Eberline RO-2 - Instrument Operation; Description of Controls; Using the Instrument and Important Notes

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`

*

-

MODEL

RO-2

SECTION

II

OPERATION

A.

DESCRIPTION

OF

CONTROLS

1.

Function

Switch:

Eight-position

rotary

switch

that

turns

the

instrument

OFF,

checks

the

condition

of

the

batteries,

checks

instrument

ZERO,

and

selects

the

range

of

operation

to

be

used.

2.

ZERO

Knob:

Used

to

set

the

meter

to

zero

when

the

ZERO

switch

position

is

selected

or

when

in

an

insignificant

radiation

field.

3.

Calibration

Controls:

Four

variable

resistors,

one

for

each

range.

.

B.

USING

THE

INSTRUMENT

1.

Turn

the

function

switch

to

ВАТ

/

and

then

to

BAT

2

positions.

The

meter

should

read

above

the

BATT

cut-off

line

in

both

cases.

‚

2,

Turn

the

function

switch

to

ZERO

position.

Check

that

the

meter

reads

zero.

If

not,

set

it

to

zero

with

the

ZERO

knob.

a.

Due

to

a

change

in

manufacturing

of

the

oper-

ational

amplifier,

Al,

the

zero

control

will

work

in

reverse

for

instruments

with

the

new

manufacturer's

amplifier.

These

devices

can

.

be

identified

by

the

description

“DAWN”

indicated

on

the

part.

This

should

pose

no

problem,

simply

turn

the

zero

control

in

either

direction.

To

zero

the

meter

as

appropriate.

3.

Set

the

function

switch

to

the

desired

range

of

operation.

The

switch

position

selected

is

the

full

scale

reading

of

that

range.

4.

When

measuring

8,

low

energy

у,

ог

x-ray

emis-

sions,

open

the

sliding

8

shield

on

the

bottom

of

the

case

_and

face

the

bottom

of

the

instrument

toward

the

radia-

tion

source.

To

open

or

close

the

shield,

depress

the

Їгїс-

CHANGE

3

tion

release

button

on

the

left

side

of

the

case

and

manually

move

the

slide,

or

let

it

fall

due

to

gravity.

When

the

shield

is

open,

protect

the

thin face

against

puncture

damage.

NOTES

a.

The

zero

setting

of

the

instrument

may

be

checked

in

any

radiation

field

by

merely

selecting

the

ZERO

position.

b.

When

selecting

the

most

sensitive

range

(5

mR/h),

switching

transient

noise

may

cause

a

tem-

porary

deflection

of

the

meter.

This

can

be

avoided

by

first

selecting

50

mR/h,

letting

the

needle

settle,

and

then

switching

to

5

mR/h.

с.

The

effective

center

of

the

ion

chamber

is

marked

by

dimples

at

the

front

and

sides

of

the

instru-

ment

case.

d.

Since

the ion

chamber

is

vented

to

atmospheric

pressure,

it

is

sensitive

to

changes

in

both

air

pressure.

and

temperature.

Tables

2-1

and

2-2

give

correction

fac-

tors

to

be

used

if

the

use

conditions

are

different

from

the

calibration.

conditions.

If

both

pressure

and

tem-

-

perature

are

different,

multiply

the

meter

reading

by

both

factors.

е.

Do

not

expose

the

instrument

to

fields

significantly

above

full

scale

for

the

range

selected

or

amplifier

gate

stress

and

possible

damage

may

result.

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