Biddle MEGGER - Page 57

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Figure

49

shows

the

Earth-to-Line

terminal

voltage

character-

istic

of

a

high-range,

heavy-duty

type

instrument

having

a

ballast

|

resistance

of

1.65

megohms.

More

detailed

voltage

characteristic

data

for

all

types

and

rat-

ings

of

“Megger”

Insulation

Testers

will

be

furnished

upon

request.

OUTER

SCALE

πι

TERMINAL

VOLTS

1000

VOLT

RANGE

01౪106

BY

£

500

VOLT

RANGE

TERMINAL

VOLTS

2500

VOLT

RANGE

MULTIPLY

BY

1

RESISTANCE

UNDER

TEST

IN

MEGOHMS

FIGURE

49.

Typical

Voltage

Characteristic

curves

for

Cat.

No.

638

Heavy-Duty

Megger

Insulation

Tester.

The

abscissae

scales

in

Figures

48

and

49

are

laid

out

to

corre-

spond

with

the

actual

scales

of

the

instruments.

This

practical

form

of

presentation

is

suggested

for

judging

the

voltage

characteristic

of

any

type

of

insulation

resistance

testing

device.

[5351