Sharp R-309B Instruções de Operação descarregar pdf (Página 38)

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Table

5-3.

Crystal-Oscillator

Adjustment

(Continued)

STEP

FUNCTION

TEST

POINT

OR

ADJUSTMENT

PERFORMANCE

STANDARD

2F

Rotate

the

HARM.

AMP;

TUNING

control

slowly

clockwise

to

the

first

peak

reading

on

the

FRE-

QUE NCY

meter.

2G

Set

the

function

switch

to

FREQ.-

DEV.

MEASURE

and

ensure

that

the

SELECTIVITY

switch

is

in

the

NORMAL

position

.

2H

Set

the

±kHz

(FREQUENCY

lever)

to 5

and

the

FREQUENCY

BELOW

40 MHz - ABOVE 40 MHz

control

to

the

appropriate

position.

2J

Vary

the

signal

generator

around

the

channel

frequency

until

the

SIGNAL

LEVEL

lamp

lights.

KOTE

False

responses

may

be

en-

countered

when

varying

the

sig-

nal

generator

frequency

too

far

above

or

below

the

assigned

frequency.

2K

If

the

SIGNAL

LEVEL

lamp

does

not

light,

the

HARM.

AMP.

TUWNG

control

may

be

tuned

to

the

wrong

peak.

2L

Set

the

function

switch

to HARM.

AMP.

TUl\lNG

and

rotate

the

HARM. A1\IP. TUNING

control

slowly

clockwise

to

the

next

peak.

Repeat

steps

2G

through

2J.

.

2M

When

the

SIGNAL

LEVELlamp

lights

center

FREQUE?\CY

meter

with

signal

generator

frequency

control.

::\OTE

Ensure

that

the

FREQUENCY

meter

deflects

towards

the

plus

(+)

side

when

increasing

the

sig-

nal

generator

frequency.

~

~

f!!!

~

[;

~

~

5-6

5601"0015"1

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