Fluke 540B - Measurement

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540B

STEP

CON

TROL

POSITION OPERATION

a POWER

ON

Set

the

RANGE

switch

to

succeedingly

lower

voltage

GALV

OPEN

ranges

until

an

indication

between 50%

and

100%

is

RANGE 1000v obtained

on

the

PERCENT

INPUT

meter.

When

MODE DC SEARCH

using

curren

t

shunts

see

parag

rap

h 2- 24.

b SENSITIVITY

LOW

Tap

the

GALV

switch

against

the

spring

tension

to

MODE

DC

TRANSFER

MOMENTARY

just

long enough

to

see

if

the

GAL-

GALV VANOMETER

needle

will

stay

on

scale.

Adjust

the

REFERENCE

COARSE COARSE

and

MEDIUM

contr

ols

until

a

zero

reading

ADJUST MEDIUM

is

obtained.

c

GALV OP

EN

Adjust

the

GALV

ZERO

control

for

a

zero

re

adi

ng

on

SENSITIVITY

ME

D

the

GALVANOMETER.

GALV

ZERO

d GALV

LOCK

Adjust

the

MEDIUM

and

FINE

contro

ls

for a z er o

REFERENCE

reading

on

the

GALVANOMETER.

ADJUST MED

IUM

e SENSITIVITY

TEST

0.1%

Th

e GALVANOMETER

will

deflect

to

the

right

by

an

amoun

t

equal

to a

0.1

% change

in

input

leve

l.

This

deflection

amount

may

be

used

to

determ

i

ne

the de -

flection

sensitivity

(percent

per

unit

of deflection),

which

in

turn

may

be

used

to

determine

the

percent

change r

epresented

by

an

on

scale

GALVANOMETER

deflection

as

follows :

Deflection

Sensitivity

=

0

·

1

%

Dt

% Chan

ge

=

0

·

1

% Dm

Dt

Dt

=

Th

e

number

of

divisions

of

meter

deflection

caused

by

the

operation

of

the

SENS

IT

IVITY

TEST

sw

i

tch

.

Dm

=

Th

e

nu

mber

of

divisions

of

meter

de

flection

found

in

the

transfer

measur

em

e

nt

.

f

SENSITIVITY

TES

T

OPR

Adjust

th

e GALV

ZERO

control

for

a

zero

readin

g

on

GALV

OPEN

the

GALVANOME

TER.

SENSITIVITY

HIGH

GALV

ZERO

g GALV LOCK

Adjust

the

FINE

contro

l

for

a

zero

read

ing on

the

REFERENCE

GALVANOMETER.

ADJUST FINE

h SENSITIVITY TEST

0.0

1%

The

GALVANOMETER

will

deflect

to

the

right

by

an

amount

equal

to

a

0.

01%

change

in

input

level.

This

deflection

amount

may

be

used

to

determine

the

de

-

fl

ection

sensitivity

(perce

nt

per

unit

of deflection),

which

in

turn

may

be

used

to

determ

ine

the

percent

change

represented

by

an

on

scale

GALVANOMETER

deflection

as

follows:

Deflection

Sensitivity

=

0. 01%

Dt

% Change =

0

·

01

%

Dm

Dt

NOTE:

Deflection

sensitivity

is

improv

ed

as

the

level

of

input

more

nearl

y

equals

the

range

s

ett

ing.

Figure 2

-5

.

DEF

L

ECTION

SENSITIVITY

2- 6

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