Tektronix T921 User manual

Tektronix,

Inc

Box500

Beaverton,

Oregon

97077

070-1982-01

TEKTRONIX

T921

/T922/T922

MHz

OSCILLOSCOPES

WITH

OPTIONS

INSTRUCTION

MANUAL

Serial

Number

First

Printing

JULY

1975

WARRANTY

All

TEKTRONIX

instruments

are

warranted

against de-

fective

materials

and

workmanship

for

one

year

Any

questions

with

respect

the

warranty

should

taken

with

your

TEKTRONIX

Field

Engineer

representative

All

requests

for

repairs

and

replacement

parts

should

directed

the

TEKTRONIX

Field

Office

representative

your

area

This

will

assure

you

the

fastest

possible

service

Please include the instrument

Type

Number

Part

Number

and

Serial

Number

with

all

requests

for

parts

service

Specifications

and

price

change

privileges

reserved

1975,

1976 by

Tektronix,

Inc

Beaverton,

Oregon

Printed

the United

States

America

All

rights

reserved

Contents

this

publication

may

not

reproduced

any

form

without

permission

Tektronix,

Inc

.S .A

and

foreign

TEKTRONIX

products

covered

and

foreign

patents

and/or

patents

pending

TEKTRONIX

registered

trademark

Tektronix,

Inc

REV

JUL

1977

TABLE

CONTENTS

T921/T922/T922R

Page

THE

FOLLOWING

SERVICING

INSTRUCTIONS

AREFOR

QUALIFIED

SERVICE

PERSONNEL

LIST

ILLUSTRATIONS

ONLY

SECTION

ADJUSTMENTS

Page

LIST

TABLES

III

Limits

and

Tolerances

4-1

Adjustment

Interaction

4-1

Partial

Procedures

4-1

Test

Equipment

Required

4-1

Preliminary

Procedure

4-2

SECTION

SPECIFICATIONS

Display

and

Power

Supply 4-4

Electrical

1-1

Vertical

Amplifier

4-6

Environmental

1-3

Time

Base

4-10

Physical

1-3

Standard

Accessories

1-5

SECTION

SERVICE

INFORMATION

Recommended

Accessories

1-6

Cabinet

Removal

5-1

Preventive

Maintenance

5-1

Troubleshooting

5-2

Corrective

Maintenance

5-10

SECTION

OPERATING

INSTRUCTIONS

T922R

Line

Voltage

and

Range

Operating

Voltage

2-1

Selection

5-21

Safety

Information

2-1

Repackaging

For

Shipment

5-21

Function

Controls,

Connectors

and

Indicators,

T921

and

T922

SECTION

ELECTRICAL

REPLACEABLEPARTS

Display

2-1

Vertical

Amplifier

2-3

OPTIONS

Time Base

2-5

SECTION

CIRCUIT

DESCRIPTION

AND

DIAGRAMS

Function

Controls,

Connectors

and

Indicators,

T922R

Block

Diagram

Display 2-7

CRT

and

Vertical

Amplifier

Vertical

Amplifier

2-8

Power

Supply

Time Base

2-8

Vertical

Input

(T921)

First

Time

Operation

2-10

Vertical

Input

(T922)

Probe

Compensation

2-13

Vertical

Switching

(T922)

Applications

2-13

Trigger

(Late)

T922R

Rackmounting

2-17

Trigger

(Early)

Sweep

Horizontal Amplifier

T922R

Single

Sweep,

Buffer,

Axis

T922R

Scale

Illum,

+32

V P

Vert

Out,

SECTION

PERFORMANCE

CHECK

F&R

T922R

Circuit

Board

Interconnections

Limits

and

Tolerances

3-1

Test

Equipment

Required

3-1

SECTION

MECHANICAL

REPLACEABLEPARTS

Preliminary

Procedure

3-2

Performance

Check

Procedure

3-3

CHANGE

INFORMATION

T921/T922/T922R

LIST

ILLUSTRATIONS

REV

JUNE

1976

Fig

Description

Page

Fig

Description

Page

1-1

T921/T922/T922R

MHz

oscilloscopes

Frontis

4-1

T922R

adjustment

locations

4-3

1-2

T922R

dimensional

drawing

1-4

4-2

Power

supply

adjustment

location

1-3

T921/T922

dimensional

drawing

1-5

(bottom

T921

and

T922)

4-4

2-1

Display

front

panel

controls

and

4-3

Interface

board

adjustment

locations

4-5

connectors

2-2 4-4

Vertical

amplifier

adjustment

locations

2-2

Rear

panel

controls

and

connectors

2-3

(bottom

view

T921

and

T922)

4-7

2-3

Left

side

of cabinet

2-4 4-5 Display

correct

(idealized)

attenuator

2-4

Bottom

cabinet

2-4

compensation

4-8

2-5

Vertical

amplifier

front

panel

controls

2-5 4-6

Time

base

adjustment

locations

4-11

2-6

Time

base

front

panel

controls

and

connectors

2-6

5-1

Troubleshooting

chart

5-4

2-7

T922R

display

controls,

connectors,

and

5-2

Color

code

for

resistors

and

capacitors

5-6

indicators

2-7

5-3

Lead

configuration

for

semiconductor

2-8

T922R

vertical

amplifier controls,

devices

5-7

connectors

and

indicators

2-9 5-4

Multi-cohnector

holder

orientation

5-8

2-9

T922R

time

base

controls,

connectors

5-5

connector

replacement

5-12

and

indicators

2-10 5-6

Shaft-knob

removal

5-13

2-10

Probe

compensation

2-14 5-7

T921

and

T922

circuit

board

locations

5-13

2-11

Effects

probe

compensation

2-14 5-8

T921

and

T922

circuit

board

locations

5-15

2-12

Peak-to-peak

voltage

measurement

2-15 5-9

T922R

circuit

board

locations

5-17

2-13

Instantaneous

voltage

measurement

2-15 5-10

T922R

vertical

module

replacement

5-18

2-14

Phase

difference

2-16

5-11

T922R

horizontal

module

replacement

5-18

2-15

Time

duration

2-16

5-12

T922R

interface

board

replacement

5-19

2-16 Risetime

2-17

5-13

T922Rpowermodule

replacement

5-19

2-17

T922R

rackmounting

methods

2-19 5-14

T922R

scale

illum

assembly

3-1

Deflection

accuracy

and

gain

check

replacement

5-20

test

setup

3-3

5-15

T922R

line-voltage

and

range

selection

5-21

3-2

T922R

rear

input

test

setup

3-4

3-3

Bandwidth

check

test

setup

3-6

7-1

Foldback

circuit

action

3-4 Triggering

and

Z-axis

input

check

test

7-2

Timing

diagram

sweep

generatorand

gate

setup

3-7 7-3

Timing

diagram

signals

generated

3-5

Timing

accuracy

check

test

setup

3-8

during

single-sweep

display

3-6

SWEEP

RAMP

OUT

display

3-10 7-4

Bench

version

T922+33voltpowersupply

3-7

SWEEP

GATE

OUT

display

3-10

7-5

Simplified

block

diagram

the

vertical

3-8

trigger

check

test

setup

3-11

output

amplifier

circuit

LIST

TABLES

T921/T922/T922R

Table

Title

Page

1-1

Electrical

Characteristics

1-1

1-2

Environmental

Characteristics

1-3

Physical Characteristics

1-3

3-1

Test

Equipment

3-1

3-2 Deflection

Accuracy

3-3

Normal

Sweep

Timing

Accuracy

3-9

3-4

Magnified

Sweep

Timing

Accuracy

3-9

4-1

Test

Equipment

4-1

5-1

Power

Supply

Tolerance

5-3

7-1

Attenuator

and

Gain

Switching

Sequence

7-2

Attenuator

and

Gain

Switching

T921

/T922/T922R

Fig

1-1

T921/T922/T922

MHz

oscilloscopes

REV

JUNE

197

This

manual

includes

instructions for

the

T921,

T922

and

T922R

portable

oscilloscopes

The

T922

MHz,

dual

trace,

oscilloscope

and

the

T921

a 15

MHz,

single

trace

oscilloscope

The

Vertical

Amplifier,

either

single

trace

dual

trace,

provides

calibrated

deflection

factors

from

to 10

V/div

The

TimeBase

provides

stable

triggering

over

the

full

bandwidth

the

Vertical

Amplifier(s)

and

provides

calibrated

sweep

rates

from

s/div

Ns/div

variable

X10

magnifier

extends

the

maximum

sweep

rate

ns/div

The

T992R

rackmount

verison

the

T922

os-

cilloscope

which

takes

5-1/4

inches

rack

space

Characterist

Probe

Adjust

Output

Voltage

(0°Cto

+40°

Repetition

Rate

Z-Axis Input

Sensitivity

Signal

Polarity

T921

and

T922

T922R

REV

APR

1977

PerformanceRequirement

DISPLAY

Approximately

kHz

volt

signal

causes

noticeable

decrease

intensity

Positive

going

from

ground

Either polarity of

signal

can

applied,

depending

upon

internal

jumper

connections

SPECIFICATIONS

TABLE

1-1

Electrical

Features

added

the

rackmount

version

include

single

sweep

;

rear

panel

outputs

for

Sweep

Gate,

Sweep

Ramp,

and

Vertical

Signal

;

internally

selectable

Axis

polarity

;

user

selection

the

CHOP

ALT

dual

trace

modes

;

and

switch-selectable

front-panel

rear-panel

inputs for

and

EXT

TRIG

signals

The

following

instrument

specifications

apply

over an

ambient temperature

range

0°C

+45°C

unless

otherwise

specified

The

Adjustment

Procedure

Section

when

performed

completely,

allows

the

T921/T922/

T922R

meet

the

electrical

specifications

listed

Table

1-1

Characteristic

Line

Frequency



60 Hz

Maximum

Power

Consumption

CRT

Display

Area

Trace

Rotation

Range

Standard

Phosphor

Nominal

Accel-

erating

Potential

Section

1-T921/T922/T922R

36 W,

.35

60 Hz,

120

line

8 x 10

Adequate

align

trace

with

horizontal

center

line

P31

PerformanceRequirement

12,400

VERTICAL

AMPLIFIER

Usable

Frequency

Range

MHz

Deflection

Factor

Maximum

Input

(dc

peak

ac)

p-p

Range

mV/div

V/div

;12steps

Voltage

kHz

or less

2-5

sequence

Input

Impedance

Approximately

kit

Accuracy

Power

Source (T922R

120

V-240

Range

and

Line

Voltage

HI-LO

adjustments

are not

exter-

+20°

Within

Ranges

(ac,rms)

nally

accessible)

+30°

120

Range HI-108

132

+45

Within

LO-90

110

Uncalibrated

Continuously

variable

between

240

Range HI-216

250

(VAR)

Range

settings

Extends

deflection

factor

LO-198

242

to at

least

V/div

(at

least

:1)

Specifications-T921

/T9~2/T922R

Chara

cteristic



Performance

Requirement

VERTICAL

AMPLIFI

(co

nt)

TABLE

1-1

(cont)

Characteristic

Sweep

Rate

Calibrated

Range

Accuracy

+20°

+30°

X-Y

Operation

Unmagnified

Magnified

+45°

Unmagnified

Magnified

Variable

Magnifier

Deflection

Factor

Variable

Magnifier

X10

X-Axis

Bandwidth

T921

T922

T922R

Input

Resistance

Input

Capacitance

T921

&T922

T922R

Phase

Difference

Between

X-

and

Y-Axis

Amplifiers

TIME

BASE

s/div

.2,us/div

;

20 steps

1-2-5

sequence

Variable

X10

magnifier

extends

maximum

sweep

rate to

ns/div

Accuracy

specification

applies

over center

divisions

Exclude

first

sweep

for

both

magnified

and

unmagnified

sweep

rates

and

anything

beyond

the

100th

magnified

division

Within

PerformanceRequirement

Approximately

100 mV/div

Approximately

V/div

least

MHz

with 10

div

reference

signal

least

MHz

with

div

reference

signal

Approximately

Approxiamtely

30 pF

Approximately

40 pF

(front

input

only)

5°

less

from

kHz

REV

DEC

197

Frequency

Response

Bandwidth

least

MHz

division

reference

signal

centered

vertical-

from

a 25

source

with

VOLTS/DIV

VAR

control

calibrated detent)

Risetime 23 ns

less

ChoppedMode

Approximately

250

kHz

Repetition

Rate

(T922)

Input

Resistance

Approximately

Input

Capacitance

Approximately

30 pF

(T921

and

T922)

Input

Capacitance

(

T922R

)

and

Approximately

(front

only)

Maximum

Input

Voltage

Coupled

400

(dc

peak

ac)

800

(p-p

ac)

kHz

less

Coupled

400

(dc

peak

ac)

800

(p-p

ac)

kHz

less

Vertical

Output

(T922R)

Amplitude

High

Im- At

least

.5V/div

display

pedance

Load

Approximately

mV/div

dis-

play

Bandwidth

Approximately

MHz

acteristic

Performance

Requirement

REV

DEC

197

TABLE

1-1 (cont)

TIME

BASE

(cont)

TABLE

1-2

Environmental

Characteristic

Altitude

Storage

Operating

Specifications-T921

/T922/T922R

TABLE

1-2 (cont)

PerformanceRequirement

50,000

15,000

Maximum

operating

temperature

decreases 1°C/1,000

above

5,000

TABLE

1-3

Physical

Triggering

Sensitivity

div

internal

100

external

from

MHz,

increasing

div

internal

150

external

MHz

Sync

Composite

sync

div

internal

100

external

(approximately

div

230

composite

video)

External

Trigger Input

Maximum

Input

400

(dc

peak

ac)

Voltage

800

(p-p

ac)

kHz

less)

Input

Resistance

Approximately

Mfg

Input

Capacitance Approximately

30 pF

(T921

and

T922)

Input

Capacitance

Approximately

40 pF

(T922R,

front

only)

Level

Range

EXT

-0

EXT

Characteristic

PerformanceRequirement

Weight

T921

and

T922

With

Panel

Ibs

kg)

Cover,

Accessories

and

Accessory

Pouch

Without

Panel

lbs

kg)

Cover,

Accessories

and

Accessory

Pouch

T922R

Without

Ibs

kg)

Accessories

Domestic

Ibs

(15

kg)

Shipping

Overall

Dimensions

(T921

and

T922)

Refer

Fig

1-3

Overall

Dimensions

(T922R)

Refer

Fig

1-2

Characteristic

Temperature

Storage

Performance

Requirement

-55

+75

Operating

T921

T922

0°

+45°

T922R

0°

+50°

Specifications-T921

/T922/T922R

Fig

1-2

T922R

dimensional

drawing

REV

DEC

197

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