Fluke 540B - Voltage Source

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540B

ST

EP

CONTROL POSITION OPERATION

a

SENSITIVITY LOW Conn

ect

the

therma

l

converter

to

a

calibrated

de

REFERENCE

COARSE

sourc

e

voltage

equal

to

the

rms

va

lue

of

the

ac

to

ADJUST MEDIUM

be

calibrated.

Tap

the

GAL V

switch

against

the

POWER

ON

spring

tension

to

MOMENTARY

ju

st

long

enough

GALV

to

see

if

the

GALVANOMETER

needle

w

ill

stay

on

scal

e,

while

adjusting

the

COARSE

and

MEDIUM

REFERE

NCE ADJUST

controls

until

zero

re

ading

is

obtained.

b G

AL

V

OPE

N

Adjust

the

GALV

ZERO

control

for

zero

reading

SENSITIVITY MED on

the

GALVANOME

TER.

GALV

ZERO

c GALV LOCK

Using

the

MEDIUM

and

FINE

REFERENC

E

REFERENCE

MEDIUM ADJUST

controls,

zero

the

GALVANOMETER

ADJUST

FINE

needl

e.

d

GALV

OPE

N

Adjust

the

GALV

ZERO

control

for

zero

reading

SENSITIVITY HIGH

on

the

GALVANOMETER.

GALV

ZERO

e

GALV

LOCK Using

the

FINE

REFERE

NCE ADJU

ST

control,

REFERENCE

z

ero

the

GALVANOMET

ER

needle.

Do

not

use

ADJUST FINE

the

REFERENCE

ADJUST

control

s

except

to

zero

the

de

source

voltage.

f

GALV

OPEN

Di

sconnect

the

de

source

vo

ltage

from

the

external

converter

and

connect

the

ac

vol

tage

to

be

call

-

brated.

Use

caution

not

to

exceed

the

voltage

rating

of

th

e

converter

.

g SENSITIVITY LOW

Tap

the

GALV

switch

aga

ins

t

the

spring

tension

to

GALV MOMENTARY

just

long

enough

to

see

if

the

GAL-

V ANOMETER

needle

will

s t

ay

on

sca

l

e,

while

ad

-

justing

the

level

of

the

ac

voltage

to

be

calibrated.

Repeat

until

a

zero

reading

is

obtained

.

h GALV LOCK

Further

refine

the

adjustm

ent

of

the

ac

voltage

SENSITIVITY MED being

ca

li

brated

until

a

zero

read

ing

on

the

GAL

-

HIGH VANOMETER

needl

e

is

obtained

in

the

MED

and

IDGH SENSITIVITY p

ositions.

i GALV

OPEN

Disconn

ect

the

exter

nal

converter

from

th

e

ac

being

calibrated

and

connect

it

to

the

de s

tandard

sourc

e.

j GALV LOCK

Zero

the

GALVANOMETER

needle

with

the

FINE

REFERENCE

REFERENCE

ADJUST

control.

ADJUST FINE

k GALV

OPEN

Disconnect

the

external

converter

from

the

de

standard

and

connect

it

to

the

ac

voltag

e

being

calibrated.

1

GALV LOCK

Refine

the

adjustment

of

the

ac

vol

tage

being

cali

-

brated

for

zero

reading

on

the

GALVANOME

TER.

m

Repeat

steps

i

through

1

at

lea

s t

thr

ee

times

or

until

repeatibility

is

attained.

Record

th

e

ac

voltage

setting

.

n

Reverse

the

polarity

of

the

de

source

and

re

pe

at

steps

i

through

1

at

least

three

times

or

until

repeatibility

is

attained.

Record

the

ac

voltage

setting

.

0

Set

the

ac

source

voltage

adjustment

in

the

center

of

the

two

settings

recorded

in

steps

m

and

n.

The

rms

va

lue

of

the

ac

voltage

now

equals

that

desired.

Figure 2-1 2. CALIBRATI

NG

A

HF

VOLTAGE

SOURCE

2-14

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