Tektronix 7A18 User manual

INSTRUCTION

MAN

UAL

Tektronix,

Inc,

Box

500

Beaverton,

Oregon

97005

Phone

644-0161

Cables:

Tektronix

070-1126-01

1271

IDE

eque

MCR

vou

SECTION

7A18/7A18N

TABLE

CONTENTS

SPECIFICATION

Introduction

Electrical

Characteristics

7A18

And

Mainframe

Frequency

Response

Environmental

Characteristics

Physical

Characteristics

OPERATING

INSTRUCTIONS

Installation

Front

Panel

Controls

and

Connectors

General

Operating

Information

Basic

Applications

CIRCUIT

DESCRIPTION

Introduction

Block

Diagram

Description

Detailed

Circuit

Description

MAINTENANCE

Preventive

Maintenance

Troubleshooting

Replacement

Parts

Component

Replacement

CALIBRATION

Recalibration

Interval

Test

Equipment

Required

Part

—

Performance

Check

Part

—

Adjustment

Page

SECTIONG

SECTION

3-1

4-1

OPTION

INFORMATION

ELECTRICAL

PARTS

LIST

Abbreviations

and

Symbols

Parts

Ordering

Information

DIAGRAMS

AND

CIRCUIT

BOARD

ILLUSTRATIONS

Symbols

and

Reference

Designators

Voltage

and

Waveform

Conditions

MECHANICAL

PARTS

LIST

Mechanical

Parts

List

Information

Index

Mechanical

Parts

Illustrations

Mechanical

Parts

List

Accessories

4-3

CHANGE

INFORMATION

4-4

Abbreviations

and symbols

used

this

manual

are

based

5-1

taken

directly

from

IEEE

Standard

260

“Standard

5-1

Symbols

for

Units’,

MIL-STD-12B

and

other

standards

5-3

the

electronics

industry.

Change

information,

any,

5-7

located

the

rear

this

manual.

REV.

JUNE

1974

7A18/7A18N

Fig.

1-1.

7A18

and

7A18N

Amplifier.

—I|

—J

—

7A18/7A18N

SECTION

SPECIFICATION

Change

information,

any,

affecting

this

section

will

found

the

rear

the

manual.

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

the

7A18

apply

equally

the

7A18N

unless

otherwise

noted.

The

7A18

dual-channel,

medium-bandwidth

amplifier.

Internal

gain

and

compensa-

tion

circuits

are

automatically

switched

correspond

the

setting

the

VOLTS/DIV

switch.

Channel

can

inverted

for

differential

measurements.

The

7A18

can

operated

any

plug-in

compartment

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 a

five

minute

warmup

unless

otherwise

noted.

TABLE

1-1

ELECTRICAL

Characteristic

Performance

Requirement

Supplemental

Information

Deflection

Factor

Calibrated

Range

sequence.

mV/Div

V/Div;

ten

steps

ina

Deflection

Factor

Accuracy

mV/Div.

Within

with

GAIN

adjusted

Uncalibrated

(VARIABLE)

least

12.5

V/Div.

Continuously

variable

between

calibrated

steps;

extends

deflection

factor

GAIN

Permits

adjustment

deflection

factor

for

calibrated

operation

with

all

7000-

series

oscilloscopes.

Frequency

Response

System

Dependent

div

reference

signal)

Upper

Bandwidth

(Direct)

Coupled

See

Table

Lower

Bandwidth

Hertz

less

(Capacitive)

Coupled

With

10X

Probe

Hertz

less

1-1

Specification—7A18/7A18N

TABLE

1-1

(cont)

Characteristic

Performance

Requirement

Supplemental

Information

Maximum

Input

Voltage

Coupled

250

volts,

(DC

Peak

AC);

com-

ponent

500

volts

peak-to-peak

maxi-

mum,

one

kilohertz

less.

Coupled

500

volts,

(DC

Peak

AC);

compo-

nent

500

volts

peak-to-peak

maxi-

mum,

one

kilohertz

less.

Channel

Isolation

50:1

display

ratio

megahertz.

Input

and

Resistance

Capacitance

Approximately

20.0

Product

Within

+1%

between

all

deflection

factors.

Displayed

Noise

(Tangentially

Measured)

300

microvolts

less

mV/Div

7000-Series

Oscilloscope.

Overdrive

Recovery

Time

0.1

less

recover

within

one

division

after

the

removal

over-

drive

signal

+75

divisions

—75

divisions

regardless

overdrive

signal

duration.

Common

Mode

Rejection

Ratio

least

10:1

megahertz.

Drift

with

Time

(ambient

temperature

and

line

voltage

constant)

0.02

division

less

any

one

minute,

after

one

hour

warmup.

Drift

with

Temperature

(line

voltage

constant)

than

0.01

division

per

degree

Time

Delay

between

Channels

700

picoseconds

less.

Display

Modes

Channel

only.

Dual-trace,

alternate

between

channels.

Added

algebraically.

Dual-trace

chopped

between

channels.

Channel

only.

1-2

TABLE

1-1

(cont)

Specification—7A18/7A18N

Characteristic

Performance

Requirement

Supplemental

Information

Trigger

source

Selection

Channel

only.

Follows

DISPLAY

MODE

selection.

Channel

only.

TABLE

7A18

AND

MAINFRAME

FREQUENCY

RESPONSE

With

7700

Series

MHz

With

7500

Series

MHz

With

7400

Series

MHz

TABLE

1-2

ENVIRONMENTAL

CHARACTERISTIC

Refer

the

Specification

for

the

associated

oscilloscope.

TABLE

1-3

PHYSICAL

Size

Fits

all

7000-series

plug-in

compartments.

Weight

Pounds

Ounces

(1.4

kilograms)

1-3

NOTES

7A18/7A18N

SECTION

OPERATING

INSTRUCTIONS

Change

information,

any,

affecting

this

section

will

found

the

rear

the

manual.

General

effectively

use

the

7A18,

the

operation

and

capabili-

ties

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

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

the

7A18

with

the

oscilloscope

tracks

and

fully

insert

it.

The

front

will

flush

with

the

front

the

oscilloscope

when

the

fully

inserted,

and

the

latch

the

bottom-left

corner

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

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.

Provides

signal

connection

the

channel.

Input

Connector

AC-GND-DC

Selects

signal

input

coupling

mode.

AC—The

component

the

sig-

nal

coupled

the

amplifier

input

while

the

component

blocked.

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

AC,

Fig.

2-1.

Front-panel

controls

and

connectors.

(7A18

shown.)

DC-—Both

and

components

the

signal

are

coupled

to the

amplifier

input.

POSITION

Controls

position

the

trace.

Posi-

tioning

the

trace

the

“ADD”

Display

Mode

controlled

POSITION

control

only.

IDENTIFY

Deflects

trace

about

0.2

division

for

(7A

only)

trace

identification.

instruments

with

readout,

also

replaces

readout

with

the

word

“IDENTIFY”.

2-1

Operating

Instructions—7A18/7A18N

VOLTS/DIV

Selects

calibrated

deflection

factors

from

mV/Div

V/Div;

ten

steps

1-2-5

sequence.

VARIABLE

Provides

continuously

variable

un-

(VOLTS/DIV)

calibrated

settings

between

cali-

brated

steps.

Extends

the

deflection

factor

range

12.5

volts/division

more.

When

the

VARIABLE

control

pushed

in,

becomes

front-panel

screw-driver

adjustment

for

cali-

bration

deflection

factor.

GAIN

Adjustment

DISPLAY

MODE

Selects

one

the

following

modes

operation:

1-—A

single-trace

display

of the

signal

applied

Channel

ALT—A

dual-trace

display

the

signal

applied

both

channels.

The

channels

are

alternately

dis-

played,

and

switching

occurs

the

end

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

1—CH

Position

the

trace

this

dis-

play

mode

controlled

POSITION

control

only.

CHOP—A

dual-trace

display

the

signals

applied

both

channels.

The

two

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.

1—Internal

triggering

signal

obtained

from

signal

applied

MODE-~—Internal

trigger

signal

auto-

matically

follows

DISPLAY

MODE

selection.

ADD

2-2

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.

+UP—A

positive-going

signal

the

input

connector

deflects

the

CRT

display

upward.

INVERT—A

positive-going

signal

the

input

connector

de-

flects

the

CRT

display

down-

ward.

GENERAL

OPERATING

INFORMATION

Introduction

For

single-trace

operation,

either

of the

two

identical

amplifier

channels

can

be 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.

Signal

Connections

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

coding

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

the

CRT

the

actual

deflection

factor

the

tip

the

probe

being

used.

For

probes

used

with

amplifier

units

without

readout,

see

the

Tektronix,

Inc.

catalog.

Vertical

Gain

Check

and

Adjustment

check

the

gain

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

deflection.

The

GAIN

adjustment

engaged

pressing

the

GAIN

control

knob

and

turn-

ing

the

knob

with

narrow-blade

screwdriver

(see

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