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MANUAL

SUPPLEMENT

TEKTRO

N

IX

7B53A/7B53AN

DUAL

TIME

BASE

OPTION

5

INSTRUCTION

MANUAL

Tektronix,

Inc.

070-1471-00

P.O.

Box

500

Beaverton,

Oregon

97005

772

WARRANT

This

Tektronix

product

is

warranted

against

defective

materialsand

workmanship,

under

normal

use,

for

a

period

of

one

year

from

date

of

initial

shipment.

Tektronix

will

repair

or

replace,

at

its

option,

those

products

determined

to

be

defective

within

the

warranty

period

and

returned,

freight

prepaid,

to

a

Tektronix

Service

Center.

There

is

no

implied

warranty

for

fitness

of

purpose.

Please

direct

all

requests

for

service

or

replacement

parts

to

the

nearest

Tektronix

Service

Center

or

Field

Office;

include

the

type

or

part

number

of

the

product

and

its

serial

number.

Copyright

®

1972

by

Tektronix,

Inc.

All

rights

reserved.

Contents

of

this

publication

may

not

be

reproduced

in

any

form

without

the

permission

of

Tektronix,

Inc.

Products

of

Tektronix,

Inc.

and

its

subsidiaries

are

covered

by

U.S.

and

foreign

patents

and/or

pending

patents.

TEKTRONIX,

TEK,

SCOPE-MOBILE,

TELEQUIPMENT,

and

are

registered

trademarks

of

Tektronix,

inc.

Printed

in

U.S.A.

Specification

and

price

change

privileges

are

reserved.

7B53A/7B53AN

OPTION

5

SPECIFICATION

General

Information

The

TV

Sync

Separa or

permi s

TEKTRONIX

real- ime

oscilloscopes

o

display

composi e

video

signals.

The

TV

Sync

Separa or

clips

video

informa ion

from

he

incoming

video

signal;

hen,

i

amplifies

and

separa es

he

field

or

ver ical

rigger

pulses

from

he

line

or

horizon al

rigger

pulses.

Line

ra e

or

field

ra e

rigger

pulses

are

provided

depending

on

he

posi ion

of

he

fron

panel

swi ch.

This

manual

inser

describes

he

special

fea ures

of

he

7B53A/7B53AN

OPTION

5

plug-in

uni

which

has

been

modified

o

enable

riggering

on

composi e

video

signals

hrough

he

use

of

a

Sync

Separa or

circui .

The

EXT

÷

10

and

LINE

posi ions

of

he

Main

Triggering

Amplifier

SOURCE

swi ch

have

been

replaced

by

he

TV

FIELD

and

TV

LINE

swi ch

posi ions,

allowing

he

sweeps

o

be

riggered

by

he

ou pu

of

he

Sync

Separa or

circui

a

a

Field

or

Line

Ra e.

The

delayed

sweep

circui

has

TV

LINE/EXT

or

INT/EXT

SOURCE

riggering

capabili y,

depending

on

whe her

he

connec ion

is

made

o

P903

or

P904.

Compatability

The

TV

Sync

Separa or

can

be

used

wi h

7400,

7500,

7600,

7700,

and

7900-Series

real

ime

TEKTRONIX

oscilloscopes.

External

Graticules

Ex ernal

gra icules

for

he

main

frame

are

available.

Use

he

following

informa ion

when

ordering:

Main

Frame

External

Graticule

7403N-7603

CCIR

Composi e,

Par

No.

378-0684-04

NTSC

Composi e,

Par

No.

378-0684-05

Main

Frame

External

Graticule

7500,7700,7900

CCIR

Composi e,

Par

No.

378-0625-05

NTSC

Composi e,

Par

No.

378-0625-06

ELECTRICAL

CHARACTERISTICS

Connector

Input

or

Output

Signal

COMPOSITE

VIDEO

IN

(2

Major

Divisions)

Needs

2

major

divisions

peak- o-

peak

sync

nega ive

composi e

video

signal.

FIELD

RATE

A

group

of

one

o

six

pulses,

whose

minimum

ampli ude

is

2

V

nega



ive,

shall

re-occur

a

a

field

ra e.

The

wid h

of

each

individual

group

of

pulses

shall

no

exceed

3H.

LINE

RATE

The

line

rigger

pulses

available

shall

have

a

clean

leading

edge

and

a

minimum

ampli ude

of

180

mV

nega ive.

S STEM

CHARACTERISTICS

Compa ibili y

Compa ible

wi h

V

and

H

sync

signals

of

s andard

405,

625,

819

Line/50

Hz,

and

525

Line/60

Hz

broadcas

sys ems;

405

o

1201

Line

closed

circui

sys ems.

Trigger

Sensi ivi y

2

major

divisions

or

more

will

provide

s able

V

or

H

riggering.

1

7B53A/7B53AN

OPTION

5

OPERATING

INSTRUCTIONS

Introduction

This

sec ion

describes

using

he

TV

Sync

Separa or

por ion

of

he

ime

base

plug-in

uni .

Using

the

TV

Sync

Separator

Plug-In

a.

Connec

a

coaxial

cable

from

he

oscilloscope

ver ical

signal

inpu

connec or

o

a

composi e

video

signal

source

of

such

ampli ude

as

o

produce

a

leas

2

major

divisions

of

ver ical

deflec ion.

Se

he

7B53A/7B53AN

OPTION

5

con rols

as

follows:

Main

Triggering

Amplifier

SLOPE

MODE

COUPLING

SOURCE

AUTO

DC

TV

FIELD

TIME/DIV

MAG

Main

Time

Base

2

ms

X1

b.

Se

he

oscilloscope

Main

Triggering

Amplifier

SOURCE

swi ch

o

TV

FIELD

and

he

SLOPE

swi ch

o

—

.

c.

Refer

o

he

informa ion

under

Ob aining

a

Display

in

his

sec ion

o

ob ain

a

display.

Adjusting

the

CLIPPING

LEVEL

Control

(R914)

NOTE

If

the

input

amplitude

of

the

composite

video

changes,

it

may

be

necessary

to

readjust

the

CLIP



PIN

LEVEL

control

(R914).

a.

Connec

he

composi e

video

as

described

under

he

heading

Using

he

TV

Sync

Separa or

Plug-In.

b.

Turn

he

CLIPPING

LEVEL

con rol

(R914)

fully

clockwise.

c.

Se

he

oscilloscope

con rols

o

ob ain

he

desired

video

display.

d.

Slowly

ro a e

he

CLIPPING

LEVEL

con rol

(R914)

coun erclockwise

un il

a

poin

is

found

where

he

mos

s able

video

display

resul s.

TWO

FIELD

DISPLA

To

ob ain

a

wo

field

display,

adjus

he

LEVEL

con rol

o

ob ain

a

riggered

display.

The

TIME/DIV

VARIABLE

con rol

may

be

adjus ed

o

ob ain

a

display

of

sligh ly

less

han

wo

fields.

LINE

DISPLA S

1.

Variable

Line

Selector.

To

ob ain

Variable

Line

Selec or

capabili ies,

he

DLY'D

TRIG

con rol

mus

be

se

o

he

RUNS

AFTER

DLY

TIME

posi ion.

Pull

he

TIME/DIV

knob

ou ward

and

ro a e

he

knob

o

he

desired

ime/div

posi ion

(10

µs).

Ro a e

he

DELAY

TIME

MULT

con rol

o

he

desired

por ion

of

he

waveform.

Push

he

TIME/DIV

knob

in

and

he

desired

por ion

of

he

waveform

will

be

displayed.

The

delayed

sweep

is

free

running

in

his

mode

of

opera ion.

2.

Discrete

Line

Selector.

For

Discre e

Line

Selec or

capabili y,

place

he

Delayed

Sweep

Triggering

SOURCE

swi ch

in

TV

LINE

posi ion.

Ro a e

he

DLY'D

TRIG

con rol

ou

of

he

RUNS

AFTER

DLY

TIME

posi ion

and

se

he

con rol

o

ob ain

a

riggered

sweep.

Ro a e

he

DELAY

TIME

MULT

con rol

un il

he

desired

line

is

displayed.

When

ro a ing

he

DELAY

TIME

MULT

con rol,

he

display

will

jump

from

line

o

line.

3.

Main

Triggering

Amplifier

TV

Line.

Se

he

TIME/

DIV

swi ch

o

10

µs

and

check

ha

he

Main

Triggering

Amplifier

SOURCE

swi ch

is

se

o

TV

LINE.

Adjus

he

LEVEL

con rol

o

ob ain

a

s able

display

a

he

H

ra e.

Obtaining

a

Display

Ins all

he

TV

Sync

Separa or

Plug-In

in

he

oscilloscope

as

described

under

Using

he

TV

Sync

Separa or.

The

following

ins ruc ions

apply

for

he

7B53A/7B53AN

OP



TION

5

plug-in

uni .

DELA ED

INTERNAL

TRIGGER

OPTION

The

Delayed

Sweep

Triggering

SOURCE

selec ion

may

be

changed

from

TV

LINE/EXT

o

INT/EXT

or

vice

versa.

For

INT/EXT

riggering

source

capabili y,

move

he

coaxial

connec or

from

P903

o

P904

and

change

he

pushbu on

o

read

INT/EXT.

The

pushbu on

is

s ored

on

he

TV

Sync

Separa or

board.

2

7B53A/7B53AN

OPTION

5

CIRCUIT

DESCRIPTION

A

composi e

video

signal

from

0.1

vol

peak

o

peak

o

4

vol s

peak

o

peak

mus

be

supplied

o

P900

(COMPOSITE

VIDEO

IN)

connec or

o

ob ain

he

required

riggers

from

he

main

frame

ins rumen .

From

TP900

he

composi e

video

signal

passes

hrough

a

clipping

circui

composed

of

emi er

follower

Q904,

clipping

amplifier

Q90.8

and

associ



a ed

circui ry.

The

clipping

circui ,

whose

clipping

level

is

se

by

R914

(CLIPPING

LEVEL),

clips

only

he

video

from

he

composi e

video

signal.

From

he

clipping

circui

he

remaining

pulses

of

he

composi e

video

signal

are

amplified

by

Q920.

The

nega ive

(line

or

horizon al

sync)

pulses

presen

a

he

collec or

of

Q920

pass

hrough

CR921

and

C920

o

P902

and

P903.

When

he

Main

Triggering

Amplifier

SOURCE

swi ch

is

se

o

TV

LINE,

he

nega ive

(line

or

horizon al

sync)

pulses

are

available

in

main

rigger

or

delayed

rigger.

The

posi ive

(field

or

ver ical

sync)

pulses

presen

a

he

collec or

,of

Q920

canno

pass

hrough

CR921;

however,

hey

and

he

nega ive

(line

or

horizon al

sync)

pulses

will

pass

hrough

CR918

o

he

base

of

Q924.

The

nega ive

pulses

will

pass

hrough

CR918

since,

during

he

grea er

percen age

of

heir

du y

cycle,

he

line

or

horizon al

sync

pulses

are

posi ive

and

will

appear

o

CR918

as

posi ive

pulses.

The

line

or

horizon al

sync

pulses

are

kep

from

ge ing

hrough

Q924

by

he

RC

ne work

of

C926

and

R926.

During

he

line

or

horizon al

sync

pulse

ime,

Q924

is

kep

cu

off

by

he

bias

provided

by

C926.

The

charge

across

C926

is

kep

high

by

he

high

repe i ion

ra e

of

he

line

or

horizon al

sync

pulses.

During

he

field

or

ver ical

sync

pulse

in erval,

C926

biases

Q924

o

cu off

only

par

of

he

ime

due

o

he

rela ively

low

repe i ion

ra e

of

he

field

or

ver ical

sync

pulses.

The

ime

ha

Q924

is

allowed

o

conduc

is

such

ha

every

o her

field

or

ver ical

sync

pulse

will

be

amplified

by

Q924.

The

nega ive

field

or

ver ical

rigger

pulses

presen

a

he

collec or

of

Q924

are

supplied

hrough

emi er

follower

Q932

and

C932

o

P901

(FIELD

RATE)

connec or

and

o

he

TV

FIELD

pushbu on.

The

field

or

ver ical

rigger

pulse

group

are

available

cons an ly

a

P901

for

he

Main

Triggering

Amplifier

only.

C924,

loca ed

in

he

collec or

circui

of

Q924

and

he

base

circui

of

Q932,

serves

o

fil er

ou

any

line

or

horizon al

sync

pulses

which

may

s ill

be

presen .

CR932

se s

he

bias

on

Q932.

3

7B53A/7B53AN

OPTION

5

CALIBRATION

PROCEDURE

Optional

Test

Equipment

067-0601-00

Calibra ion

Fix ure

(Television

Tes

Signal

Genera or)

Plug-In

Cards

for

067-0601-00

Generator

067-5001-00

Sys em

A

405/50

067-5002-00

Sys em

M

525/60

067-5003-00

Sys em

B

625/50

067-5004-00

Sys em

E

819/50

067-5005-00

Sys em

F

819/50

067-5006-00

EIA

S andard

729/60

067-5007-00

EIA

S andard

875/60

067-5008-00

EIA

S andard

945/60

067-5009-00

EIA

S andard

1029/60

067-5010-00

EIA

S andard

1201/60

CHECK/ADJUST

PROCEDURE

1.

Check

TP900

Waveform

a.

Connec

a

composi e

video

signal

o

he

ver ical

plug-in

uni .

b.

Se

he

7B53A/7B53AN

OPTION

5

con rols

as

follows:

Main

Triggering

Amplifier

SLOPE

MODE

COUPLING

SOURCE

MAIN

TIME

BASE

AUTO

DC

TV

FIELD

NOTE

If

the

trigger

pick-off

circuit

is

overdriven

or

the

piug-in

Vertical

Position

control

is

rotated

to

its

fully

clockwise

or

counterclockwise

position,

the

wave



form

may

become

distorted.

If

so,

the

sync

separator

will

not

function

properly

unless

the

display

ampli



tude

is

2

major

divisions

as

described

in

part

c

of

this

step

and

the

Vertical

Position

control

is

moved

away

from

its

extreme

position.

2.

Check

TP926

Waveform

and

Adjust

R914

a.

Connec

he

10X

probe

o

TP926.

Se

he

es

oscilloscope

con rols

o

ob ain

a

s able

display.

b.

Adjus

he

Clipping

Level

con rol

R914

by

ro a ing

he

con rol

fully

clockwise.

Then,

ro a e

he

con rol

coun erclockwise

un il

one

or

more

nega ive-going

pulses

in

a

group

are

displayed

on

he

es

oscilloscope

during

he

ver ical

sync

pulse

in erval.

The

exac

number

of

pulses

is

dependen

on

he

elevision

s andard

of

he

composi e

video

signal

being

applied

o

he

ver ical

plug-in

uni .

Fig.

1

shows

a

normal

display

ob ained

for

he

525/60

elevision

s andard.

The

pulse

ampli ude

is

approxima ely

4

vol s

nega ive

below

he

H

pulses.

If

R914

is

improperly

adjus ed,

he

H

ra e

rigger

will

no

be

normal

during

he

ver ical

sync

pulse

in erval.

3.

Check

TP932

Waveform

a.

Connec

he

10X

probe

o

TP932.

MAG

X1

TIME/DIV

2

ms

c.

Adjus

he

ver ical

deflec ion

fac or

of

he

oscillo



scope

o

ob ain

a

2

major

division

display.

Adjus

he

7B53A/7B53AN

OPTION

5

Main

Triggering

Amplifier

LEVEL

con rol

o

ob ain

a

riggered

display.

d.

Connec

a

10X

probe

from

he

es

oscilloscope

o

TP900

on

he

TV

Sync

Separa or

board.

Connec

a

field

drive

signal

from

he

signal

genera or

o

he

es

oscillo



scope

Ex

Trig

Inpu

connec or

for

use

as

an

ex ernal

rigger

source.

e.

Check

for

a

normal

video

signal

display

on

he

es

oscilloscope

(same

as

signal

from

genera or).

Ampli ude

of

he

signal

will

vary

wi h

changes

of

inpu

signal

level.

Fig.

1.

Normal

525/60

waveform

at

TP926.

Vertical

deflection

factor

is

2

V/div;

time/div

is

50

µs.

4

7B53A/7B53AN

OPTION

5

b.

Check

for

a

es

oscilloscope

display

of

one

or

more

nega ive-going

pulses

in

a

group

during

he

ver ical

sync

pulse

in erval.

The

number

of

pulses

is

dependen

on

he

elevision

s andard

composi e

video

signal

being

applied

o

he

plug-in

uni .

The

pulse

is

very

fas ;

approxima ely

0.1

µs

in

wid h

a

he

50%

ampli ude

level.

Full

pulse

ampli ude

is

approxima ely

2.8

vol s.

4.

Check

TP920

Composite

Sync

Waveform

a.

Connec

he

10X

probe

o

TP920.

b.

Check

es

oscilloscope

display.

The

waveform

should

be

nega ive-going

composi e

sync

occurring

a

he

H

ra e;

ampli ude

should

be

approxima ely

180

mV.

All

video,

excep

burs ,

should

be

clipped

off.

5.

Check

Sync

Separator

Operation

a.

Apply

various

elevision

s andard

composi e

video

signals

(domes ic

and

closed

circui )

o

he

plug-in

uni .

NOTE

If

desired,

apply

only

those

composite

video

signais

that

will

be

used

at

your

facility.

b.

Wi h

he

10X

probe

connec ed

o

TP920,

check

he

es

oscilloscope

display

for

a

proper

waveform

as

described

in

s ep

4.

d.

Pull

he

DLY

TIME

knob

ou ward

and

se

he

DLY

TIME

swi ch

o

he

desired

posi ion

(10

µs).

Ro a e

he

DELAY

TIME

MULT

con rol

o

in ensify

he

desired

por ion

of

he

display.

Then,

push

he

DLY

TIME

knob

in

o

view

he

in ensified

por ion.

NOTE

In

this

mode

of

operation

the

delayed

sweep

is

free

running.

7.

Check

Discrete

Line

Selector

Operation

a.

Se

he

7B53A/7B53AN

OPTION

5

Main

Triggering

Amplifier

SOURCE

swi ch

o

TV

LINE.

Adjus

he

LEVEL

con rol

o

ob ain

a

riggered

display.

b.

Ro a e

he

DLY'D

TRIG

con rol

ou

of

he

RUNS

AFTER

DLY

TIME

posi ion

and

adjus

his

con rol

o

ob ain

a

riggered

delayed

sweep.

Ro a e

he

DELAY

TIME

MULT

con rol

o

display

he

desired

por ion

of

he

signal.

NOTE

in

this

mode

of

operation

the

displayed

portion

of

the

signai

will

jump

from

line

to

line

as

the

DELAY

TIME

MUL

Tcontrol

is

slowly

rotated.

c.

Disconnec

he

10X

probe.

6.

Check

Variable

Line

Selector

Operation

a.

Apply

he

desired

composi e

video

signal

o

he

ver ical

plug-in

uni .

b.

Check

ha

he

7B53A/7B53AN

OPTION

5

Main

Triggering

Amplifier

SOURCE

swi ch

is

se

o

TV

FIELD

and

he

TIME/DIV

swi ch

is

se

o

2

ms.

Se

he

TIME/DIV

VARIABLE

con rol

o

display

sligh ly

less

han

wo

fields.

Adjus

he

Main

Triggering

LEVEL

con rol

o

ob ain

a

riggered

display.

c.

Se

he

7B53A/7B53AN

OPTION

5

DLY'D

TRIG

con rol

o

RUNS

AFTER

DLY

TIME

posi ion.

Se

he

Delayed

Sweep

Triggering

con rols

as

follows:

SLOPE

COUPLING

DC

SOURCE

TV

LINE

8.

Check

Main

Triggering

Amplifier

TV

Line

Oper



ation

a.

Se

he

TIME/DIV

o

10

µs.

Check

ha

he

Main

Triggering

Amplifier

SOURCE

swi ch

is

se

o

TV

LINE.

b.

Adjus

he

Main

Triggering

Amplifier

LEVEL

con rol

o

ob ain

a

s able

display

a

H

ra e.

9.

Check

Delayed

Internal

Trigger

Operation

Move

he

coaxial

cable

connec or

from

P903

o

P904

on

he

TV

sync

separa or

board

and

change

he

Delayed

Sweep

Triggering

SOURCE

TV

LINE

pushbu on.

The

INT/EXT

pushbu on

is

s ored

inside

he

7B53A/7B53AN

OPTION

5

plug-in

uni

on

he

TV

Sync

Separa or

board.

5

7B53A/7B53AN

OPTION

5

PARTS

LIST

The

following

changes

should

be

made

o

he

appropria e

par s

lis

for

his

modified

ins rumen .

When

ordering

replacemen

par s

specify

ins rumen

ype,

serial

number,

and

mod

number.

Include

he

circui

number,

par

number,

and

descrip ion

of

he

desired

i em.

*Par s

iden ified

by

an

as erisk

are

unique

o

his

modified

produc

and

are

no

normally

s ocked.

Electrical

Parts

List

Capacitors

C900

Add

283-0092-00

0.03

µf

cer

200

V

+80%

-20%

C904

Add

290-0517-00

6.8

µf

em

35

V

C908

Add

281-0550-00

120

pf

cer

500

V

10%

C920

Add

283-0092-00

0.03

µf

cer

200

V

+80%-20%

C924

Add

281-0511-00

22

pf

cer

500

V

10%

C926

Add

281-0605-00

200

pf

cer

500

V

C929

Add

283-0010-00

0.05

µf

cer

50

V

C932

Add

283-0092-00

0.03

µf

cer

200

V

+80%

-20%

Diodes

CR908

Add

152-0075-00

Germanium

Tek

Spec

CR909

Add

152-0141-02

Silicon

1N4152

CR912

Add

152-0141-02

Silicon

1N4152

CR913

Add

152-0141-02

Silicon

1N4152

CR916

Add

152-0195-00

Zener

1N751A

0.4

W,

5.1

V,5%

CR917

Add

152-0075-00

Germanium

Tek

Spec

CR918

Add

152-0141-02

Silicon

1N4152

CR920

Add

152-0195-00

Zener

1N751A

0.4

W,

5.1

V,

5%

CR921

Add

152-0075-00

Germanium

Tek

Spec

CR932

Add

152-0075-00

Germanium

Tek

Spec

Transistors

Q904

Add

151-0188-00

Silicon

2N3906

Q908

Add

151-0188-00

Silicon

2N3906

Q920

Add

151-0192-00

Silicon

Replaceable

by

MPS-6521

Q924

Add

151-0192-00

Silicon

Replaceable

by

MPS-6521

Q932

Add

151-0188-01

Silicon

Replaceable

by

2N3251

Resistors

R900

Add

315-0221-00

220



1/4

W

5%

R904

Add

315-0563-00

56

k

1/4

W

5%

R905

Add

315-0471-00

470



1/4

W

5%

R907

Add

315-0681-00

680



1/4

W

5%

R908

Add

315-0203-00

20

k

1/4

W

5%

6

7B53A/7B53AN

OPTION

5

Resistors

(cont)

R909

Add

315-0334-00

330

k

1/4

W

5%

R910

Add

315-0105-00

1

m

1/4

W

5%

R912

Add

315-0182-00

1.8

k

1/4

W

5%

R913

Add

315-0182-00

1.8

k

1/4

W

5%

R914

Add

311-1226-00

2.5

k

var

R918

Add

315-0112-00

1.1

k

1/4

W

5%

R920

Add

315-0303-00

30

k

1/4

W

5%

R921

Add

315-0513-00

51

k

1/4

W

5%

R922

Add

315-0274-00

270

k

1/4

W

5%

R923

Add

315-0242-00

2.4

k

1/4

W

5%

R924

Add

315-0103-00

10

k

1/4

W

5%

R926

Add

315-0154-00

150

k

1/4

W

5%

R928

Add

315-0822-00

8.2

k

1/4

W

5%

R929

Add

315-0123-00

12

k

1/4

W

5%

R932

Add

315-0822-00

8.2

k

1/4

W

5%

R940

Add

315-0102-00

1

k

1/4

W

5%

R941

Add

315-0102-00

1

k

1/4

W

5%

S10

Change

Switch

670-1969-00

Main

T

rigger

Source

Test

Point

TP900

Add

214-0579-00

TP920

Add

214-0579-00

TP926

Add

214-0579-00

TP932

Add

214-0579-00

Mechanical

Parts

List

Pos ,

Me allic

Add

5

129-0339-00

Fron

Panel

Change

1

333-1542-00

Iden ifica ion

Tag

Add

1

334-1377-00

Knob

Add

1

366-1257-00

Swi ch

Trigger

Source

Change

1

670-1969-00

E.C.

Board,

T.V.

Sync

Separa or

Add

1

670-1970-00

Accessories

Manual,

Op ion

5

Supplemen

Add

070-1471-00

1

7