Eberline RO-2 - Page 13

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=

=

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UD.

лб

NE

—

MODEL

RO-2

reed

switches

with

a

very

high

open

circuit

impedance.

They

are

activated

by

a

permanent

magnet

which

moves

on

a

swinging

arm

on

the

outside

of

the

chamber

assembly,

S2,

the

shorting

switch,

is

located

in

the

right

side

of

the

chamber

assembly.

The

magnet

is

over

S2

when

the

range

switch

is

at

OFF,

BAT

1,

BAT

2,

or

ZERO.

S3,

the

switch

that

places

R2

in

the

circuit,

is

located

in

the

left

side

of

the

chamber

assembly.

The

magnet

is

over

S3

when

the

range

switch

is

at

the

5000

‚

or

500

mR/h

positions.

When

using

the

50

or

CHANGE!

5

mr/h

positions,

the

magnet

is

over

the

center

of

the

chamber

and

neither

S2

nor

S3

is

pulled

in.

This

leaves

КІ

as

the

active

feedback

resistor.

The

second

section

of

51

(51-В)

selects

full

amplifier

output

voltage,

or

one-tenth

of

the

voltage

to

supply

the

feedback

elements.

Full

amplifier

voltage

is

used

on

the

5000,

50,

BAT

1,

and

BAT

2

positions.

One-tenth

output

voltage

is

used

on

the

500,

5,

and

ZERO

positions.

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