Fluke 540B - SECTION III THEORY OF OPERATION

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540B

SECTION

III

THEORY OF

OPERATION

3- 1.

INTRODUCTI

ON

3-3.

GENERAL

3-2.

The

theory

of

operation

is

explained

in

this

section

with

the

aid

of

simplified

diagrams.

The

gen-

eral

over-all

description

is

followed

by

a

detailed

de-

scription

of

each

section

of

the

in

strument.

3-4.

Refer

to

Figure

3-1,

Model 540B Block Diagram.

With

the

MODE

switch

in

the

AC

SEARCH

position,

the

input signal

passes

from

the binding

posts

thru

the

MODE

switch,

thru

the

first

protection

relay

(K801)

and

to

the

Search

Compensated

Attenuator.

The output

of

the

at-

tenuator

is

connected

to

another

section

of

the

MODE

switch

and

to the

Protection

Amplifier. The

signal

path

SEARC

H

COMPENSA

T

ED

ATTENUATO

R

T

RA

N

SFER

COMPENSATED

ATTEN

UAT

OR

TRA

NSFE

R

M

ODE

RE

LAY

SEAR

CH(K70

1)

R

704

RESET

MODE

SW.

POWER

SW.

Figure

3-

1. M ODEL

540B

BLOCK DIAGRAM

R

ELAYS

(3) RE

LAY

BA

TTERY

REfERE

N

CE

(A

DJUST)

SUPP

LY

(K

301)

3-1

- - - -

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