Tektronix 7A18 User manual

Tektronix,

Inc

Box

500

Beaverton,

Oregon

97005

Phone

644-0161

Cables

Tektronix

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1974,

Tektronix,

117 -

"eaverion,

Oregon

Printed

the

United

States

America

All

rights

reserved

Contents

this

publication

n)ay

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without

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ektronix,

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OPTION

INFORMATION

REV

JUNE

1974

CHANGE

INFORMATION

7A18/7A18N

Abbreviations

and

symbols

used

in this

manual

are

based on

taken

directly

from

IEEE

Standard

260

"Standard

Symbols

for

Units",

MIL-STD-12B

and

other

standards

the

electronics

industry

Change

information,

any,

located

the

rear

this

manual

SECTION

SPECIFICATION

Page

Introduction

1-1

Electrical

Characteristics

1-1

7A18

And

Mainframe Frequency

Response

1-3

Environmental

Characteristics

1-3

Physical

Characteristics

1-3

SECTION

OPERATING

INSTRUCTIONS

Installation

2-1

Front

Panel

Controls

and Connectors

2-1

General

Operating

Information

2-2

Basic

Applications 2-4

SECTION

CIRCUIT

DESCRIPTION

Introduction

3-1

Block

Diagram

Description

3-1

Detailed

Circuit

Description

3-1

SECTION4

MAINTENANCE

Preventive

Maintenance

4-1

Troubleshooting

4-1

Replacement

Parts

4-3

Component

Replacement

4-4

SECTION

CALIBRATION

Recalibration

Interval

5-1

Test

Equipment

Required

5-1

Part

Performance

Check

5-3

Part

Adjustment

5-7

SECTION

ELECTRICAL

PARTS

LIST

Abbreviations

and

Symbols

Parts

Ordering

Information

SECTION

DIAGRAMS

AND

CIRCUIT

BOARD

ILLUSTRATIONS

Symbols

and

Reference

Designators

Voltage

and

Waveform

Conditions

SECTION8

MECHANICAL

PAR'I'S

LIST

Mechanical

Parts

List

Information

Index

Mechanical

Parts

Illustrations

Mechanical

Parts

List

Accessories

7A18/7A18N

Fig

1-1

7A18

and

7A18N

Amplifier

Introduction

The

7A18

and

7A18N

Dual

Trace

Amplifier

plug-in

units

are

designed

for use

with

Tektronix

7000-Series

Oscilloscopes

The

7A18

and

7A18N

are

electrically

iden-

tical

except

that

readout

encoding

capabilities

and

"IDENTIFY"

function

are

provided only

the

7A18

All

references

made

to the

7A18

apply

equally to the

7A18N

unless

otherwise noted

The

7A18

dual-channel,

medium-bandwidth

amplifier

Internal

gain

and

compensa-

tion

circuits

are

automatically

switched

correspond

Deflection

Factor

GAIN

Deflection

Factor

Accuracy

Characteristic

Calibrated

Range

Uncalibrated

(VARIABLE)

Frequency

Response

System

Dependent

div

reference

signal)

Upper

Bandwidth

(Direct)

Coupled

Lower

Bandwidth

(Capacitive)

Coupled

With

10X

Probe

Change

information,

any,

affecting

this

section

will

found

at the

rear

the

manual

Performance

Requirement

mV/Div

V/Div

;

ten

steps

in a

sequence

Within

with

GAIN

adjusted

. .

._ ._

. .

.__

._ .

Continuously

variable

between

calibrated

steps

;

extends

deflection

factor

least

V/Div

See

Table

Hertz

less

Hertz

less

TABLE

1-1

ELECTRICAL

the

setting

of the

VOLTS/DIV

switch

Channel

can

inverted

for differential

measurements

The

7A18

can

operated

any

plug-in

compartment

of the

7000-Series

Oscilloscopes

The

following

electrical

characteristics

are

valid

over the

stated

environmental

range

for

instruments

calibrated

ambient

temperature

+20

+30

and

after

five

minute

warmup

unless

otherwise

noted,

series

oscilloscopes

7A18/7A18N

Permits

adjustment

of deflection

factor

for

calibrated

operation

with

all

7000-

Specification-7A18/7A18N

TABLE

1-1

(cont)

Characteristic

Maximum

InputVoltage

Coupled

Channel

Isolation

Input

and

Resistance

Capacitance

Product

Displayed Noise

(Tangentially

Measured)

Overdrive

Recovery

Time

Common

Mode

Rejection

Drift

Display

Modes

Drift

with

Time

(ambient

temperature

and

line

voltage

constant)

Drift

with

Temperature

(line

voltage constant)

Time

Delay

between

Channels

Performance

Requirement

display

ratio

megahertz

MQ±2%~

Approximately

least

megahertz

Channel

only

Dual-trace, alternate

between

channels

Added

algebraically

Dual-trace

chopped

between

channels

Channel

only

Supplemental,

Information

250

volts,

(DC+

Peak

AC)

;

com-

ponent500

volts

peak-to-peak

maxi-

mum,

one

kilohertz

less

500

volts,

(DC

Peak

AC)

;

compo-

nent

500

volts

peak-to-peak

maxi-

mum,

one

kilohertz

less

Within

:,_

between

all

deflection

factors

300

microvolts

less

mV/Div

7000-Series

Oscilloscope

less

recover

within

one

division

after

the

removal

of an over-

drive

signal

+75

divisions

---75

divisions

regardless

overdrive

signal

duration

0.02

division

less in

anyone

minute,

after

one

hour

warmup

than

.01

division

per

degree

700

picoseconds

less

Cha,~~o,puo

Trigger

source

Selection

Size

Weight

With

7700

SeHes

MHz

Performance

Requirement

:7-

Channel

only

Follows

DISPLAY

MODE

selection

TABLE

1-1

(cont)

TABLEA

7A18

AND

MAINFRAME

FREOUENCY

RESPONSE

MHz

TABLE

1-2

ENVIRONMENTAL

CHARACTERISTIC

Refer to

Specification

for

the

associated oscilloscope

TABLE

1-3

PHYD!CAL

Fits

all

7000-series

plug-in

compartments

Pounds

Ounces

kilograms)

Specification-7A18/7Al8N

With

7400S=,ip

MHz

General

effectively

use

the

7A18,

the

operation

and

capabili-

ties

of the

instrument

must

known

This section

des-

cribes

front-panel

control functions,

general

information

signal

input

connections,

and

other

subjects

that

pertain

various

measurement

applications

Installation

SECTION

OPERATING

INSTRUCTIONS

Change

information,

any,

affecting

this

section

will

found

at the rear of the

manual

The

7A18

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

of the

7A18

with

the oscilloscope tracks

and

fully

insert

The

front

will

flush

with

the front of the

oscilloscope

when

the

7A18

fully

inserted,

and

the

latch

the

bottom-left corner

of the

7A18

will

place

against

the

front

panel

remove

the

7A18,

pull

the

latch

(which

inscribed

with

the unit

identification

"7A18"

"7A18N")

and

the

7A18

will

unlatch

Continue

pulling

the

latch

slide

the

7A18

out

of 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



Selects

signal

input

coupling

mode

AC-The

component

of the

sig-

nal

coupled

to the

amplifier

input

while

the

component

blocked

Fig

2-1

Front-panel

controls

and

connectors

(7A18shown

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 to

(7A18

only)

7A18/7A18N

DC-Both

and

components

the

signal

are

coupled

to the

amplifier input

Controls

position of the

trace

Posi-

tioning

the

trace

the

"ADD"

Display

Mode

controlled

POSITION

control

only

Deflects

trace

about

division

for

trace

identification

instruments

with

readout,

also

replaces

readout

with

the

word

"IDENTIFY"

Operating

Instructions-7A18/7A181\1

VOLTS/DIV



Selects

calibrated

deflection

factors

from

mV/Div

V/Div

;

ten

steps

1-2-5

sequence

VARIABLE



Provides

continuously

variable

(VOL1

S/DIV)



calibrated

settings

between

cali-

brated

steps

Extends

the

deflection

factor

range

volts/division

GAIN

Adjustment



When

the

VARIABLE

control

pushed

in,

becomes

front-panel

screw-driver

adjustment

for

cali-

bration

of deflection factor

DISPLAY

MODE



Selects

one

the

following

modes

operation

2-2

1-A

single-trace

display

the

signal

applied

Channel

ALT---A

dual-trace

display

the

signal

applied

both

channels

-T-

channels

are

alternately

dis-

played,

and

switching

occurs

the

end

of each

time-base

sweep

ADD-Algebraically

adds

the

signals

applied

the

and

input

connectors,

and

the

algebraic

sum

displayed

the

CRT

The

POLARITY

switch allows

the

display

Position

the

trace

this

dis-

play

mode

controlled

POSITION

control

only

CHOP---A

dual-trace

display

the

signals

applied

both

channels

Thetwo

channels

time-share

the

sweep

determined

the

in-

dicator

oscilloscope

2--A

single-trace

display

the

signal

applied

TRIGGER

SOURCE



Selects

source

the

trigger

signal

The

trigger signals

provide

internal

triggering

for the

oscilloscope

time-

base

units



nternal



triggering



signal

obtained

from

signal

applied

MODE--Internal

trigger

signal

auto-

matically

follows

DISPLAY

MODE

selection

ADD

CHOP

display

modes,

the

trigger

signal

the

algebraic

sum

and

trigger

2---Internal

trigger

signal

obtained

from

signal

applied

POLARITY



Provides

means

inverting

the

display

Introduction

Signal

Connections

-UP--A

positive-going

signal at

the

input

connector

deflects

the

CRT

display

upward

INVERT--A

positive-going

signal at

the

input

connector

de-

flects

the

CRT

display

down-

ward

GENERAL

OPERATINGINFORMATION

For

single-trace

operation,

either

the

two

identical

amplifier

channels

can

used

independently

setting

the

DISPLAY

MODE

and

TRIGGER

SOURCE

switches

and

connecting

the

signal

observed

the

appropriate

input

the

discussions

follow,

single-trace

operations

using

only

apply

equally

only

general,

probes

offer

the

most

convenient

means

connecting

signal

the

input

the

7A18

10X

atten-

uator

probe

offers

high

input

impedance

and

allows

the

circuit

under

test

perform

very

normal

operating

conditions

The

Tektronix

P6053A

probe,

with

its

readout

cod~ng

ring,

was

designed

specifically

for

use

with

Tektronix

7A-

series

amplifier

units

equipped with readout

The

readout

coding

ring

the

probe

connects

circuit

the

ampli-

fier

unit

which

automatically

corrects

the

readout

displayed

on the

CRT

the

actual

deflection

factor

the

tip

the

probe

being

used

For

probes

to be

used

with

amplifier

units

without

readout,

see

the

Tektronix,

Inc

catalog

Vertical

Gain

Check

and

Adjustment

check

the

gain of

either

channel,

set

the

VOLTS/DIV

switch

and

connect

mV,

kHz

signal

from

the

oscilloscope

calibrator

the

input

connector

the

chan-

nel

being

checked

The

vertical

deflection

should

exactly

four

divisions

not,

adjust

the

front-panel

GAIN

for

exactly

four

divisions

of deflection

The

GAIN

adjustment

engaged

pressing

the

GAIN

control

knob

and

turn-

ing

the

knob

with a

narrow-blade

screwdriver

(see

Front

Panel

Controls

and

Connectors)

Turn

the

knob

clockwise,

then counterclockwise,

until

the

GAIN

control

engaged

When

the

GAIN

control

engaged,

the

vertical

deflection

will

change

the

knob

turned

"Turn

the

GAIN

control

knob

with

the

screwdriver

until

the

deflection

set

exactly

four

divisions,

then

remove

the

screwdriver

Input

Coupling

The

Channel

and Channel 2

coupling

(AC-GND-DC)

switches

allow

choice

input

coupling

methods

The

type

display desired

and

the

applied

signal will

determine

the

coupling

use

The

coupling

position

must

used

display

the

component

the

signal

must

also

used

display

signals

below about

hertz

(ten

hertz

with a

10X

probe)

and

square

waves

with

low-frequency

components

these

signals

are

attenuated

the

position

the

coupling

position,

the

component

the

signal

blocked by a

capacitor

the

input

circuit

The

coupling

position

provides

the

best

display

signals

with

component

much

larger

than

the

components

The

precharge

feature

should

used with

large

inputs

use

this

feature,

first

set

the

coupling

GND

Connect

the

probe

the

circuit

and

wait

about

two

seconds

for

the

coupling

capacitor

charge

Then

set

the

coupling

The

GND

position

provides

ground

reference

the

input

the

amplifier

without

externally

grounding

the

input

connectors

However,

the

signals

connected

the

inputs

are

not grounded,

and

the

same

load

presented

the

signal

source

VOLTS/DIV

and

VARIABLE

Controls

The

amount

vertical

deflection

produced

by a

signal

determined by

the

signal

amplitude,

the

attenuation

factor

the

probe, the

setting

the

VOLTS/DIV

switch,

and

the

setting

the

VARIABLE

control

Calibration

deflec-

tion

factors

indicated

by the

settings

the

VOLTS/DIV

switch

apply

only

when

the

VARIABLE

control

the

calibrated

(CAL

IN)

position

The

VARIABLE

control

provides

variable,

uncalibrated

settings

between

the

calibrated steps

the

VOLTS/DIV

switch

With

the

VARIABLE

control

fully

counterclock-

wise

and

the

VOLTS/DIV

set

volts/div

the

uncali-

brated

vertical

deflection factor

extended

to at

least

volts/division

applying

calibrated

voltage

source

the

input

connector,

any

specific

deflection factor

can be

set

within the

range

the

VARIABLE

control

REV

APR

1974

POLARITY

Switch

DISPLAY

MODE

Switch

Operating Instructions---7A18/7A18N

The

POLARITY

switch

may

used

invert

the

displayed

waveform

the

signal

applied

the

input

This

particularly

useful

added

operation

the

7A18

when

differential

measurements

are

made

The

POLARITY

switch

has

two

positions,

+UP

and

INVERT

the

+UP

position,

the displayed

waveform

will

have

the

same

polarity

the

applied

signal

and

positive

voltage

will

move

the

CRT

trace

the

INVERT

position,

positive-going

waveform

the

input

will

displayed

the

CRT

inverted

form

and a

positive

voltage

will

move

the

trace

down

For

single-trace

operation,

apply

the

signal

either

the

input

the

input

and

set

the

DISPLAY

MODE

switch

the

corresponding

position

display

signal

one

channel independently

when

signal

also

applied

the

other

channel,

simply

select

the

desired

channel

setting

the

DISPLAY

MODE

switch to

the

appropriate

position

Alternate

Mode

The

ALT

position of

the

DISPLAY

MODE

switch

produces

display

which

alternates

between

channel

and

channel

with each

sweep

on the

CRT

Although

the

ALT

mode

can be

used

all

sweep

rates,

the

CHOP

mode

provides

satisfactory

display

sweep

rates

below

about 0

millisecond/division

slow

sweep

rates

alternate

mode

switching

becomes

visually per-

ceptible

Add

Mode

The

ADD

position

of the

DISPLAY

MODE

switch

can be

used to

display

the

sum

or difference of

two

signals,

for

common-mode

rejection

remove

undesired

signal,

for

offset

(applying

voltage

one

channel

offset

the

component

of a

signal

the

other

channel)

The

overall

deflection

factor

the

ADD

mode

with

both

VOLTS/DIV

switches

set

the

same

position

the

deflection

factor

indicated

either

VOLTS/DIV

switch

However,

the

and

VOLTS/DIV

switches

are set

different

deflection

factors,

the

resultant

amplitude

difficult

determine

from

the

CRT

display

this

case,

the

voltage

amplitude

the

resultant

display

can be

determined

accurately

only

the

amplitude

the

signal

applied

one

channel

known

the

ADD

mode,

positioning

the

trace

controlled

the

channel

POSITION

control

only

Chop Mode

The

CHOP

position of

the

DISPLAY

MODE

switch

produces a

display

which

electronically

switched

between

channels

approximately a

500

kilo-

hertz

rate

(controlled

by mainframe)

general

the

CHOP

mode

provides

the

best

display

sweep

rates

slower

than

2-3

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