exactly

four

divisions

deflection

Both

channels

should

checked

and

adjusted,

necessary,

before

making measurements

the

gain

the

two

channels

must

closely

matched

(as

differential

measurements

using

the

ADD

MODE),

use

the

adjustment

procedure

Section

Input

Coupling

NOTE

The

Channel

and Channel 2

Input

Coupling

switches

allow

choice

input

coupling

methods

The

type

display

desired

and the

applied

signal will

determine

the

coupling

use

The

coupling

position

can be

used

for

most

appli-

cations

must

used

display

signals

below

about

hertz

(10

hertz

with

X10

probe)

and

squarewaves

with

low

frequency

components,

these

signals

will

atten-

uated

the

position

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