IFR FM/AM-1200A

IFR FM/AM-1200A

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1

!

For

AM

modulation,

the

demodulated

audio

dis-

played

on

CRT

wi

11

read

twice

the

percentage

of

modulation.

4-8-4

RESIDUAL

DISTORTION

The

"RESID"

position

of

the

VERTICAL

Attenuator

Selector

Control

(24)

allows

the

display

of

the

residual

distortion

or

noise

of

the

UUT,

as

received

at

the

EXT

MOD/SINAD

Connector

(15).

The

"RESID"

position

is

only

valid

when

the

Modulation

METER

Control

(4)

is

in "SINAD''

or

"DIST"

position.

4-8-5

TONE

GENERATOR

The

"TONE"

position

of

the

HORIZONTAL

Sweep

Selector

Control

(26)

applies

the

output

of

the

Programmable

and/or

Fixed

(1 kHz) Tone

Generators

to

the

horizontal

deflection

circuits

of

the

CRT.

This

func-

tion

is

useful

for

measuring

the

frequency

of

demodulated

audio

or

externally

applied

audio

signals,

using

the

Lissajou

method

of

frequency

comparison.

4-46

05

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