Tektronix 7A18 User manual

INSTRUCTION

MANUAL

7A18/7A18N

DUAL

TRACE

AMPLIFIER

Tekfronix,

Inc.

Box

500

•

Beaverton,

Oregon

97005

•

Phone

644·0161

•

Cables:

Tektronix

070-1126-01 1271

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All TEKTRONIX ,in$#uments are warranted against

defective materIals !ilfldworkmanship for one year. Any

questions withresp'eC't

the

warranty should be taken up

with

your

TE'KTRel'UXField

Engineer or representative.

x>"

All

requests for"repai';s and replacement parts should be

directed

tbeTEKrRONJ~FieldOfficeor

representati

your

areai~~This

wilt'!'~~~~re

you

tti~';ii~stestPos'

•

service.

Pleas~:jnchlfle

tb~)ilfl~rument

Ty~.~~umber

Number and Serial

all

'Cop¥~~:'!®<~~;~,'~~~

material

1974,

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 of

Tektronix, Inc.

U.S.A. and foreign TEKTRONIX products covered by U.S.

and foreign patents

and/or

patents pending.

TEKTRONIX is a registered trademark

Tektronix, Inc.

7A18/7A18N

TABL.E

CONTENTS

SECTION

SPECIFICATION

Introduction

Electrical

Characteristics

7A18

And

Mainframe

Frequency

Response

Environmental

Characteristics

Physical

Characteristics

SECTION

OPERATING

INSTRUCTIONS

Installation

Front

Panel

Controls

and

Connectors

General

Operating

Information

Basic

Applications

SECTION

CIRCUIT

DESCRIPTION

ntrod

uction

Block

Diagram

Description

Detailed

Circuit

Description

SECTION

MAINTENANCE

Preventive

Maintenance

rou

blesh

ooting

Replacement

Parts

Component

Replacement

SECTION

CALIBRATION

©I

Recalibration

Interval

Test

Equipment

Required

Part

I -

Performance

Check

Part

Adjustment

Page

1·1

1·3

2·1

2·2

2·4

3·1

4·1

4·3

4·4

5·1

5·3

5·7

OPTION

INFORMATION

SECTION

ELECTRICAL

PARTS

LIST

Abbreviations

and

Symbols

Parts

Ordering

Information

SECTION

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

CHANGE

INFORMATION

Abbreviations

and

symbols

used in

this

manual

are

based

taken

directly

from

IEEE

Standard

260

"Standard

Symbols

for

Units",

MIL·STD·12B

and

other

standards

of_

the

electronics

industry.

Change

information,

any,

located

the

rear

this

ma-nual.

REV_

JUNE

1974

• -

1 to

•

=(@)

•

~.~

I::"

•

CH'

•

_"",!"",o

'A"

CH'

...

Fig. 1·1.

7A18

~nd

Amplifier.

7A18nAl~8N

____________________________________________________________________

____

______

7A1817A18N

SECTION

SPECIFICA

TION

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

encod

ing

capab

ilities and

"IDENTIFY"

function

are

provided

only

the

7A18.

All

references

made

the

7A18

apply

equally

the

7A18N

unless

otherwise

noted.

The

7A 18

dual-channel,

medium-bandwidth

amplifier.

Internal

gain

and

compensa-

tion

circuits

are

automatically

switched

correspond

the

setting

the

VOL

TS/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

mV/Div

V/Div;

ten

steps

a 1,

2,5

sequence.

f---~--

Deflection

Factor

Accuracy

Within

with

GAIN

adjusted

mV/Div.

-------~~-------

Uncalibrated

Continuously

variable

between

calibrated

(VARIABLE)

steps;

extends

deflection

factor

least

12.5

V/Div.

-----~--------~~-

~~--------~---

-.-~----

---------

1---

GAIN

Permits

adjustment

deflection

factor

for

calibrated

operation

with

all

7000-

series

oscilloscopes.

~~----~

---------.------~-----

-~--

"._--"

---

...

_--------

-.-

------~----~

f------------.-~-----

Frequency

Response

System

Dependent

div

reference

signal)

Upper

Bandwidth

DC (Direct)

Coupled

See

Table

-~--.---

~--

Lower

Bandwidth

Hertz

less

AC (Capacitive)

Coupled

--------

With lOX

Probe

Hertz

less

----

1-1

Specification-7A

18/7

A18N

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

solation

50:

display

ratio

megahertz.

Input

Rand

Resistance

± 2%

Capacitance

Approximately

20_0

Product

Within

±1%

between

all

deflection

factors.

Displayed

Noise

(Tangentially

Measured)

300

microvolts

less

/Div in

7000-Series

Oscilloscope_

Overdrive

Recovery

Time

0.1 ms

less

recover

within

one

division

after

the

removal

an over-

drive signal

divisions

-75

divisions regardless

overdrive

signal

duration.

Common

Mode

Rejection

least

10:1

megahertz_

Ratio

Drift

with

Time

(ambient

0_02 division

less in

anyone

minute,

temperature

and

line

voltage

after

one

hour

warmup.

constant)

Drift

with

Temperature

than

0.01 division

per

degree

(line

voltage

constant)

Time

Delay

between

Channels

700

picoseconds

less_

Display

Modes

Channell

only_

Dual-trace,

alternate

between

channels.

Added

algebraically.

Dual-trace

chopped

between

channels_

Channel

only.

1-2 @

Specification-7

18/7

A18N

TABLE

1-1

(cont)

----.--.----.-.-.----.-.------.-.--

----.~~-.----.-.----;---.-.-

....

----.--~.---.------.---~-.-~--~-

Characteristic

Trigger source Selection

Performance Requirement

Channell

only.

Follows DISPLAY MODE selection.

Channel 2 only

TABLE A

7A18

AND MAINFRAME

FREQUENCY RESPONSE

Supplemental Information

W_;th7:7:::::,~~J_~_~~h6:5::::'"

-_1

With 7400 Series

MHz

TABLE 1-2

ENVIRONMENTAL CHARACTERISTIC

Refer

the Specification for the associated oscilloscope.

TABLE 1-3

PHYSICAL

:_i:_~_9_h_t

~~~--_-

- -

:'::~~~~~'~:~:::'~:~""

-----~-----------

NOTES

-----------.------------~----------------------------------------

...

----~.--------

--------------------------------------

--~-.-

..-

..•.

-.....

----

~~~~~~-

-------------------------------

--.--------------.--~~~~-

7A18

7A18N

SECTION

OPERA

TING

INSTRUCTIONS

Change

information,

any, affecting this section

will

found

the rear

the manual.

General

effectively

use

the

18, the operation and capabili·

ties

the instrument must be

known.

Thi

s section

des·

cribes front·panel co

ntrol

functions,

neral

information

signal

input

connections,

other

bjects that pertain

rious measurement application

Installation

The

calibrated and ready

for

use

received.

installed

any compartment

ektron

7000

Ser

ies oscilloscopes,

but

intended for principal use in

vertical plug·in compar

tment

install,

the upper

and lower rails

the 7A18

with

the oscilloscope tracks and

fully insert

it.

The

front

will

be flush

with

the

front

the

oscilloscope when the

18 is

fully

inserted, and the latch

at the

bottom

·l

eft

corner

the

will

be in place

aga

inst the

front

panel.

remove the 7A 18,

pull

on the latch (which

inscribed

with

the

unit

identification

18"

8N")

and the 7A 18

latch.

Continue

pulling

on the latch to

slide the 7A 18

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·

Input

Connector

AC·GND·DC

Provides sign

connection to t

channel.

Selects signal

input

coupling

mode.

AC-The AC component

the si

g·

coupled to the amplifier

input

whi

le the DC

component

is blocked.

GND

-Grounds the

amplifier

input

while

maintaining the

same

load

for

the

input

signal.

ovides a

charge path

for

the

coupli

capacitor to precharge t

input

circu

i t before switching the

input

AC.

eM2

...ot..AR11"Y

••

J:!

,.....,

........

~H2

DUAl

T1lAC£ AMf"UFtEfII

F;9. 2·1.

Front

·punel co

ntr

ols lind

&<:lors.

17A 18

snown

POSITION

IDENTIFY

A 18 o

nly

)

-80

and

components

the signal are coupled to the

amplifier

input.

Controls

positio

the trace. Posi-

tioning

the tra

the

"ADD"

Display Mode

ntr

olled by

POSITION

control

only.

Deflects trace about 0

division

for

trace id

entification.

In instruments

th readout, also replaces readout

h the

word

"IDENTIFY".

2·'

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