Tektronix 7A22 User manual

Tektronix,

Inc

Box

500

Beaverton,

Oregon



97077

070-0931-00

Product

Group

CHECK

FOR

CHANGE

INFORMATION

REAR

THIS

MANUAL

COMMITTED

EXCELLENCE

MANUAL

Serial

Number

First

Printing

JUL

1969

Revised

SEP

1986

1969

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

by U

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

B000000



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

REVSEP

1981

Section

Section 2



OPERATING

INSTRUCTIONS

(cont)

7A22

Page

Voltage

Measurement

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



2-4

Signal

Input

Connectors

.....

......



2-4

High

Input

Impedance

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



2-5

Display

Polarity

....

........

......



2-5

Deflection

Factor

. . . .

......



2-5

Bandwidth

Selection

......

........



2-5

Voltage

Comparison

Measurements

...



2-10

Differential

Operation

........

......

2-10

Offset

Operation

......

. .

......



2-11

Input

Overdrive

Indicator

...

.......



2-12

Readout

. .

......

........

2-12

Trace

Identify

..........

........



2-13

The

remaining

portion

this

Table

Contents

lists

the

servicing

instructions

These

servicing

instructions

are

for

use

qualified

personnel

only

avoid

electrical

shock,

notperform

any

servicing

other

than

that

called

out

the

operating

instructions

unless

qualified

doso

Section 3

Page

SPECIFICATION

Introduction

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

.....

1-1

Electrical

Characteristics

....

. .

......

1-1

Deflection

Factor

.......

1-1

Gain

. .

......

. .

......

. .

.......

1-1

Differential

Dynamic

Range

......

1-1

Offset

.....

.......

. .

.......

1-1

Frequency

Response

...

. .

.......

1-1

Bandwidth

Limit

.......

. .

.......

1-1

Recovery

Time

........

.......

1-1

Common-Mode

Signal

Range

....

1-1

Common-Mode

Rejection Ratio

...

1-1

Maximum

Input

Voltage

......

1-3

Input

and

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

1-3

Maximum

Input

Gate

Current

...

1-3

Variable

Balance

......

........

1-3

Step

Attenuator

Balance

...

. .

1-3

Displayed Noise

(Tangentially

Measured)

. .

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

. .

1-3

Drift

....

.......

. .

1-3

Isolation

Between

and

---

Inputs

.....

. .

.......

......

...

1-3

Environmental

Characteristics

....

. .

1-3

Altitude

....

. .

.......

......

. .

1-3

Transportation

......

. .

......

. .

1-3

Physical

Characteristics

. .

......

. .

1-3

Finish

.....

. .

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

. .

1-3

Dimensions

. .

......

.......

. .

1-3

Weight

....

. .

......

. .

.......

. .

1-3

OPERATING

INSTRUCTIONS

Introduction

.. . .

......

........

. .

2-1

Front

Panel

Controls

and

Connectors

2-1

Operating

Instructions

...........

. .

2-2

First

Time

Operation

........

. .

2-2

General

Operating

Information

. .

....

2-4

Trace

Drift

.......

........

....

2-4

Input

Gate

Current

...

. .

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

2-4

CIRCUIT

DESCRIPTION

Introduction

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

......

. . .

3-1

Block

Diagram

Description

......

. . .

3-1

Input

Coupling

.......

......

. . .

3-1

Input

Attenuators

....

......

. . .

3-1

Preamp

......

........

....

. . .

3-1

---3

Point

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

. . .

3-1

Output

Amplifier

.....

......

3-2

--3

Point

.....

......

. . .

3-2

General

Information

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

. . .

3-2

Feedback

Amplifiers

.......

. .

3-2

Differential

Configuration

.....

. . .

3-3

Detailed

Circuit

Description

......

. .

3-3

Input

Coupling

......

. .

3-3

Input

Attenuators

...........

. .

3-4

7A22

SECTION

REV

MAR

197

CIRCUIT

DESCRIPTION

(cont)

Page

SECTION

MAINTENANCE

(cont)

Page

Gate

Current

Compensation

3-4

Special

Parts

.......

....

4-2

Input

Amplifier

... .

.......

3-4 Soldering

Techniques

......

4-2

X15

Preamp

....

. .

....

3-4

Component

Replacement

Information

.........

....

4-3

Balance

..........

3-4

Troubleshooting

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

4-5

Floating

Power

Supply

...

3-5

Introduction

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

4-5

Common-Mode

Rejection

3-5

Indicator

Oscilloscope

.....

4-5

Cross

Neutralization

....

3-6

Operating

Procedure

and

Input

Overdrive

Protection

3-7 Control

Settings

. .

......

4-5

Offset

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

3-7

Trouble

Symptoms

....

...

4-5

Offset

Generator

.......

3-7 Visual

Inspection

.........

4-5

Input

Overdrive

Indicator

3-8

Calibration

Check

........

4-5

--3

Point

Selector

3-9

Detailed

Troubleshooting

...

4-5

Output

Amplifier

.........

3-9

Test

Equipment

Recommended

4-6

Gain

Switching

Amplifier

3-9

Balance

Check

........

4-6

Variable

Output

stage

...

3-11

Troubleshooting

Direct

Signal

Output

Amplifier

. .

3-11

Replacement

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

4-6

Trigger

Output

Amplifier

. .

3-11

Components

Checks

......

4-6

Indicator

Oscilloscope

Readout

3-11

Transistors

...........

4-6

Probe

Sensing

.........

3-11

Diodes

....

.........

4-8

Trace

Identify

.........

3-11

Resistors

. .

...

....

4-8

Capacitors

....

.....

4-9

MAINTENANCE

Repackaging

for

Shipment

...

4-9

Introduction

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

4-1

Preventive

Maintenance

......

4-1

General

4-1

SECTION

PERFORMANCE

CHECK/

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

CALIBRATION

PROCEDURE

Cleaning

Front

Panel

......

4-1

Introduction

......

.........

5-1

Cleaning

Interior

.........

4-1

Test

Equipment

Required

...

5-1

Visual

Inspection

.......

4-1

General

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

5-1

Transistor

Checks

.....

. .

4-1

Short

Form

Procedure

.......

5-2

Calibration

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

4-1

Performance

Check/Calibration

Corrective

Maintenance

......

4-1

Procedure

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

...

5-3

General

....

.........

4-1

General

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

5-3

Obtaining

Replacement

Parts

4-2

Preliminary

Procedure

.....

5-3

SECTION

REV

MAR

197

Conpensation

...

. .

....

5-9

-Input

Atten

Compensation

5-9

---Input

Atten

Shunt

Compensation

.........

5-10

-3dB

Point

........



5-11

Abbreviations

and

symbols

used

this

manual

are

based

taken

directly

from

IEEE

Standard

260

"Standard

Symbols

for

Units",

MIL

STD-12B

and

other

standards

the

electronics

industry

Change

information,

any,

located

atthe

rear of

this

manual

PERFORMANCE

CHECK/

CALIBRATION

PROCEDURE

(cont)

Page

L F

---3

Point

......



5-11

CMRR

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

5-12

Input

Overdrive

Indicator

5-12

Differential

Dynamic

Range

5-13

Overall

Noise

Level

(Measured

Tangentially)

. .

5-13

Overdrive

Recovery

Time



5-14

ELECTRICAL

PARTS

LIST

Abbreviations

and

Symbols

Parts

Ordering

Information

Index

Electrical

Parts

List

Electrical

Parts

List

DIAGRAMS

AND

MECHANICAL

PARTS

ILLUSTRATIONS

Diagrams

Mechanical

Parts

Illustrations

MECHANICAL

PARTS

LIST

Mechanical

Parts

List

Information

Index

Mechanical

Parts

Illustrations

Mechanical

Parts

List

Accessories

7A22

PERFORMANCE

CHECK/

SECTION

CALIBRATION

PROCEDURE

(cont)

Page

Check

or Adjust

..........

5-4

Step Atten

Balance

5-4

Variable

Balance

.......

5-4

Coarse

Balance

.....

5-4

Gate

Current

Zero

.....

5-5

----

Gate

Current

Zero

.....

5-5

GAIN

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

5-5

VARIABLE

Control Ratio

. .

5-5

VOLTS/DIV

Gain

Switching

5-5

SECTION

Isolation

between

and

Inputs

...........

5-6

Total

Offset

Range

...

5-6

C241

+Cross

Neutralization

5-7

C141

--Cross Neutralization

5-7

C115

-I-Input

Atten

Time

Constant

. .

.........

5-7

SECTION

C215

-Input

Atten

Time

Constant

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

5-7

Input

Atten

Accuracy

....

5-8

Input

Atten

Differential

Balance

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

5-8

SECTION

--l-Input

Atteh

Series

Type

7A22

Fig

1-1

Type

7A22

Differential

Amplifier

Introduction

The

Type

7A22

Vertical

Plug-in

coupled

differ-

ential

amplifier

with

excellent

common-mode

rejection

char-

acteristics

and

high gain

for

low

level

applications

The

Offset capability

of the

Type

7A22

allows

the

display

the

very

small

low-frequency

signals

containing

large

component,

deflection

factors

not

possible

with

coupling

The

vertical

deflection

factor

range

the

Type

7A22

from

10/W



The

high

and

low

fre

quency

--3



points

can



selected

the

front

panel,

set the

bandwidth

the

instrument

Thus,

for

low

fre-

quency

applications

the

signal-to-noise

ratio

can

improved

restricting

the

bandwidth

the

Type

7A22

The

band-

width

selection

and

excellent

drift-with-time characteristics

provide

measurement

capabilities

the

biomedical,

trans-

ducer,

and

other

areas

which

require

stable,

low

deflection

factor,

low

noise

measurements

The

Type7A22

designed

for

use

Tektronix

7000

Series

oscilloscopes

The

electrical

characteristics

described

in this

section

are

valid

over

the

stated

environmental

range

for

instruments

calibrated

ambient

temperature

+20'C

+30

and

after

minute

warmup

unless

otherwise

noted

ELECTRICAL

CHARACTERISTICS

Characteristic

Deflection

Factor

(VOLTS/DIV)

Gain

Ratio

Accuracy

VAR

(CAL

IN)

Range

Differential

Signal

Range

(DC

OFFSET'

not

used)

10 ~tV/Div

mV/Div

V/Div

Change

information,

any,

affecting

this

section

will

found

at the

rear

of the

manual

Performance

Requirements

Within

with

GAIN

adjusted

mV/div

Continuously

variable

;

extends de-

flection

factor

least

V/div

Permits

adjustment

deflection

factor

mV/DIV

for

all

main-

frames

least

_F_-1

least

J-10

least

--1-100V

least

4-1000V

OFFSET

COARSE

Range

from

Electrical

Zero

10 [tV/Div

mV/Div

V/Div

to 10

V/Div

Frequency

Response

div

Reference)

Overall

Frequency

Response

(Direct)

Coupled

Input

(Capacitive)

Cou-

pled

Input

Lower

Bandwidth

Frequency

Bandwidth

Limit

Accuracy

---3

POINT

100

MHz

Accuracy

-3

POINT

kHz

mV/Div

V/Div

Common-Mode

Rejection

Ratio

(Direct)

Coupled

(Capacitive)

Coupled

Type

7A22

least

+100V

-100V



least



+1000V



--1000

------

- --- --

-----------



------

Within

10%

selected

frequency

steps

a 1-10

sequence

/us

less

recover

within

.5%

zero

level

after

the

re-

moval

---

test

input

ap-

plied

for

Test

signal not

ex-

ceed

Differential

Signal

Range

Specified

aberration

.5%)

based

test

signal

amplitude

least

+10V

and

-10V

least

+100V

and

-100V

least

+500V

and

----500V

CMRR



100



kHz



kHz 100 kHz



MHz

Verification

Points

ELECTRICAL

CHARACTERISTICS

(cont)

Characteristic v

Maximum

Input

Voltage

(each

input)

(Direct)

Coupled,

-f-

Peak

AC,

Component

MHz

less

10 ttV/Div



mV/Div



V/Div



10V/

Div

(Capacitive)

Coupled

Input

Voltage

(Capacitive)

Coupled

Input

Rejection

Input

and

Resistance

Capacitance

& C

Product

Maximum

Input

Gate

Current

10 [,V/Div



mV/

Div

Displayed

Noise

(Tan-

getially

Measured)

mV/Div

10V

Div

Display

Shift

ttV

/Div

(AC

Coupled)

Variable

Balance

Performance

Requirements

-j-_

-1-200

-A-500

-+500V,

each

input

least

5 :1

div

less

shift

with

VARIABLE

control

turned

from

fully

ccw

position

16,utV or

Div (whichever

greater),

MHz

----3

POINT,

source

resistance

250

less

Drift

with

Time

(Ambi-

ent

Temperature

and

Line

Voltage

Constant)

Short

Term

Drift

with

Ambient

Temperature

(Line

Voltage

Constant)

Isolation

between

-I-

and

Inputs

INPUT

Open

INPUT,

INPUT

Open

INPUT)

Long

Term

Finish

Dimensions

Weight

ITEM

Specification-Type

7A22

tkV

(P-P)

or 0



div

(whichever

greater)

any

minute

after

hour

warmup

~tV

(P-P)

div (whichever

greater)

any

hour

after

hour

warmup

501AV/

less

least

200

:1,

MHz

____

_CHARACTERISTIC

Front

panel

anodized

aluminum

___N_~4%

inch

-z

Ibs

Approximately

Within

between

all

de-

PLUG-INTESTED

ENVIRONMENTAL

OUTOF

INDICATOROSCILLOSCOPE

CHARACTERISTIC

flection

factors

Altitude

x-25°C____

+50C

__-

.--

Non-operating

50,000

feet

and

--55°C

Transportation

Qualified

under

National

Safe

-f-20

-t=100

each

input

Transit

Committee

test

procedure

-+-40

-±-=200

Differentially

1A,

Imo_

...

.__

.___ .___

Category

I I

-+-_

-t

:-20

___

.__

. . .

.±-4

div

:+-20

div

PHYSICAL

Introduction

Change

information,

any,

affecting

this

section

will

found

the

rear

the

manual

This

section

opens

with

brief

functional

description

the

front-panel

controls,

input

overdrive lamp,

and

input

connectors

Following

the

front-panel description

familiar-

ization

procedure

and

finally

general

discussion

the

operation

the

Type

7A22



-f-

INPUT

CONTROLS

AND

CONNECTORS

INPUT



Input

overdrive

indicator

lamp

turns

OVERDRIVE



indicate

excessive

differential

drive

the

input

amplifier

stage

Lights

when

the

differential

dynamic

range

between

input

connectors

exceeded

VOLTS/DIV



Volts

per

displayed

division

Nineteen

position

switch

used

to select

the

cali-

brated

deflection

factors

VARIABLE



Two-position

switch

activated

the

(CAL

IN)



VARIABLE

knob

select

calibrated

uncalibrated

deflection

factors

the

position,

the

VARIABLE

control

in-

operative

and

the

deflection

factor

calibrated

When

pressed

and

released,

the

knob

moves

outward

activate

the

VARIABLE

control

for

uncalibrated

de-

flection

factors

The

uncalibrated

posi-

tion

provides

continuously

variable

un-

calibrated

attenuation

between

the

cali-

brated

deflection

factors

and

extends

the

deflection

factor

least

VOLTS/DIV

GAIN



Screwdriver

adjust

control

set

the

CRT

display

scale

factor

agree

with

the

VOLTS/DIV

switch

indication

Adjusted

for

proper

deflection

with

the

VOLTS/

DIV

switch

set

the

position

POSITION



The

control

that

vertically

positions

the

trace

display

IDENTIFY



Momentary

contact,

push-button

switch,

concentric

with

POSITION

Will

cause

the

trace,

representing

the

output

the

Type

7A22,

move

small

amount

when

pressed

Aids

identifying

the

Type

7A22

trace

when

multiple

traces

are displayed

HIGH



Nine

position

switch

select

the

ap-

FREQUENCY



proximate

high

frequency

----3

point

----3

POINT

The

switch

positions

are

100 Hz,

300

Hz,

kHz,

kHz, 10 kHz,

kHz, 100

kHz,

300

kHz,

and

MHz

LOW



Eight

position

switch

select

coupl-

FREQUENCY



ing

the

approximate

low

frequency

-3

dB POINT



----3

points

The

switch positions are

OFFSET,

DC,

Hz,



Hz,

100 Hz,

kHz,

and

kHz

INPUT

WAVEFORM

AC-GND-DC

Type

7A22

Signal

input

connector

Positive

input

produces

deflection

upward

(see

Fig

2-1)

Signal input

connector

Positive

input

produces

deflection

downward

(see

Fig

2-1)

Fig

2-1

Signals

applied

the

+INPUT

connector

produces

upright

display,

while

signals

applied

the

--INPUT

are

inverted

miniature

illuminated

push-button

type

switch

The

buttons

are

interlocked

that only

one

button

may

depressed

one

time

When

the

'AC'

button

depressed

the signal

coupled

through

.1'cF

the

Input

Amplifier

and

only

the

varying

component

the

input

sig-

nal

amplified

When

the

'DC'

button

depressed

the

signal

coupled

directly

the

Input

Amplifier

and

the

entire

input

signal,

both

and DC,

amplified

When

the

'GND'

button

(or

none

the

but-

tons)

depressed,

the signal

coupled

through 0

al`

and

through

M52

ground

The

Amplifier

Input

grounded

this

condition

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