Connect-Tek CTIP-01 Dokumentacja Pobierz pdf (Strona 110)

oPTloN

05

TV

SYNC

SEPARATOR

The

information

and instructions

presented

in this

part

apply only

to

use

of

the

4658

Option

05

instrument

in

TV

applications.

GENERAL

INFORMATION

Option 05

provides

the

instrument

with

front-panel

selection

of additional

processing

of

trigger

signals

to

facilitate observation

and

measurement

of

composite

video and

related television

waveforms.

Added

circuits

provide

amplification,

selectable

polarity

inversion,

clip'

ping,

and

vertical-sync

recognition.

Two

positions

are

added

to

the

A TRIGGER

COUPLING

switch:

TV

FIELD

and

TV LINE.

When the

A

TRIGGER

COUPLING

switch

is set

to

TV

FIELD or

TV

LINE,

the

A

TRIGGER

SOURCE

switch

selects

the

source

of

signals to

be

processed

in the Sync

Separator.

This

includes

NORM

(composite

vertlcal signal),

CH

1

,

CH

2,

EXT,

or

EXT/I0

(LINE

source

is

not a

usable

function

with

TV

FIELD or

TV LINE

coupling).

When

the

A TRIGGER

COUPLING

switch

is set

to

TV

FIELD

or

TV

LINE,

the output

of

the

Sync

Separator

is

automatically

applied

to the

A Sweep

Trigger

circuits,

and

only

this signal

may be

used

for triggering the

A

Sweep.

For B Sweep,

the

horizontal sync signal

(line-rate

sync)

from the

Separator

is

fed

only to

the TV

LINE

position

on

the

B

TRIGGER

SOURCE

switch,

which may

be selected

at

the option

of the

user.

The Option

05

circuitry

may be

operated

either

from

normal sync-negative

composite

video

(with

the

A TRIG-

GER

SLOPE

switch

at

-)

or

from inverted

video

(SLOPE

switch

set

to

+).

This applies

to

most standard

broadcast

systems

using

from

405

to 819

lines,50

or

60

Hz

field

rates or

to

closed-circuit

systems

using

up

to

1201

lines and

60

Hz

field rates.

To optimize

video

measurements,

the

vertical amplifier

AC

input

coupling

capacitors

are

increased

from 0.02

to

O.2

1tF.

The

larger

physical

size

of these

capacitors

increases

the

input shunt

capacitance,

which

is normalized

at 24

pF.

@

98

4658/DM44

Operators

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