Tektronix 7853a User manual

TEKTRO

N

IX®

7

B

53A/7B53AN

DUAL

TIME

BASE

OPERATORS

INSTRUCTION

MANUAL

Tektronix,

Inc.

070-1252-00

P.O.

Box

500

Beaverton,

Oregon

97005

772

WARRANTY

Ait

T

E

KTRONIX

instru ents are warranted

against

defective aterials and

w

o

r

k anship

for one

year.

Any

questions

with

respect to

the

warrant

y should be

taken

up

with your

TEKTRONIX

Field

Engine

eer or representative.

A

ll r

equests

for

repairs and

replace ent

parts

should

b

e

directed

to

the

TEKTRONIX Fiield Office or representati

ve

in

your

area

.

This

will

assure

you

the fastest

possible

service. Please

include

the

instru ent

Type

Nu ber

or

Part

Nu ber

and

Serial

Nu ber

with

all

request

s for parts or service.

Specification

s

and

price

change

privileges

reserved.

Copyright

©

1972

by

Tektronix,

Inc.,

Beaverton,

Oregon.

Printed

in

the

United

States

of

A erica.

All

rights

reserved.

Contents

of

this

publication

ay

not

be

reproduced

in

any

for

without

per ission

of

Tektronix,

Inc.

U.S.A,

an

d

foreign

TEKTRONIX

products

covered

by

U.S.

and

foreign

patents

and/or

patents

pending.

TEKTRONIX

is

a

registered

trade ark

of

Tektronix,

Inc.

7B53A/7B53AN

Operators

TABLE

OF

CONTENTS

Page

SECTION

I

OPERATING

INSTRUCTIONS

Page

SECTION

I

OPERATING

INSTRUCTIONS

(cont)

7B53A/7B53AN

Features

1-1

General

1-1

Installation

1-1

Controls

and

Connectors

1

-3

Main

Triggering

Controls

1-3

Sweep

Controls

1-4

Delay

Ti e

Control

1-4

Delayed

Triggering

Controls

1-4

Input/Output

Connectors

1-4

Operating

Checkout

1-4

Introduction

1-4

Setup

Procedure

1-4

Sweep

Control

Functions

1-5

Sweep

Calibration

(front-panel)

1-5

Main

and

Delayed

Triggering

Functions

1-6

General

Operating

Instructions

1-7

Pushbutton

Switch

Logic

1-7

Triggered

Light

1-7

Main

Trigger

Mode

1-7

Main

Triggering

Coupling

1-8

Main

Triggering

Source

1-9

Trigger

Slope

1-9

Trigger

Level

1-11

Selecting

Sweep

Rates

1-11

Ti e

Measure ent

1-12

Sweep

Magnifier

1-12

Display

Modes

1-13

Delay

Ti e

Multiplier

1-13

Delayed

Sweep

Triggering

1-14

Input/Output

Connectors

1-14

X-Y

Operation

1-14

Mainfra e

Operating

Modes

1-15

Applications

1-15

General

1-15

Co parison

Measure ent

Techniques

1-15

Ti e

Duration

Measure ents

1-16

Deter ining

Frequency

1-16

Riseti e

Measure ents

1-17

Delayed

Sweep

Measure ents

1-18

Delayed

Sweep

Magnification

1-18

Triggered

Delayed

Sweep

Magnification

1-20

Displaying

Co plex

Signals

Using

Delayed

Sweep

1-20

Pulse

Jitter

Measure ents

1-21

SECTION

II

SPECIFICATION

Table

2-1,

Electrical

2-1

Main

Sweep

2-1

Delayed

Sweep

2-1

Mixed

Sweep,

Variable

Ti e

Delay

2-2

A plifier

2-2

Main

Triggering

2-3

Delayed

Triggering

2-4

Output

Signals

2-4

Table

2-2,

Environ ental

2-5

Table

2-3,

Physical

2-5

NOTE

Refer

to

the

7B53A/7B53AN

Service

Manual

for

circuit

description,

maintenance,

cali ration,

diagrams,

and

parts

replacement

information.

Fig.

1-1.

7B53A

and

7B53AN

Dual

Ti e

Base

Units.

7B53A/7B53AN

Operators

Section

1-7B53A/7B53AN

OPERATING

INSTRUCTIONS

7B53A/7B53AN

Feat res

The

7B53A

and

7B53AN

D al

Time

Base

nits

provide

Main,

Intensified,

Delayed,

and

Mixed

sweep

operation

for

TEKTRONIX

7000Series

Oscilloscopes.

Calibrated

sweep

rates

from

5

s/DIV

to

50

ns/DIV

(5

nanoseconds

with

X10

magnification)

and

triggering

to

100

megahertz

are

provided.

The

7B53A

and

7B53AN

are

electrically

identical

except

that

only

the

7B53A

is

compatible

with

the

alphan meric

reado t

system

provided

for

7000-Series

Oscilloscopes.

Before

proceeding

with

installation

it

is

necessary

to

check

the

settings

of

the

Variable

Selector

m lti-pin

connector

(P140)

and

the

Delayed

Sweep

Gate

O t

m lti-pin

connector

(P613).

The

Variable

Selector

m lti



connector

(P140)

determines

whether

the

front-panel

VARIABLE

control

varies

main

sweep

rates,

delayed

sweep

rates,

or

main

sweep

holdoff;

the

Delayed

Sweep)

Gate

O t

m lti-pin

connector

(P613)

determines

whether

the

Delayed

Sweep

Gate

O t

signal

is

connected

to

the

front-panel

DLY'D

TRIG

IN

connector

(see

Fig.

1-3).

Refer

to

General

Operating

Instr ctions

in

this

section

for

VARIABLE

control

and

DLY'D

GATE

OUT

information.

Other

feat res

incl de

0

to

10

times

contin o s

sweep

delay,

variable

main

and

delayed

sweep

rates,

and

variable

main

sweep

holdoff.

Separate

triggering

controls

are

provided

for

main

and

delayed

sweep

triggering,

and

when

operating

in

the

AUTO

MAIN

TRIGGERING

MODE,

a

bright

base

line

is

displayed

in

the

absence

of

a

trigger

signal.

The

7B53A/7B53AN

can

also

be

sed

as

an

amplifier

for

X-Y

operation.

To

install

the

7B53A/7B53AN

in

a

pl g-in

compart



ment,

p sh

it

in

ntil

it

fits

firmly

into

the

compartment.

The

front

panel

of

the

7B53A/7B53AN

sho ld

be

fl sh

with

the

front

panel

of

the

indicator

oscilloscope.

Even

tho gh

the

gain

of

the

indicator

oscilloscope

is

standardized

to

minimize

adj stment

when

inserting

pl g-in

nits,

the

sweep

calibration

of

the

7B53A/7B53AN

sho ld

be

checked

when

installed.

The

proced re

for

checking

the

nit

is

given

nder

Sweep

Calibration

in

the

Operating

Checko t

proced re

in

this

section.

General

The

7B53A/7B53AN

operates

with

a

TEKTRONIX

7000-Series

Oscilloscope

and

a

7A-Series

Amplifier

nit

to

form

a

complete

oscilloscope

system.

To

effectively

se

the

7B53A/7B53AN

its

operation

and

capabilities

sho ld

be

known.

This

section

describes

the

operation

of

the

front



panel

controls

and

connectors,

provides

an

Operating

Checko t

proced re,

gives

general

operating

information,

and

basic

applications

for

this

instr ment.

Installation

The

7B53A/7B53AN

is

designed

to

operate

in

the

horizontal

compartment

of

the

indicator

oscilloscope.

This

instr ment

can

also

be

installed

in

the

Vertical

pl g-in

compartment

to

provide

a

sweep

that

r ns

vertically

on

the

CRT.

However,

when

sed

in

this

manner,

there

are

no

retrace

blanking

or

internal

triggering

provisions,

and

the

nit

may

not

meet

the

specifications

given

in

Section

2.

The

instr ctions

in

this

man al

are

written

for

se

of

the

7B53A/7B53AN

in

the

horizontal

pl g-in

compartment.

To

remove

the

7B53A/7B53AN,

p ll

the

release

latch

(see

Fig.

1-2)

to

disengage

the

nit

from

the

indicator

oscilloscope

and

p ll

it

o t

of

the

pl g-in

compartment.

Fig.

1-2.

Location

of

release

latch.

1-1

Operating

Instructions

—

7B53A/7B53AN

Operators

Variable

Selector

Connector

(P140)

Right

Side

Of

Instru ent

Variable

Delayed

Sweep

Rates

Variable

Main

Sweep

Rates

Variable

Main

Sweep

Holdoff

Delayed

Gate

Out

Connector

(P613)

Delayed

Gate

Out

Signal

Connected

.

to

DLY'D

TRIG

IN

Connector

(P613)

Left

Side

Of

Instru ent

Fig.

1-3.

Location

of

Delayed

Gate

Out

and

Variable

Selector

ulti-pin

connectors.

REV.

APR

1974

®I

1-2

Operating

Instructions

—

7B53A/7B53AN

Operators

Fig.

1-4.

Front-panel

controls

and

connectors.

CONTROLS

AND

CONNECTORS

General

All

controls

req ired

for

the

operation

of

the

7B53A/

7B53AN,

except

the

Variable

Selector

and

the

Dly'd

Sweep

Gate

O t

connector

(see

Fig.

1-3),

are

located

on

the

front

panel

of

the

instr ment.

To

make

f ll

se

of

the

capabilities

of

this

instr ment,

the

operator

sho ld

be

familiar

with

the

f nction

and

se

of

each

control.

A

brief

description

of

the

front-panel

controls

and

connectors

is

given

here.

More

detailed

information

is

given

nder

General

Operating

Information.

Fig.

1-4

shows

the

front

panel

and

external

controls

and

connectors

of

the

7B53A/7B53AN.

SLOPE.

Two-position

switch

permits

triggering

on

the

positive-going

or

negative-going

portion

of

the

main

trig



gering

signal.

TRIG'D.

Light

indicates

that

the

main

sweep

is

triggered

and

will

prod ce

a

display.

MODE.

P shb tton

switches

select

the

operating

mode

for

the

main

triggering

circ its.

COUPLING.

P shb tton

switches

select

the

method

of

co pling

the

triggering

signal

to

the

main

triggering

circ its.

1.

Main

Triggering

Controls

LEVEL.

Selects

the

amplit de

point

on

the

trigger

signal

where

sweep

triggering

occ rs.

SOURCE.

P shb tton

switches

select

the

so rce

of

the

main

triggering

signal.

13

Operating

Instructions

—

7B53A/7B53AN

Operators

2.

Sweep

Controls

TIME/DIV

OR

DLY

TIME.

Selects

the

sweep

rate

of

the

main

sweep

generator

(see

Fig.

1-7).

DLY'D

Time/Division.

Selects

the

sweep

rate

of

the

delayed

sweep

generator

and

selects

the

MAIN

SWP,

INTEN,

and

DLY'D

SWP

Display

Modes

(see

Fig.

1-7).

VARIABLE.

Provides

contin o sly

variable

main

sweep

rates,

contin o sly

variable

delayed

sweep

rates,

or

variable

main

sweep

holdoff;

depending

on

the

setting

of

the

Variable

Selector

m lti-pin

connector

(P140).

The

VARI



ABLE

control

also

selects

the

MIXED

Display

Mode

(see

Fig.

1-3,

Fig.

1-7).

SWP

CAL.

Screwdriver

adj stment

to

match

the

gain

of

the

7B53A/7B53AN

to

the

indicator

oscilloscope

for

calibrated

sweep

rates.

POSITION.

Controls

horizontal

position

of

display.

FINE.

Provides

precise

control

of

horizontal

position

adj stment.

MAG.

P shb tton

switch

selects

X1

or

X10

horizontal

magnification.

3.

Delay

Time

Control

DELAY

TIME

MULT.

Provides

variable

sweep

delay

between

0.00

and

10.0

times

the

delay

time

indicated

by

the

TIME/DIV

OR

DLY

TIME

switch.

4.

Delayed

Triggering

Controls

LEVEL.

Selects

the

RUNS

AFTER

DLY

TIME

or

Triggerable

After

Dly

Time

Modes,

and

the

amplit de

point

at

which

the

delayed

sweep

is

triggered.

SLOPE.

Two-position

switch

permits

triggering

on

the

positive-going

or

negative-going

portion

of

the

delayed

triggering

signal.

COUPLING.

Two-position

switch

selects

the

method

of

co pling

the

triggering

signal

to

the

delayed

triggering

circ its.

SOURCE.

Two-position

switch

to

select

the

so rce

of

the

delayed

triggering

signal.

5.

Inp t/O tp t

Connectors

MAIN

TRIG

IN

OR

AMP

IN.

Front-panel

BNC

connec



tor

serving

as

an

external

trigger

inp t

for

the

main

triggering

circ it

or

as

an

external

horizontal

inp t,

depending

pon

the

setting

of

the

TIME/DIV

OR

DLY

TIME

switch

and

the

MAIN

TRIGGERING

SOURCE

switch.

DLY'D

TRIG

IN.

Front-panel

BNC

connector

serving

as

an

external

trigger

inp t

for

the

delayed

triggering

circ its

or

as

a

delayed

sweep

gate

o tp t;

depending

pon

the

DLY'D

TRIG

SOURCE

switch,

the

position

of

P613,

and

the

DISPLAY

MODE.

OPERATING

CHECKOUT

Introd ction

The

following

proced re

checks

the

basic

operation

of

the

7B53A/7B53AN.

It

may

also

be

sed

for

familiarization

with

this

instr ment

or

as

an

incoming

inspection.

This

proced re

is

divided

into

two

parts.

Sweep

Control

F nctions,

and

Main

and

Delayed

Triggering

F nctions.

A

complete

operating

check

of

the

7B53A/7B53AN

control

f nctions

can

be

made

by

performing

both

parts,

or

each

part

may

be

performed

separately.

NOTE

For

optimum

performance,

the

7B53A/7B53AN

should

e

installed

in

an

oscilloscope

system

with

similar

frequency

and

sweep

rate

capa ilities.

Set p

Proced re

1.

Install

the

7B53A/7B53AN

in

the

right

horizontal

compartment

of

the

indicator

oscilloscope.

2.

Install

a

Vertical

Amplifier

nit

in

the

left

vertical

compartment.

3.

T rn

on

the

indicator

oscilloscope

and

allow

at

least

20

min tes

warm p.

4.

Set

the

7B53A/7B53AN

controls

as

follows:

MAIN

TRIGGERING

SLOPE

(+)

MODE

AUTO

COUPLING

AC

SOURCE

INT

1-4

Operating

Instructions

—

7B53A/7B53AN

Operators

DLY'D

TRIG

LEVEL

SLOPE

COUPLING

SOURCE

Sweep

Controls

POSITION

MAG

TIME/DIV

OR

DLY

TIM

DLY'D

Time/Division

VARIABLE

Variable

Selector

DELAY

TIME

MULT

RUNS

AFTER

DLY

TIME

(f lly

clockwise)

(+)

AC

INT

Midrange

X1-IN

1

ms

1

ms

CAL

(f lly

clockwise)

Main

Variable

1.00

5.

Set

the

indicator

oscilloscope

to

display

the

pl g-in

nits

and

adj st

for

a

well

defined

display.

See

indicator

oscilloscope

and

vertical

nit

instr ction

man als

for

detailed

operating

instr ctions.

5.

Rotate

the

POSITION

control

and

note

that

it

horizontally

positions

the

trace.

Rotate

the

FINE

control

and

note

that

it

provides

precise

horizontal

positioning.

Disconnect

the

calibrator

signal.

Sweep

Calibration

NOTE

For

accurate

sweep

timing,

apply

a

signai

of

known

frequency

or

time

period

(time-mark

signal,

cali rator

square

wave,

60

hertz

line

etc.)

to

the

associated

vertical

amplifier

unit

and

adjust

the

TIME/DIV

OR

DLY

TIME

switch

and

the

SWP

CAL

control

to

cali rate

the

signal

to

the

oscilloscope

graticule.

Be

sure

that

the

sweep

timing

signal

is

accurate

within

0.5%.

The

following

sweep

cali ration

procedure

uses

a

TEKTRONIX

Time-Mark

Generator.

Sweep

Control

F nctions

The

following

proced re

checks

the

operation

of

the

sweep

controls

and

checks

the

Display

Modes.

Normal

Sweep

1.

Perform

steps

one

thro gh

five

of

the

Set p

Proced re.

6.

Connect

a

1

millisecond

time-mark

signal

from

the

Time-Mark

Generator

with

a

50-ohm

BNC

coaxial

cable

and

50-ohm

BNC

termination

to

the

Inp t

of

the

associated

vertical

nit.

Adj st

the

vertical

Volts/Div

switch

for

abo t

fo r

divisions

of

display

and

rotate

the

MAIN

TRIG



GERING

LEVEL

control

for

a

stable

display.

Check

the

CRT

display

for

one

complete

time-mark

per

division

(position

as

necessary).

If

necessary,

adj st

the

SWP

CAL

screwdriver

adj stment

for

one

complete

time-mark

per

division

over

the

center

eight

divisions

of

display.

Dis



connect

the

Time-Mark

Generator.

NOTE

The

Time/Division

switch

selects

main

sweep

rates,

delayed

sweep

rates,

and

Display

Modes

(MAIN

SWP,

INTEN,

DLY'D

SWP,

and

MIXED).

Refer

to

Selecting

Sweep

Rates

and

Display

Modes

discussions

in

the

General

Operating

Instructions

for

further

information.

2.

To

select

the

MAIN

SWP

Display

Mode,

press

in

the

DLY'D

Time/Division

knob,

and

set

the

TIME/DIV

OR

DLY

TIME

switch

and

the

DLY'D

Time/Division

switch

to

the

same

sweep

rate

(1

ms).

3.

Connect

the

one-kilohertz

calibrator

signal

from

the

indicator

oscilloscope

to

the

vertical

amplifier

nit

Inp t.

Adj st

the

Calibrator

and

the

vertical

Volts/Division

switch

for

fo r

divisions

of

display.

4.

Rotate

the

MAIN

TRIGGERING

LEVEL

control

for

a

stable

MAIN

SWP

display

(non-delayed).

Rotate

the

DELAY

TIME

MULT

dial

and

note

that

it

has

no

effect

on

the

display.

Intensified,

Delayed,

and

Mixed

Sweep

7.

Reconnect

the

oscilloscope

Calibrator

signal

to

the

vertical

nit

and

adj st

for

abo t

fo r

divisions

of

vertical

display.

P ll

o t

the

DLY'D

Time/Division

knob

and

rotate

clockwise

to

.1

ms/DIV

for

the

INTEN

Display

Mode

(TIME/DIV

OR

DLY

TIME

switch

remains

at

1

ms/DIV).

Note

that

a

delaying

sweep

with

an

intensified

portion

(delayed

sweep)

is

displayed

on

the

CRT

(the

oscilloscope

Intensity

may

need

to

be

varied

to

view

the

intensified

display).

8.

Rotate

the

DELAY

TIME

MULT

dial

and

note

that

the

amo nt

of

delay

time

before

the

intensified

portion

of

display

is

controlled

by

the

DELAY

TIME

MULT

dial.

9.

Rotate

the

VARIABLE

control

co nterclockwise

o t

of

switch

detent

and

note

that

the

sweep

rate

indicated

by

the

TIME/DIV

OR

DLY

TIME

switch

can

be

varied

to

at

least

the

sweep

rate

of

the

position

(2

ms/DIV).

The

internal

Variable

Selector

connector

m st

be

set

for

variable

main

sweep

rates.

Ret rn

the

VARIABLE

control

to

the

CAL

position.

1-5

Operating

lnstructions

—

7B53A/7B53AN

Operators

10.

Press

the

DLY'D

Time/Division

switch

to

the

inner

position

for

the

DLY'D

SWP

Display

Mode.

Note

the

magnified

display

with

sweep

rate

determined

by

the

DLY'D

Time/Division

switch.

The

oscilloscope

Intensity

may

need

to

be

increased

to

view

the

delayed

sweep

display.

11.

P ll

o t

the

VARIABLE

Time/Division

knob

for

the

MIXED

Display

Mode

(MIXED

Display

Mode

can

be

selected

when

operating

in

the

DLY'D

SWP

Display

Mode

only).

Note

that

the

main

sweep

is

displayed

at

a

rate

determined

by

the

TIME/DIV

OR

DLY

TIME

switch

followed

by

a

delayed

sweep

display

at

the

rate

determined

by

the

DLY'D

Time/Division

switch.

Rotate

the

DELAY

TIME

MULT

dial

and

note

that

the

amo nt

of

display

allocated

to

each

sweep

is

determined

by

the

DELAY

TIME

MULT

dial.

Main

and

Delayed

Sweep

Triggering

F nctions

The

following

proced re

checks

the

operation

of

the

main

and

delayed

triggering

controls:

Partial

Procedure.

To

begin

the

Operating

Checko t

with

triggering,

perform

steps

1

thro gh

5

of

the

Set p

Proced re

provided

at

the

beginning

of

the

Operating

Checko t.

Connect

the

1

-kilohertz

calibrator

signal

from

the

indicator

oscilloscope

to

the

vertical

nit

Inp t

and

adj st

for

abo t

fo r

divisions

of

vertical

display.

12.

Set

the

TIME/DIV

OR

DLY

TIME

switch

and

the

DLY'D

Time/Division

switch

to

1

ms

and

press

in

the

DLY'D

Time/Division

switch

and

the

Variable

control.

CHECK

—

that

a

stable

display

can

be

obtained

with

the

COUPLING

switch

for

MAIN

TRIGGERING

set

to

AC,

AC

HF

RE

J,

and

DC

for

both

the

positive

and

negative

positions

of

the

SLOPE

switch

(MAIN

TRIGGERING

LEVEL

control

may

be

adj sted

as

necessary

to

obtain

a

stable

main

sweep

display).

Remove

all

connections

from

the

oscilloscope

system.

13.

Connect

a

60

hertz

signal

(line

voltage,

etc.)

with

a

50-ohm

cable

or

voltage

probe

to

the

vertical

nit

Inp t

and

adj st

the

Volts/Div

switch

for

abo t

fo r

divisions

of

display.

Set

the

MAIN

TRIGGERING

COUPLING

switch

to

AC

LF

REJ

and

set

the

TIME/DIV

OR

DLY

TIME

switch

to

10

ms.

Rotate

the

MAIN

TRIGGERING

LEVEL

control

thro gho t

its

range

and

check

that

a

stable

display

cannot

be

obtained

(TRIG'D

light

off).

14.

Change

the

MAIN

TRIGGERING

SOURCE

switch

to

LINE

and

the

COUPLING

switch

to

AC.

Check

that

a

stable

main

sweep

display

can

be

obtained

with

the

MAIN

TRIGGERING

COUPLING

switch

set

to

AC,

AC

HF

REJ,

and

DC

(MAIN

TRIGGERING

LEVEL

control

may

be

adj sted

as

necessary).

Remove

all

connections

from

the

oscilloscope

system.

15.

Connect

the

indicator

oscilloscope

Calibrator

signal

to

the

vertical

nit

Inp t

connector

and

to

the

MAIN

TRIG

IN

connector.

Set

the

Calibrator

for

a

0.4

volt,

1

kilohertz

signal

and

adj st

the

vertical

nit

Volts/Div

switch

for

abo t

fo r

divisions

of

display.

Set

the

TIME/DIV

OR

DLY

TIME

switch

and

the

DLY'D

Time/Division

switch

to

1

ms.

Set

the

MAIN

TRIGGERING

SOURCE

switch

to

EXT

and

check

that

a

stable

display

can

be

obtained

with

the

COUPLING

switch

for

MAIN

TRIGGERING

set

to

AC,

AC

HF

REJ,

and

DC,

for

both

the

positive

and

negative

positions

of

the

SLOPE

switch

(MAIN

TRIGGERING

LEVEL

control

may

be

adj sted

as

necessary

for

a

stable

display).

16.

Change

the

MAIN

TRIGGERING

SOURCE

switch

to

EXT

-r

10.

Set

the

oscilloscope

Calibrator

for

4

volts

at

1

kilohertz

and

adj st

the

vertical

nit

Volts/Div

switch

for

abo t

4

divisions

of

display.

Check

that

a

stable

display

can

be

obtained

with

the

COUPLING

switch

for

MAIN

TRIGGERING

set

to

AC,

AC

HF

REJ,

and

DC,

for

both

the

positive

and

negative

positions

of

the

SLOPE

switch

(MAIN

TRIGGERING

LEVEL

control

may

be

adj sted

as

necessary

to

obtain

a

stable

delaying

sweep

display).

Remove

the

Calibrator

signal

from

the

MAIN

TRIG

IN

connector.

17.

Set

the

MAIN

TRIGGERING

COUPLING

switch

to

AC

and

the

SOURCE

switch

to

INT.

Adj st

the

MAIN

TRIGGERING

LEVEL

control

for

a

stable

display.

Set

the

MODE

switch

to

NORM

and

check

for

a

stable

display.

Change

the

MODE

switch

to

AUTO

and

adj st

the

LEVEL

control

for

a

free-r nning

display.

Change

the

MODE

switch

to

NORM

and

check

for

no

display.

18.

Adj st

the

MAIN

TRIGGERING

LEVEL

control

for

a

stable

display.

Change

the

MAIN

TRIGGERING

MODE

switch

to

SINGLE

SWP.

Press

the

RESET

b tton

and

check

for

one

sweep.

Remove

the

1

kilohertz

signal

from

the

vertical

nit

and

press

the

RESET

b tton.

CHECK

for

no

display

and

that

the

READY

light

is

on.

Connect

the

1

kilohertz

signal

to

the

vertical

nit

and

check

for

one

sweep

as

the

signal

is

applied.

19.

Set

the

MAIN

TRIGGERING

MODE

switch

to

AUTO.

With

theTIME/DIV

OR

DLY

TIME

switch

at

1

ms,

p ll

o t

the

DLY'D

Time/Division

switch

and

rotate

to

.2

ms

(Intensified

Display

Mode).

Rotate

the

MAIN

TRIG



GERING

LEVEL

control

for

a

stable

display

(oscilloscope

Intensity

may

need

to

be

varied

to

view

the

intensified

display).

Rotate

the

DELAY

TIME

MULT

dial

and

note

that

the

intensified

portion

of

display

is

contin o sly

variable.

1-6

Operating

lnstructions

—

7B53A/7B53AN

Operators

20.

Rotate

the

DLY'D

TRIG

LEVEL

control

co nter



clockwise

o t

of

switch

detent

for

a

triggered

delayed

sweep.

With

the

DLY'D

TRIG

SLOPE,

COUPLING,

and

SOURCE

switches

set

to

(+),

AC,

and

INT;

rotate

the

DLY'D

TRIG

LEVEL

control

for

a

stable

intensified

portion

of

display.

Rotate

the

DELAY

TIME

MULT

dial

and

note

that

the

intensified

portion

of

display

does

not

start

at

the

completion

of

the

delay

time

(determined

by

the

settings

of

the

TIME/DIV

OR

DLY

TIME

switch

and

the

DELAY

TIME

MULT

dial),

b t

waits

for

the

p lse.

21.

Press

the

DLY'D

Time/Division

switch

in

for

the

DLY'D

SWP

Display

Mode.

Rotate

the

DLY'D

TRIG

LEVEL

control

for

a

stable

delayed

sweep

display

(oscillo



scope

Intensity

may

need

to

be

varied).

Check

that

a

stable

delayed

sweep

display

can

be

obtained

with

the

DLY'D

TRIG

COUPLING

switch

set

to

AC

and

DC

for

both

+

and

-

positions

of

the

SLOPE

switch

(DLY'D

TRIG

LEVEL

control

may

be

adj sted

as

necessary

for

a

stable

delayed

sweep

display).

22.

Change

the

DLY'D

TRIG

SOURCE

switch

to

EXT.

Connect

the

indicator

oscilloscope

Calibrator

signal

to

the

DLY'D

TRIG

IN

connector.

Set

the

oscilloscope

Calibrator

for

0.4

volt

at

1

kilohertz

and

adj st

the

vertical

Volts/

Division

switch

for

abo t

4

divisions

of

display.

Check

that

a

stable

delayed

sweep

display

can

be

obtained

with

the

DLY'D

TRIG

COUPLING

switch

set

to

AC

and

DC

for

both

the

+

and

-

positions

of

the

SLOPE

switch

(DLY'D

TRIG

LEVEL

control

may

be

adj sted

as

necessary

for

a

stable

delayed

sweep

display).

GENERAL

OPERATING

INSTRUCTIONS

P shb tton

Switch

Logic

The

MODE,

COUPLING,

and

SOURCE

p shb ttons

of

the

MAIN

TRIGGERING

switches

are

arranged

in

a

seq ence

which

places

the

most-often

sed

position

at

the

top

of

each

series

of

p shb ttons.

With

this

arrangement,

a

stable

display

can

s ally

be

obtained

by

pressing

the

top

p shb ttons:

AUTO,

AC,

and

INT.

When

an

adeq ate

trigger

signal

is

applied,

the

nit

is

triggered

as

indicated

by

the

ill minated

TRIG'D

light,

with

the

correct

setting

of

the

LEVEL

control

and

SLOPE

switch.

If

the

TRIG'D

light

is

not

on,

the

LEVEL

control

is

at

a

setting

o tside

the

range

of

the

trigger

signal

applied

to

this

nit

from

the

vertical

nit,

the

trigger

signal

is

inadeq ate,

or

its

freq ency

is

below

the

lower

freq ency

limit

of

the

AC

COUPLING

switch

position.

If

the

desired

display

is

not

obtained

with

these

b ttons

p shed

in,

other

selections

m st

be

made.

Refer

to

the

following

disc ssions

or

the

instr ction

man als

for

the

associated

oscilloscope

and

vertical

nit

for

more

information.

Triggered

Light

The

TRIG'D

light

conveniently

indicates

the

condition

of

the

triggering

circ its.

If

the

MAIN

TRIGGERING

controls

are

correctly

set

and

an

adeq ate

trigger

signal

is

applied,

the

TRIG'D

light

is

on.

Under

certain

conditions,

the

TRIG'D

light

may

be

off,

indicating

that

the

sweep

is

not

triggered.

The

ca se

co ld

be

a

misadj sted

LEVEL

control,

incorrectly

set

COUPLING

or

SOURCE

switches,

low

trigger

signal

amplit de,

or

a

triggering

signal

repetition

rate

o tside

the

acceptable

freq ency

range.

This

light

can

be

sed

as

a

general

indication

of

correct

triggering.

It

is

partic larly

sef l

when

setting

p

the

trigger

circ its

when

a

triggering

signal

is

available

witho t

a

display

on

the

CRT.

Main

Trigger

Mode

The

p shb ttons

located

nder

the

MODE

title

select

the

mode

in

which

the

main

sweep

is

triggered.

AUTO.

When

the

AUTO

p shb tton

is

pressed,

a

triggered

display

is

presented

whenever

an

adeq ate

trigger

signal

is

applied

and

the

LEVEL

control

and

SLOPE

switch

are

correctly

set.

The

TRIG'D

light

indicates

when

the

display

is

triggered.

When

the

trigger

repetition

rate

is

below

abo t

30

hertz,

o tside

the

freq ency

range

selected

by

the

COUPLING

switch,

or

when

the

trigger

signal

is

inadeq ate,

the

sweep

free-r ns

at

the

sweep

rate

indicated

by

the

TIME/DIV

or

DLY

TIME

switch

(TRIG'D

light

off).

When

an

adeq ate

trigger

signal

is

again

applied,

the

free-r nning

condition

ends

and

a

triggered

display

is

presented.

The

sweep

also

free-r ns

when

the

LEVEL

control

is

at

a

setting

o tside

the

amplit de

range

of

the

trigger

signal.

This

type

of

free-r nning

display

can

be

sef l

when

it

is

desired

to

meas re

only

the

maxim m

peak-to-peak

amplit de

of

a

signal

witho t

observing

the

waveshape

(s ch

as

in

band



width

meas rements).

When

the

display

is

of

a

m ch

greater

amplit de

than

can

be

displayed

on

the

CRT,

the

sweep

will

be

triggered

in

all

positions

of

the

LEVEL

control

and

will

not

free-r n.

NORM.

When

the

NORM

p shb tton

is

pressed,

a

triggered

display

is

presented

with

the

correct

setting

of

the

LEVEL

control

and

SLOPE

switch

whenever

an

adeq ate

trigger

signal

is

applied.

The

TRIG'D

light

indicates

when

the

display

is

triggered.

The

NORM

trigger

mode

m st

be

sed

to

prod ce

triggered

displays

with

trigger

repetition

rates

below

abo t

30

hertz.

When

the

LEVEL

control

is

at

a

setting

o tside

the

amplit de

range

of

the

trigger

signal,

when

the

trigger

repetition

rate

is

o tside

the

freq ency

range

selected

by

the

COUPLING

switch,

or

when

the

trigger

signal

is

inadeq ate,

there

is

no

trace

(TRIG'D

light

is

off).

1-7

Operating

Instructions

—

7B53A/7B53AN

Operators

SINGLE

SWEEP,

RESET-READY.

When

the

signal

to

be

displayed

is

not

repetitive

or

varies

in

amplit de,

waveshape,

or

repetition

rate,

a

conventional

repetitive

type

display

may

prod ce

an

nstable

presentation.

A

stable

display

can

often

be

obtained

nder

these

circ mstances

by

sing

the

SINGLE

SWP

feat re

of

this

nit.

The

SINGLE

SWP

MODE

is

also

sef l

to

photograph

non-repetitive

or

nstable

displays.

To

obtain

a

single-sweep

display

of

a

repetition

signal,

first

obtain

the

best

possible

display

in

the

NORM

MODE.

Then

witho t

changing

the

other

MAIN

TRIGGERING

switches,

press

the

SINGLE

SWEEP

p shb tton.

When

ready

to

view

the

single-sweep

display,

press

the

RESET



READY

p shb tton.

A

single

trace

is

presented

each

time

the

RESET-READY

p shb tton

is

pressed

(as

long

as

the

repetitive

signal

remains

connected

to

the

system

and

MAIN

TRIGGERING

switches

are

correctly

set);

f rther

sweeps

cannot

be

presented

ntil

the

RESET-READY

p shb tton

is

pressed

again.

If

the

display

signal

is

a

complex

waveform

composed

of

varying

amplit de,

s ccessive

single-sweep

displays

may

not

start

at

the

same

point

on

the

waveform.

To

avoid

conf sion

d e

to

the

CRT

persistence,

allow

the

display

to

disappear

before

pressing

the

RESET-READY

p shb tton

again.

At

fast

sweep

rates,

it

may

be

diffic lt

to

view

the

single-sweep

display.

The

apparent

trace

intensity

can

be

increased

by

red cing

the

ambient

light

level

or

sing

a

viewing

hood

as

recommended

in

the

indicator

oscilloscope

instr ction

man al.

Non-repetitive,

random

signals

can

be

displayed

in

the

SINGLE

SWP

MODE

by

first

obtaining

the

best

possible

display

in

the

NORM

MODE

with

a

signal

which

is

abo t

the

same

amplit de

and

freq ency

as

the

random

signal.

Then

witho t

changing

the

other

MAIN

TRIGGERING

controls,

press

the

SINGLE

SWP

p shb tton.

When

ready

for

the

random

signal,

press

the

RESET-READY

p sh



b tton.

The

RESET-READY

p shb tton

remains

ill mi



nated

to

indicate

that

the

nit

has

been

reset

and

is

ready

to

prod ce

a

sweep.

The

light

goes

o t

after

the

single

sweep

has

been

displayed.

To

prepare

the

nit

for

another

single-sweep

display,

press

the

RESET-READY

p shb tton.

When

sing

the

SINGLE

SWP

MODE

to

photograph

waveforms,

t rn

off

the

gratic le

ill mination

while

the

trace

is

being

photographed.

Then

the

gratic le

can

be

photographed

later

to

prod ce

a

do ble-expos re

pict re

showing

complete

information.

F rther

information

on

photographic

techniq e

is

given

in

the

appropriate

camera

instr ction

man al.

Main

Triggering

Co pling

The

MAIN

TRIGGERING

p shb ttons

located

below

the

COUPLING

title

select

the

method

in

which

the

trigger

signal

is

connected

to

the

trigger

circ its.

Each

position

permits

selection

or

rejection

of

the

freq ency

components

of

the

trigger

signal

which

trigger

the

sweep.

Fig.

1-5

graphically

ill strates

the

band

of

freq encies

covered

by

each

position

of

the

COUPLING

switch.

Fig.

1-5.

Frequency

range

of

each

COUPLING

switch

position.

1-8

Operating

Instructions

—

7B53A/7B53AN

Operators

AC.

In

the

AC

position

of

the

COUPLING

switch,

the

DC

component

of

the

trigger

signal

is

blocked.

Signals

with

low-freq ency

components

below

abo t

30

hertz

are

atten ated.

In

general,

AC

COUPLING

can

be

sed

for

most

applications.

However,

if

the

signal

contains

nwanted

freq ency

components

or

if

the

sweep

is

to

be

triggered

at

a

low

repetition

rate

or

DC

level,

one

of

the

remaining

COUPLING

switch

positions

will

provide

a

better

display.

The

triggering

point

in

the

AC

position

of

the

COUPLING

switch

depends

pon

the

average

voltage

level

of

the

trigger

signal.

If

the

trigger

signal

occ rs

randomly,

the

average

voltage

level

will

vary,

ca sing

the

triggering

point

to

vary

also.

This

shift

of

the

triggering

point

may

make

it

impossible

to

maintain

a

stable

display.

In

s ch

cases,

se

DC

COUPLING.

AC

LF

REJ.

In

the

AC

LF

REJ

position

of

the

COUPLING

switch,

DC

is

rejected

and

low-freq ency

trigger

signals

below

abo t

30

kilohertz

are

atten ated.

Therefore,

the

sweep

is

triggered

only

by

the

higher-

freq ency

components

of

the

trigger

signal.

This

position

is

partic larly

sef l

for

providing

stable

triggering

if

the

trigger

signal

contains

line-freq ency

components.

Also,

the

AC

LF

REJ

position

provides

the

best

alternate

vertical

displays

at

fast

sweep

rates

when

comparing

two

or

more

nrelated

signals.

AC

HF

REJ.

The

AC

HF

REJ

position

of

the

COUPLING

switch

passes

all

low-freq ency

signals

between

abo t

30

hertz

and

50

kilohertz.

DC

is

rejected

and

signals

o tside

the

above

range

are

atten ated.

When

triggering

from

complex

waveforms,

this

position

is

sef l

to

provide

a

stable

display

of

the

low-freq ency

components.

DC.

The

DC

position

of

the

COUPLING

switch

can

be

sed

to

provide

stable

triggering

with

low-freq ency

signals

which

wo ld

be

atten ated

in

the

other

modes,

or

with

low-repetition

rate

signals.

It

can

also

be

sed

to

trigger

the

sweep

when

the

trigger

signal

reaches

a

DC

level

selected

by

the

setting

of

the

LEVEL

control.

When

sing

internal

triggering,

the

setting

of

the

vertical

nit

position

control

affects

the

DC

triggering

point.

Main

Triggering

So rce

The

MAIN

TRIGGERING

p shb tton

located

below

the

SOU

RCE

title

select

the

so rce

of

the

trigger

signal

which

is

connected

to

the

main

triggering

circ its.

INT.

In

the

INT

position

of

the

SOURCE

switch,

the

trigger

signal

is

derived

from

the

associated

vertical

nit.

F rther

selection

of

the

internal

trigger

signal

may

be

provided

by

the

associated

vertical

nit

or

indicator

oscilloscope;

see

the

instr ction

man als

for

these

instr



ments

for

information.

For

most

applications,

the

INT

position

of

the

SOURCE

switch

can

be

sed.

However,

some

applications

req ire

special

triggering

which

cannot

be

obtained

in

the

INT

position

of

the

SOURCE

switch.

In

s ch

cases

the

LINE

or

EXT

positions

of

the

SOURCE

switch

m st

be

sed.

LINE.

The

LINE

position

of

the

SOURCE

switch

connects

a

sample

of

the

power-line

voltage

from

the

indicator

oscilloscope

to

the

trigger

circ it.

Line

triggering

is

sef l

when

the

inp t

signal

is

time-related

(m ltiple

or

s bm ltiple)

to

the

line

freq ency.

It

is

also

sef l

for

providing

a

stable

display

of

a

line-freq ency

component

in

a

complex

waveform.

EXT.

An

external

signal

connected

to

the

MAIN

TRIG

IN

connector

can

be

sed

to

trigger

the

sweep

in

the

EXT

position

of

the

SOURCE

switch.

The

external

signal

m st

be

time-related

to

the

displayed

waveform

for

a

stable

display.

An

external

trigger

signal

can

provide

a

triggered

display

when

the

internal

signal

is

too

low

in

amplit de

for

correct

triggering,

or

contains

signal

components

on

which

it

is

not

desired

to

trigger.

It

is

also

sef l

when

signal

tracing

in

amplifiers,

phase

shift

networks,

waveshaping

circ its,

etc.

The

signal

from

a

single

point

in

the

circ it

nder

test

can

be

connected

to

the

EXT

TRIG

IN

connector

with

a

probe

or

cable.

The

sweep

is

then

triggered

by

the

same

signal

at

all

times

and

allows

amplit de,

time

relationship,

or

waveshape

changes

of

signals

at

vario s

points

in

the

circ it

to

be

examined

witho t

resetting

the

MAIN

TRIGGERING

controls.

EXT

4-

10.

Operation

in

the

EXT

4-

10

position

of

the

SOURCE

switch

is

the

same

as

described

for

EXT

except

that

the

external

signal

is

atten ated

10

times.

Atten ation

of

high-amplit de

external

trigger

signals

is

desirable

to

broaden

the

range

of

the

LEVEL

control.

Trigger

Slope

The

MAIN

TRIGGERING

SLOPE

switch

(concentric

with

the

MAIN

TRIGGERING

LEVEL

control)

determines

whether

the

trigger

circ it

responds

on

the

positive-going

or

negative-going

portion

of

the

trigger

signal.

When

the

SLOPE

switch

is

in

the

+

position,

the

display

starts

on

the

positive-going

portion

of

the

waveform;

in

the

-

position,

the

display

starts

with

the

negative-going

portion

of

the

waveform

(see

Fig.

1-6).

When

several

cycles

of

a

signal

appear

in

a

display,

the

setting

of

the

SLOPE

switch

is

often

nimportant.

However,

if

only

a

certain

portion

of

a

cycle

is

to

be

displayed,

correct

setting

of

the

SLOPE

switch

is

important

to

provide

a

display

which

starts

on

the

desired

slope

of

the

inp t

signal.

1-9

Operating

Instructions

—

7B53A/7B53AN

Operators

Fig.

1-6.

Effect

of

LEVEL

control

and

SLOPE

switch

on

CRT

display.

1-10

Operating

Instr ctions

—

7B53A/7B53AN

Operators

Fig.

1-7.

Co posite

Ti e/Division

switch.

Trigger

Level

The

MAIN

TRIGGER

LEVEL

control

determines

the

voltage

level

on

the

trigger

signal

at

which

the

sweep

is

triggered.

When

the

LEVEL

control

is

set

in

the

+

region,

the

trigger

circ it

responds

at

a

more

positive

point

on

the

trigger

signal.

When

the

LEVEL

control

is

set

in

the

—

region,

the

trigger

circ it

responds

at

a

more

negative

point

on

the

trigger

signal.

Fig.

1-6

ill strates

this

effect

with

different

settings

of

the

SLOPE

switch.

Before

setting

the

MAIN

TRIGGERING

LEVEL,

set

the

desired

SLOPE,

MODE,

COUPLING,

and

SOURCE.

Set

the

LEVEL

control

f lly

co nterclockwise

and

then

rotate

clockwise

ntil

the

display

starts

at

the

desired

point.

Selecting

Sweep

Rates

The

TIME/DIV

OR

DLY

TIME

switch

selects

calibrated

sweep

rates

for

the

main

sweep

generator

and

the

DLY'D

Time/Division

switch

selects

calibrated

sweep

rates

for

the

delayed

sweep

generator.

The

sweep

rate

of

the

main

sweep

generator

is

bracketed

by

the

black

lines

on

the

clear

plastic

flange

of

the

TIME/DIV

OR

DLY

TIME

switch

(see

Fig.

1-7).

The

sweep

rate

of

the

delayed

sweep

generator

is

indicated

by

the

white

line

on

the

DLY'D

Time/Division

knob.

When

the

TIME/DIV

OR

DLY

TIME

switch

and

the

DLY'D

Time/Division

switch

are

set

to

the

same

sweep

rate,

the

switches

lock

together

and

the

sweep

rate

of

both

generators

are

changed

at

the

same

time.

However,

when

the

DLY

’

D

Time/Division

knob

is

p lled

o tward,

the

clear

plastic

flange

is

disengaged

and

only

the

delayed

sweep

generator

sweep

rate

is

changed.

This

allows

changing

the

delayed

sweep

rate

witho t

changing

the

delay

time

determined

by

the

main

sweep

generator.

The

DLY'D

Time/Division

switch

also

selects

Display

Modes.

See

Display

Mode

disc ssion

in

this

section

for

f rther

informa



tion.

A

VARIABLE

control

is

provided

concentric

with

the

TIME/DIV

OR

DLY

TIME

and

the

DLY'D

Time/Division

switches

(see

Fig.

1-7).

When

the

VARIABLE

control

is

rotated

clockwise

to

the

CAL

position

(into

switch

detent)

the

variable

f nction

is

inoperative

and

the

VARIABLE

knob

can

be

sed

only

to

select

the

MIXED

Display

Mode

(see

Display

Mode

disc ssion

in

this

section

for

more

infor



mation).

However,

when

rotated

co nterclockwise

(o t

of

switch

detent),

the

VARIABLE

control

is

activated

for

variable

( ncalibrated)

main

sweep

rates,

delayed

sweep

rates,

or

main

sweep

holdoff;

depending

pon

the

setting

of

the

Variable

Selector

m lti-pin

connector

(see

Fig.

1-3).

The

VARIABLE

control

allows

the

sweep

rate

in

each

Time/Division

switch

position

(main

or

delayed)

to

be

red ced

to

at

least

the

switch

position

and

the

holdoff

time

to

be

increased

2:1.

REV.

APR

1974

1-11

Operating

Instr ctions

—

7B53A/7B53AN

Operators

Fig.

1-8.

Area

of

graticule

used

for

accurate

ti e

easure ents.

Time

Meas rement

When

making

time

meas rements

from

the

gratic le,

the

center

eight

divisions

provide

the

most

linear

time

meas re



ments

(see

Fig.

1-8).

Position

the

start

of

the

timing

area

to

the

second

vertical

line

and

adj st

the

TIME/DIV

OR

DLY

TIME

switch

so

the

end

of

the

timing

area

falls

between

the

second

and

tenth

vertical

lines.

Sweep

Magnifier

The

sweep

magnifier

can

be

sed

to

expand

the

display

ten

times.

The

center

division

of

the

nmagnified

display

is

the

portion

visible

on

the

CRT

in

the

magnified

form

(see

Fig.

1-9).

Eq ivalent

length

of

the

magnified

sweep

is

more

than

100

divisions;

any

10

division

portion

can

be

viewed

by

adj sting

the

POSITION

control

to

bring

the

desired

portion

onto

the

viewing

area.

To

se

the

MAG

switch,

first

move

the

portion

of

the

display

which

is

to

be

expanded

to

the

center

of

the

gratic le.

Then

press

and

release

the

MAG

switch

to

the

OUT

—

X10

position.

When

the

MAG

switch

is

in

the

X10

position,

the

eq ivalent

magnified

sweep

rate

can

be

determined

by

dividing

the

Time/Division

setting

by

10.

For

example,

if

the

TIME/DIV

OR

DLY

TIME

switch

is

set

to

1

ms

the

eq ivalent

sweep

rate

is

100

µs.

When

operating

in

the

INTEN,

DLY'D

SWP,

or

MIXED

Display

Modes

the

delayed

sweep

rate

as

well

as

the

main

sweep

rate

is

increased

10

times.

Fig.

1-9.

Operation

of

Sweep

Magnifier.

Fig.

1-10.

(A)

Intensified

Sweep

display;

(B)

Delayed

Sweep

display.

1-12

Operating

Instr ctions

—

7B53A/7B53AN

Operators

Display

Modes

Fo r

Display

Modes

can

be

selected

by

appropriate

settings

of

the

Time/Division

switches

(see

Fig.

1-7).

Main

Sweep

Operation.

To

select

the

MAIN

SWP

Display

Mode

(non-delayed

sweep)

set

the

TIME/DIV

OR

DLY

TIME

and

DLY'D

Time/Division

switches

to

the

same

sweep

rate

and

press

in

the

DLY'D

Time/Division

switch.

Calibrated

sweep

rates

in

the

MAIN

SWP

Display

Mode

are

available

from

5

s/DIV

to

0.05

µs/DIV

(5

ns/DIV

with

X

10

magnification).

The

VARIABLE

control

(Variable

Selector

connector

set

to

Main

Variable)

can

be

sed

to

obtain

ncalibrated

sweep

rates

to

12.5

seconds/division.

Trig



gering

in

the

MAIN

SWP

Display

Mode

is

controlled

by

the

MAIN

TRIGGER

controls.

Intensified

Sweep

Display.

To

select

the

INTEN

Display

Mode,

p ll

o t

the

DLY'D

Time/Division

knob

and

rotate

it

to

a

desired

sweep

rate

faster

than

the

TIME/DIV

OR

DLY

TIME

switch

setting.

The

INTEN

Display

Mode

provides

an

intensified

portion

of

the

main

sweep

d ring

the

time

the

delayed

sweep

is

in

operation

(see

Fig.

1-10A).

The

time

that

the

delayed

sweep

r ns

is

determined

by

the

DLY'D

Time/Division

switch.

The

amo nt

of

delay

time

between

the

start

of

the

delaying

sweep

and

the

intensified

portion

is

determined

by

the

TIME/DIV

OR

DLY

TIME

switch

and

the

DELAY

TIME

MULT

dial.

Triggering

for

the

delaying

sweep

portion

of

display

is

controlled

by

the

MAIN

TRIGGERING

controls;

triggering

for

the

intensified

portion

of

display

is

controlled

by

the

DLY'D

TRIG

controls.

Delayed

Sweep

Display.

The

DLY

’

D

SWP

Display

Mode

is

selected

when

the

DLY'D

Time/Division

switch

is

p lled

o t,

rotated

in

the

INTEN

Mode

for

the

desired

sweep

rate,

and

then

p shed

in.

In

this

mode,

the

intensified

portion

of

display,

as

viewed

in

the

INTEN

Display

Mode,

is

displayed

on

the

CRT

at

the

sweep

rate

indicated

by

the

DLY'D

Time/Division

switch

(see

Fig.

1-10B).

Calibrated

sweep

rates

in

the

DLY'D

SWP

Display

Mode

are

available

from

.5

s/DIV

to

0.05

µs/DIV.

Uncalibrated

delayed

sweep

rates

to

1.25

seconds/division

can

be

obtained

by

sing

the

VARI



ABLE

control

(Variable

Selector

connector

set

to

Dly'd

Variable

position).

Triggering

for

the

DLY'D

SWP

display

is

controlled

by

the

DLY'D

TRIG

controls.

Mixed

Sweep

Operation.

The

MIXED

Display

Mode

is

selected

when

the

DLY'D

SWP

Display

Mode

is

selected

and

the

VARIABLE

knob

is

p lled

o t.

In

this

mode,

the

main

sweep

is

displayed

on

the

CRT

to

a

point

determined

by

the

DELAY

TIME

MULT

dial;

the

remainder

of

the

sweep

is

at

a

rate

determined

by

the

delayed

sweep.

Triggering

for

the

main

sweep

portion

of

display

is

controlled

by

the

MAIN

TRIGGERING

controls;

and

triggering

for

the

delayed

sweep

portion

of

display

is

controlled

by

the

DLY'D

TRIG

controls.

A

typical

mixed

sweep

display

is

shown

in

Fig.

1-11.

Delay

Time

M ltiplier

The

DELAY

TIME

MULT

dial

(f nctional

in

the

INTEN,

DLY'D

SWP,

and

MIXED

Display

Modes)

provides

0

to

10

times

contin o s

sweep

delay.

The

time

that

the

main

sweep

r ns

before

the

start

of

the

delayed

sweep

is

determined

by

the

settings

of

the

TIME/DIV

OR

DLY

TIME

switch

and

the

DELAY

TIME

MULT

dial.

For

example,

the

delay

time

indicated

by

the

DELAY

TIME

MULT

dial

in

Fig.

1-12

is

3.55;

this

corresponds

to

3.55

CRT

divisions

of

main

sweep.

Th s

3.55

m ltiplied

by

the

delaying

sweep

rate,

indicated

by

the

TIME/DIV

OR

DLY

TIME

switch,

gives

the

calibrated

delay

time

before

the

start

of

the

delayed

sweep.

Fig.

1-11.

Typical

Mixed

Sweep

display

(DELAY

TIME

MULT

dial

set

to

3.55).

1-13

Operating

Instructions

—

7B53A/7B53AN

Operators

Delayed

Sweep

Triggering

A

LEVEL

control

and

SLOPE,

COUPLING,

and

SOURCE

switches

are

provided

for

delayed

sweep

trig



gering.

When

the

LEVEL

control

is

rotated

to

the

RUNS

AFTER

DLY

TIME

position

the

delayed

sweep

starts

immediately

after

the

delay

time.

The

DLY'D

TRIG

LEVEL

control

and

the

SLOPE,

COUPLING,

and

SOURCE

switches

are

inoperative.

This

mode

permits

the

selection

of

contin o sly

variable

delay

times

(by

varying

the

DELAY

TIME

MULT

dial).

DLY'D

TRIG

IN.

This

connector

is

an

external

inp t

for

the

delayed

triggering

circ it

when

the

DLY'D

TRIG

SOURCE

switch

is

set

to

EXT.

When

the

DLY'D

TRIG

SOURCE

switch

is

set

to

INT

and

P613

is

properly

connected

(see

Fig.

1-3),

the

DLY'D

TRIG

IN

connector

serves

as

a

Delayed

Sweep

Gate

O t

connector

(not

labeled).

The

Delayed

Sweep

Gate

signal

is

a

rectang lar

positive-going

p lse

with

approximately

3.0

volts

amplit de

and

p lse

width

coincident

with

the

delayed

sweep.

When

the

DLY'D

TRIG

LEVEL

control

is

rotated

co nterclockwise

(o t

of

switch

detent),

the

delayed

sweep

is

triggerable.

The

delayed

sweep

does

not

start

at

the

completion

of

the

delay

time

b t,

waits

ntil

a

trigger

p lse

is

received

by

the

delayed

sweep

triggering

circ it.

The

delay

time

in

this

mode

is

dependent

not

only

on

the

settings

of

the

delay-time

controls,

b t

on

the

delayed

sweep

triggering

controls

and

the

occ rrence

of

the

delayed

sweep

triggering

signal.

The

primary

p rpose

of

this

mode

is

to

eliminate

jitter

from

the

display

delayed

sweep

wave



form.

Since

the

delayed

sweep

is

triggered

by

the

inp t

waveform,

jitter

is

eliminated

from

the

delayed

sweep

display

even

tho gh

it

may

be

inherent

in

the

inp t

waveform

.

When

the

delayed

sweep

is

triggerable,

the

LEVEL

control

can

be

rotated

to

select

the

amplit de

point

on

the

trigger

signal

at

which

the

delayed

sweep

is

triggered.

The

DLY'D

TRIG

SLOPE,

COUPLING,

and

SOURCE

switches

are

activated

and

their

f nctions

are

the

same

for

delayed

triggering

as

f nctions

with

the

same

title

are

for

MAIN

TRIGGERING

(see

Main

Triggering

Level,

Slope,

Co pling,

and

So rce

disc ssions

in

this

section).

Inp t/O tp t

Connectors

Two

d al-f nction

BNC

connectors

are

provided

on

the

instr ment

front-panel.

MAIN

TRIG

IN

OR

AMP

IN.

This

connector

is

an

external

trigger

inp t

for

the

main

triggering

circ it

when

the

MAIN

TRIGGERING

SOURCE

switch

is

set

to

EXT

or

EXT

÷

10

and

the

TIME/DIV

OR

DLY

TIME

switch

is

set

to

any

position

except

AMPL.

When

the

TIME/DIV

OR

DLY

TIME

switch

is

set

to

AMPL

and

the

MAIN

TRIGGERING

SOURCE

switch

is

set

to

EXT

or

EXT

÷

10,

this

connector

serves

as

an

external

horizontal

inp t

(see

X-Y

Operation).

X-Y

Operation

Some

applications

req ire

one

signal

displayed

vers s

another

rather

than

against

time

(internal

sweep).

The

amplifier

f nction

of

the

7B53A/7B53AN

allows

an

external

signal

to

be

applied

to

the

horizontal

deflection

system

either

externally

via

the

MAIN

TRIG

IN

OR

AMP

IN

connector

or

internally

by

way

of

the

triggering

system.

To

apply

an

external

signal

(X-signal)

to

the

horizontal

system,

set

the

7B53A/7B53AN

TIME/DIV

OR

DLY

TIME

switch

to

AMPL

and

the

MAIN

TRIGGERING

SOURCE

switch

to

EXT.

The

MAIN

TRIGGERING

COUPLING

selected

affects

the

freq ency

response

of

the

X-signal.

Apply

the

external

signal

to

the

MAIN

TRIG

IN

OR

AMP

IN

connector.

Deflection

factor

of

the

X-signal

is

provided

in

m ltiples

of

10

as

shown

in

Table

1-1.

The

Y-signal

can

be

applied

to

the

pl g-in

nit

installed

in

the

vertical

compartment.

TABLE

1-1

MAIN

TRIGGERING

COUPLING

MAG

DEFLECTION

FACTOR

(within

10%)

EXT

X

10

mV/div

EXT

X1

100

mV/div

EXT:

10

X

1 1

V/div

To

apply

the

X-signal

internally

via

the

triggering

system

set

the

TIME/DIV

OR

DLY

TIME

switch

to

AMPL

and

the

MAIN

TRIGGERING

SOURCE

switch

to

INT.

Apply

the

external

signal

to

the

Amplifier

nit

installed

in

the

vertical

compartment.

The

atten ator

switch

of

the

Amplifier

nit

determines

the

horizontal

deflection

factor.

For

information

on

X-Y

applications

see

the

oscilloscope

man al.

Also,

the

reference

books

listed

nder

Applications

provide

information

on

X-Y

meas rements

and

interpreting

the

res ltant

lissajo s

displays.

1-14

Operating

lnstructions~7B53A/7B53AN

Operators

Mainframe

Operating

Modes

The

7B53A/7B53AN

can

be

operated

in

a

7000-Series

Oscilloscope

which

has

fo r

pl g-in

compartments,

either

independently,

in

the

Alternate

or

Chopped

Horizontal

Modes,

or

as

a

delayed

sweep

nit.

However,

when

the

7B53A/7B53AN

is

operated

as

a

delayed

sweep

nit,

it

m st

be

triggered

for

a

CRT

display.

It

cannot

delay

another

time

base

nit

b t

it

can

delay

its

own

internal

delayed

sweep.

Refer

to

the

appropriate

oscilloscope

man al

for

additional

mainframe

horizontal

operating

information.

APPLICATIONS

General

The

following

information

describes

the

proced re

and

techniq es

for

making

basic

meas rements

with

a

7B53A/

7B53AN

installed

in

a

7000-Series

Oscilloscope.

These

applications

are

not

described

in

detail,

since

each

applica



tion

m st

be

adapted

to

the

req irements

of

the

individ al

meas rement.

This

instr ment

can

also

be

sed

for

many

applications

not

described

in

this

man al.

Contact

yo r

local

TEKTRONIX

Field

Office

or

representative

for

assistance

in

making

specific

meas rements.

The

following

books

describe

oscilloscope

meas rement

techniq es

which

can

be

adapted

for

se

with

this

instr ment.

J.

Czech,

"Oscilloscope

Meas ring

Techniq es",

Phillips

Technical

Library,

Springer-Verlag,

New

York,

1965.

2.

Set

the

TIME/DIV

OR

DL'Y

TIME

switch

and

the

VARIABLE

control

(Variable

Selector

connector

set

to

Main

Variable)

so

one

cycle

of

the

signal

covers

an

exact

n mber

of

horizontal

divisions.

Do

not

change

the

VARIABLE

control

after

obtaining

the

desired

deflection.

This

display

can

be

sed

as

a

reference

for

freq ency

comparison

meas rements.

3.

To

establish

an

arbitrary

sweep

rate

so

the

period

(time

for

one

complete

cycle)

of

an

nknown

signal

can

be

meas red

acc rately

at

any

setting

of

the

TIME/DIV

OR

DLY

TIME

switch,

the

period

of

the

reference

signal

m st

be

known.

If

it

is

not

known,

it

can

be

meas red

before

the

VARIABLE

switch

is

set

in

step

2.

4.

Divide

the

period

of

the

reference

signal

(seconds)

by

the

prod ct

of

the

horizontal

deflection

established

in

step

2

(division)

and

the

setting

of

the

TIME/DIV

OR

DLY

TIME

switch.

This

is

the

horizontal

conversion

factor:

Horizontal

Conversion

=

Factor

reference

signal

period

(seconds)

horizontal

TIME/DIV

OR

deflection

X

DLY

TIME

(divisions)

switch

setting

5.

To

meas re

the

period

of

an

nknown

signal

dis



connect

the

reference

signal

and

connect

the

nknown

signal

to

the

vertical

nit.

Set

the

TIME/DIV

OR

DLY

TIME

switch

to

a

setting

that

provides

s fficient

horizontal

deflection

to

make

an

acc rate

meas rement.

Do

not

readj st

the

VARIABLE

control.

John

D.

Lenk,

"Handbook

of

Oscilloscope

Theory

and

Applications",

Prentice-

Hall,

Inc.

Englewood

Cliffs,

N.J.,

1968.

Charles

H.

Roth,

Jr.,

"Use

of

the

Oscilloscope",

Programmed

Text,

Prentice-Hall,

Inc.,

Englewood

Cliffs,

N.J.

1970.

6.

Meas re

the

horizontal

deflection

in

divisions

and

calc late

the

period

of

the

nknown

signal

sing

the

following

form la:

Period

(Seconds)

J.

H.

Golding,

"Meas ring

Oscilloscope",

Trans



atlantic,

1971.

TIME/DIV

OR

DLY

TIME

setting

horizontal

X

conversion

X

factor

horizontal

deflection

(divisions)

Comparison

Meas rement

Techniq es

Sweep

Rates.

To

establish

an

arbitrary

horizontal

sweep

rate

based

pon

a

specific

reference

freq ency

proceed

as

follows:

1.

Connect

the

reference

signal

to

the

inp t

of

the

vertical

nit.

Set

the

Volts/Division

switch

of

the

vertical

nit

for

fo r

or

five

divisions

of

vertical

deflection.

Obtain

a

triggered

display.

Exa ple.

Ass me

a

reference

signal

freq ency

of

455

hertz

(period

2.19

milliseconds),

a

TIME/DIV

OR

DLY

TIME

switch

setting

of

.2

ms,

and

the

VARIABLE

control

adj sted

to

provide

a

horizontal

deflection

of

eight

divi



sions.

S bstit ting

these

val es

in

the

horizontal

conversion

factor

form la

(step

4)

:

Horizontal

Conversion

=

Factor

2.19

milliseconds

.2

m

s

x

8

=

1.37

@1

REV.

APR

1974

1-15

Operating

Instructions

—

7B53A/7B53AN

Operators

Then,

with

a

TIME/DIV

OR

DLY

TIME

switch

setting

of

50

µs,

the

period

of

an

nknown

signal

which

completes

one

cycle

in

seven

horizontal

divisions

can

be

determined

by

sing

the

period

form la

(step

6):

9.

M ltiply

the

distance

meas red

in

step

8

by

the

setting

of

the

TIME/DIV

OR

DL

Y

TIME

switch.

Period

(Seconds)

50

µs

X

1.37

X

7

=

480

µs

Exa ple.

Ass me

that

the

distance

between

the

time

meas rement

points

is

five

divisions

(see

Fig.

1-13),

and

the

TIME/DIV

OR

DLY

TIME

switch

is

set

to

.1

ms.

Using

the

form la:

This

answer

can

be

converted

to

freq ency

by

taking

the

reciprocal

of

the

period

in

seconds

(see

application

on

Determining

Freq ency

Meas rements).

Time

D ration

=

horizontal

distance

X

(divisions)

TIME/DIV

OR

DLY

TIME

setting

S bstit ting

the

given

val es:

Time

D ration

Meas rements

To

meas re

time

between

two

points

on

a

waveform,

se

the

following

proced re:

1.

Connect

the

signal

to

be

displayed

to

the

inp t

of

the

vertical

nit.

2.

Set

the

Vertical

and

Horizontal

Mode

switches

on

the

indicator

oscilloscope

to

display

the

pl g-in

nits

sed.

3.

Set

the

Volts/Division

switch

of

the

vertical

nit

to

display

abo t

fo r

divisions

of

waveform.

4.

Set

the

MAIN

TRIGGERING

controls

to

obtain

a

stable

display.

Time

D ration

=

5

X

0.1

ms

The

time

d ration

is

0.5

millisecond.

Determining

Freq ency

The

time

meas rement

techniq e

can

also

be

sed

to

determine

the

freq ency

of

a

signal.

The

freq ency

of

a

periodically

rec rrent

signal

is

the

reciprocal

of

the

time

d ration

(period)

of

one

complete

cycle.

Use

the

following

proced re:

1.

Meas re

the

time

d ration

of

one

complete

cycle

of

the

waveform

as

described

in

the

previo s

application.

5.

Set

the

TIME/DIV

OR

DLY

TIME

switch

to

the

fastest

sweep

rate

that

displays

less

than

eight

divisions

between

the

time

meas rement

points

(see

topic

entitled

"Time

Meas rements"

and

Fig.

1-8).

6.

Adj st

the

vertical

nit

position

control

to

move

the

points

between

which

the

time

meas rement

is

made

to

the

center

horizontal

line.

7.

Adj st

the

horizontal

POSITION

control

to

position

the

time-meas rement

points

within

the

center

eight

divisions

of

the

gratic le.

8.

Meas re

the

horizontal

distance

between

the

time

meas rement

points.

Be

s re

the

VARIABLE

control

is

set

to

CAL.

Fig.

1-13.

Measuring

the

ti e

duration

between

points

on

a

wavefor .

1-16

Tektronix 7853A User manual

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