Leader Electronics Corp. LDM-171 - Panel Functions; Front Panel

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-4··

..

3. PANEL FUNCTIONS

Fig. 3·1

3.1

Front

Panel (Fig. 3-1)

(D POWER {Pilot lamp)

Lights

when

power

is

on.

@ POWER (Switch)

Push

down

{ ...-..)

to

turn

power

on.

Pilot lamp

lights.

Push again

(I)

to

turn

power

off.

®FUNCTION

DISTORTION Press this switch

to

measure

S/N

VOLTMETER

distortion.

Press this switch

to

measure

S/N.

Press

the

V switch

to

measure

AC voltage

of

100mV

or

great·

er. Press

the

mV switch

to

measure AC voltages

of

100mV

or

less.

@)INPUT

Connect

the

signal

to

be

measured

to

these

ter-

minals.

Input

impedance

is

approximately

100krl

for

the

DISTORTION

and

S/N

func-

tions,

and

1

Mil

for

the

VOLTMETER function.

®SET

LEVEL range switch

Select

the

range for

distortion

and

S/N

meas·

u reme

nt

from

1 V

to

30V, depending

on

the

input

voltage.

@SET

LEVEL VERNIER

After

setting

the

approximate

level

with

the

SET

LEVEL range switch,

turn

the

VERNIER

control

to

move

the

pointer

to

the

fullscale

position {marked

SET

on

the

meter).

·>

·'

(!)OUTPUT

AC

output

proportional

to

the

mete~-

reading

is

provided

during

distoriton,

S/N

and

AC voltage

measurements.

@RANGE

These switches

set

the

measurement

range

for

each

of

the

functions.

The

SET

switch

is

used

in

distortion

and

S/N

measurement.

When it

is

. pressed,

meter

full scale

is

adjusted

to

the

value

set

by

the

SET

LEVEL

switches@

and

®-

® MODE

MAN

I I

AUTO..-.

In

distortion

measurement,

tuning

can be per·

formed

either

manually

or

automatically.

The

capture

ranges for

auto-tuning

(AUTO

--..

) are

from

1%

to

0.1%.

Note: When

auto-tuning

( ..-.. )

is

used,

the

FREO

FINE

@ and BALANCE

lV

con-

trols

are inoperative.

'-...._

@

Frequency

range dial

Use this two-speed dial

to

tune

the

LDM-171

to

the

input

frequency

in

distortion

measurement.

Turn

the

outer

dial

to

make

large changes

in

the

frequency.

Use

the

inner dial

for

general

tuning.

®

FREO

FINE ·

This

control

fine-adjusts

the

tuning

frequency

in

distortion

measurement.

Before using it,

move

the

pointer

down

to

about

1%

with

the

frequency dial

(10)

and

balance controls.

Note:

The

F

REn

FINE

control

is

inoperative

in

the

auto-tuning

mode.

Related product manuals

Leader Electronics Corp. LCR-740