Tektronix 7A18A User manual

ronbc

COMMITTED

EXCELLENCE

PLEASE

CHECK

FOR

CHANGE

INFORMATION

THE

REAR

THIS

MANUAL

7A18A

DUAL

TRACE

AMPLIFIER

INSTRUCTION

MANUAL

Tektronix,

Inc

Box

500

Beaverto$,

Oregon



97077



Serial

Number

070-4329-00



First

Printing

OCT

1982

Product

Group 42



Revised

FEB

1983

1971

1982

Tektronix, Inc

All

rights

reserved

Contents

this

publication

may

not

be reproduced

any

form

without

the

written

permission

Tektronix,

Inc

Products

Tektronix,

Inc

and

its

subsidiaries

are

covered

and

foreign

patents

and/or

pending

patents

TEKTRONIX,

TEK,

SCOPE-MOBILE,

and



are

registered

trademarks

Tektronix,

Inc

TELEQUIPMENT

registered

trademark

Tektronix

Limited

Printed

.S .A

Specification

and

price

change

privileges

are

reserved

INSTRUMENT

SERIAL

NUMBERS

Each

instrument

has a

serial

number

on a

panel

insert,

tag,

stamped

the

chassis

The

first

number

letter

designates

the

country

manufacture

The

last

five

digits

the

serial

number

are

assigned

sequentially

and

are

unique

each

instrument

Those

manufactured

the

United States

have

six

unique

digits

The

country

manufacture

identified

follows

8000000



Tektronix,

Inc

Beaverton,

Oregon,

USA

100000



Tektronix

Guernsey,

Ltd

Channel

Islands

200000



Tektronix

United

Kingdom,

Ltd

London

300000



Sony/Tektronix,

Japan

700000



Tektronix

Holland,

NV, Heerenveen,

The

Netherlands

Section

Section 2

THE

FOLLOWING

SERVICING

INSTRUC-

TIONS

AREFORUSE

QUALIFIED

PER-

SONNEL

ONLY

AVOID

PERSONAL

INJU-

RY,

NOT,

PERFORM

ANY

SERVICING

OTHER

THAN

"HAT

CONTAINED

OPER-

ATING

INSTRUCTIONS

UNLESS

YOU

ARE

QUALIFIED

Section 3

Section 4

TABLE

CONTENTS

CHANGE

INFORMATION

7A18A

Abbreviations

and

symbols

used

this

manual

are

based

taken

directly

from

IEEE

Standards

260

"Standard

Symbols

for

Units",

MIL-STD-12B

and

other

standards

the

electronics

industry

Change

information,

any,

locat-

the

rear of

this

manual

Page

SPECIFICATION

Introduction

.......

......

.....

1-1

Electrical

Characteristics

... .

......

1-1

7A1

and

Mainframe

Frequency

Response

.......

1-1

Environmental

Characteristics

......

1-2

Physical Characteristics

........

1-2

OPERATING

INSTRUCTIONS

Installation

.......

.....

........

2-1

Front

Panel

Controls

and

Connectors

2-1

General Operating

Information

....

2-2

Basic

Applications

...

...........

2-4

CIRCUIT

DESCRIPTION

Introduction

.......

.....

........

3-1

Block

Diagram

Description

. .

......

3-1

Detailed

Circuit

Description

........

3-1

PERFORMANCE

CHECK

ADJUSTMENT

Recalibration

Interval

.....

........

4-1

Test

Equipment

Required

........

4-1

Part

I-Performance

Check

.......

4-4

Part

II-Adjustment

.....

........

4-8

Page

Section

MAINTENANCE

Preventive

Maintenance

.......

...

5-1

Troubleshooting

....

..........

...

5-1

Replacement

Parts

. .........

...

5-3

Component

Replacement

....

...

5-4

Section

6 OPTION

INFORMATION

Section

ELECTRICAL

PARTS

LIST

Abbreviations

and

Symbols

Parts

Ordering

Information

Section 8

DIAGRAMS

AND

CIRCUIT

BOARD

ILLUSTRATIONS

Symbols

and

Reference

Designators

Voltage

and

Waveform

Conditions

Section

MECHANICAL

PARTS

LIST

Mechanical

Parts

List

Information

Index

Mechanical

Parts

Illustrations

Mechanical

Parts

List

Accessories

LIST

ILLUSTRATIONS

Fig



Page

2-1



Front-panel controls

and

connectors



.....



2-1

2-2



Measuring

the

peak-to-peak

voltage



waveform

...... .

.....

........

.....

. .



2-4

2-3



Measuring

instantaneous

voltage

with

respect

some

reference



......

.....

. .



2-5

2-4



Measuring

phase

difference

betwen

two

signals

. ......

.......

........

.....

. .

2-7

2-5



High

resolution

phase

measurment

using

time-base

magnifier

.........

........

. .



2-7

2-6



Using

the

ADD

mode

for

common-mode

rejection

. .

.....

........

.....

........



2-8

3-1



Channel

Input Amplifier

detailed

block

diagram

. .

.....

........

.....

........

3-2



Channel

Input

Amplifier

detailed

block

diagram

...

............

.... .

.........

3-4

3-3



U270

input

combinations

for

DISPLAY

MODE

selection



..... .

.......

........



3-5

3-4



Input/Output

combinations

for

DISPLAY

MODE

and

TRIGGER

SOURCE

switch

selections

........

.....

........

......



3-5

4-1



Locations

adjustments

used

this

procedure

.......

.....

........

.....

4-9

5-1



Electrode

configuration

for

semiconductors

used

this

instrument

..........

.....



5-2

6-1



7A1

Option

.......

........

.....



6-1

6-2



Side

view

7A1

8A-Option

......

. .



6-3



Rear

view

A2-Amplifier

board

for

either

Option

standard

7A1

.....

......



6-3

8-1

and

8-2

are

circuit

board

assemblies

and

are

the

diagrams

section

Terms

This

Manual

OPERATORS

SAFETY

SUMMARY

The

general

safety

information

this

part

the

summa-

for

both

operating

and

servicing

personnel

Specific

warnings

and

cautions

will

found

throughout

the

manual

where

they

apply,

but

may

not

appear

the

summary

CAUTION

statements

identify

conditions

practices

that

could

result

damage

the

equipment

other

property

WARNING

statements

identify

conditions

practices

that

could

result

personal

injury

or loss of

life

Terms

Marked

Equipment

CAUTION

indicates

personal

injury

hazard

not

immedi-

ately

accessible

one

reads

the

marking,

a hazard

property

including

the

equipment

itself

DANGER

indicates

personal

injury

hazard

immediately

accessible

one

reads

the

marking

Symbols

This

Manual

This

symbol

indicates

where

applicable

cautionary

other

information

found

Symbols

Marked

Equipment

DANGER

High

voltage

Protective

ground

(earth)

terminal

Power

Source

ATTENTION

refer

manual

This

product

intended

operate from

power

source

that

will

not

apply

than

250

volts

rms

between

the

7A18A

supply

conductors

between

either

supply

conductor

and

ground

protective

ground

connection

way

the

grounding

conductor

the

power

cord

essential

for

safe

operation

Grounding

the

Product

This

product

grounded

through

the

grounding

conduc-

tor

the

power

cord

avoid

electrical

shock,

plug

the

power

cord

into

properly

wired

receptacle

before

connect-

ing

the

product

input

output

terminals

protective

ground

connection

way

the

grounding conductor

the

power

cord

essential

for

safe

operation

Danger

Arising

From

Loss

Ground

Upon

loss

the

protective-ground connection,

all

acces-

sible

conductive

parts

(including

knobs

and

controls

that

may

appear

insulating)

can

render

electric

shock

UseThe

Proper

Power

Cord

Use

only

the

power

cord

and

connector

specified

for

your

product

Use

only

power

cord

that

is in

good

condition

Refer

cord

and

connector

changes

qualified

service

personnel

Use

The

Proper

Fuse

avoid

fire

hazard,

use

only

the fuse

correct

type,

voltage

rating

and

current

rating

specified

the

parts

list

for

your product

Refer

fuse

replacement

qualified

service

personnel

Not

Operate

Explosive

Atmospheres

avoid

explosion,

not

operate

this

product

explosive

atmosphere

unless

has

been

specifically

certi-

fied

for

such

operation

Not

Service

Alone

SERVICE

SAFETY

SUMMARY

FOR

QUALIFIED

SERVICE

PERSONNEL

ONLY

not

perform

intenal

service

adjustment

of this

prod-

uct

unless another

person capable

rendering

first

aid

and

resuscitation

present

Use

Care

When

Servicing

With

Power

Dangerous

voltages

exist

several

points

this

prod-

uct

avoid

personal

injury,

not touch

exposed

connec-

tions

and

components

while

power

Refer

also

the

preceding

Operators

Safety

Summary

7A18A

Disconnect

power

before

removing

protective

panels,

soldering,

replacing

components

Power

Source

This

product

intended

operate from

power

source

that

will

not apply

than

250

volts

rms

between

the

supply

conductors

between

either

supply

conductor

and

ground

protective

ground

connection

way

the

grounding

coductor

the

power

cord

essential

for

safe

operation

7A18A

Dual

Trace

Amplifier

Introduction

The7A1

Dual

Trace

Amplifier

plug-in unit

designed

for

use

with

TEKTRONIX

7000-Series

Oscilloscopes

The

7A1

dual-channel,

medium-bandwidth

amplifi-

Internal

gain

and

compensation

circuits

are

automatically

switched

correspond

the

setting

the

VOLTS/DIV

SPECIFICATION

Table

1-1

ELECTRICAL

Section

1-7A18A

switch

Channel

can

inverted

for

differential

measure-

ments

The7A1

can

be operated

any

plug-in

compart-

ment

the

7000-Series

Oscilloscopes

The

following

electrical

characteristics

are

valid

over

the

stated

environmental

range

for

instruments

calibrated

ambient temperature

+20°C

+30°C,

and

after

five

minute

warmup

unless

otherwise

noted

Characteristic

PerformanceRequirement

Supplemental

Information

Deflection

Factor

Calibrated

Range

mV/Div

V/Div

;

ten

steps

1,2,5

sequence

Deflection

Factor

Accuracy

Within

with

GAIN

adjusted

mV/Div

Uncalibrated

(VARIABLE)

Continuously

variable

between

calibrated

steps

;

extends

deflection

factor to

least

V/Div

GAIN

Permits

adjustment

deflection

factor

for

calibrated

operation

with

all

7000-series

oscilloscopes

Frequency

ResponseSystem

Dependent

div

reference

signal)

Upper

Bandwidth

(Direct)

MHz

Coupled

Lower

Bandwidth

(Capacitive)

Hertz

less

Coupled

With

10X

Probe

Hertz

less

Maximum

Input

Voltage

Coupled

250

volts,

(DC

Peak

AC)

;

component

500

volts

peak-to-peak

maximum,

one

kilohertz

less

Coupled

500

volts,

(DC

Peak

AC)

;

component

500

volts

peak-to-peak

maximum,

one

kilohertz

less

,hannel

Isolation

display

ratio

megahertz

Specification-7A18A

Performance

Requirements

Approximately

.06 div

less

all

deflection

factors

less

recover

within

one

division

after

the

removal

overdrive

signal

+75

divisions

-75

divisions

regardless

overdrive

signal

duration

least

megahertz

.02

division

or less

any

one

minute,

after

one

hour

warmup

Nor

than

.01

division

perdegree

700

picoseconds

or less

Channel

only

Dual-trace, alternate

between

channels

Added

algebraically

Dual-trace

chopped

between

channels

Channel

only

Channel

only

Follows

DISPLAY

MODE

selection

Channel

only

Characteristics

Input

and

Resistance

Capacitance

Product

Displayed

Noise

(Tangentially

Measured)

Overdrive

Recovery

Time

Common

Mode

Rejection

Ratio

Drift

with

Time

(Ambient

temperature

and

line

voltage

constant)

Size

Drift

with

Temperature

(line

voltage

constant)

Time

Delay

between

Channels

Display

Modes

Trigger

source

Selection

Refer

the

Specification

for

the

associated

oscilloscope

Weight

Table

1-1 (cont)

Table

1-2

ENVIRONMENTAL

CHARACTERISTIC

Table

1-3

PHYSICAL

Fits

all

7000-series

plug-in

compartments

:e2

Pounds

Ounces

(

kilograms)

Supplemental

Information

Within

between

all

deflection

factors

General

Installation

OPERATIN

effectively

use

the

7A1

BA,

the

operation

and

capabili-

ties

the

instrument

must

known

This

section

de-

scribes

front-panel control

functions,

general

information

signal

input

connections,

and

other

subjects

that

pertain

various

measurement

applications

The

7A1

calibrated

and

ready

for

use as

received

can

installed

any

compartment

Tektronix

7000-Se-

ries

oscilloscopes,

but

intended

for

principal

use

vertical

plug-in

compartments

install,

align

the

upper

and

lower

rails

the

7A18A

with

the

oscilloscope

tracks

and

fully

in-

sert

The

front

will

flush

with

the

front

the

oscillo-

scope

when

the

7A1

fully

inserted,

and

the

latch

the

bottom-left

corner

the

7A1

will

place

against

the

front

panel

remove

the

7A1

8A,

pull

the

latch

(which

in-

scribed

with

the

unit

identification

"7A18A")

and

the

7A18A

will

unlatch

Continue

pulling

the

latch

slide

the

7A1

out

the

oscillscope

FRONT

PANEL

CONTROLS

AND

CONNECTORS

The

following

descriptions

apply

the

controls

and

con-

nectors

both

Input

Amplifier

channels

when

applicable

See

Fig

2-1

Input

Connector



Provides

signal

connection

the

channel

AC-GND-AC



Selects

signal

input

coupling

mode

INSTRUCTIONS

AC-The

component

the

sig-

nal

coupled

the

amplifier

in-

put

while

the

component

blocked



POSITION

GND-Grounds

the

amplifier

input

while

maintaining

the

same

load

for

the

input

signal

Provides

charge

path

for

the

coupling



IDENTIFY

capacitor

precharge

the

input

circuit

before switching the

input

Section

2-7A18A

4329-07

Fig

2-1

Front-panel

controls

and

connectors

(7A18A

shown

DC-Both

and

components

the

signal

are coupled

the

amplifier

input

Controls

position

the

trace

Posi-

tioning

the

trace

the

"ADD"

Display

Mode

controlled

POSITION

control

only

Deflects

trace

about 0

division

for

trace

identification

instruments

with

readout, also

replaces

readout

with

the

word

"IDENTIFY"

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