Eberline ESP-1 - Page 19

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μα

на ны

ша

Um

Note

that

the

longer

the

RESET

and

+

or

-

are

held

down,

the

faster

the

value

changes.

In

this

manner

large

changes

in

value

can

be

made

in

a

relatively

short

period

of

time.

When

the

changing

value

approaches

the

desired

value,

release

the

keys

and

then

press

them

down

again

to

permit

slow

changes

in

the

displayed

numbers

until

the

desired

value

is

reached.

When

the

desired

value

of

"ALM

AT"

is

displayed,

press

the

MODE

key

to

return

to

the

bar

graph

display.

CAUTION

While

"ALM

AT"

is

being

displayed,

the

instrument

will

not

provide

an

audible

alarm

even

if

the

counting

rate

exceeds

the

alarm

point.

The

audible

alarm

is

only

active

in

the

Rate

Meter

Mode

when

the

bar

graph

is

displayed

(regardless

of

whether

the

bar

graph

is

on

scale

or

not).

4.

Overrange

Indication

When

the

detector

pulse

rate

exceeds

the

capability

of

the

ESP-1

to

maintain

a

linear

relationship

between

radiation

level

and

displayed

reading,

the

words

"

OVERRANGE'"

will

appear

on

the

display

in

place

of

the

analog

bar

graph.

Numerical

value

will

still

be

displayed

but

should

not

be

relied

upon

as

the

useful

range

of

the

ESP-1

and

detector

has

been

exceeded.

This

is

a

latching

condition,

and

once

it

occurs,

the

words

"OVERRANGE”

will

be

displayed

in

all

three

modes

of

operation.

To

clear

the

condition,

the

ESP-1

must

be

turned

off

and

then

back

on.

The

overrange

determination

is

based

upon

the

detector

pulse

rate

and

the

dead

time

(see

section

ILE.4.).

This

feature

requires

that

the

ESP-1

and

detector

be

properly

calibrated

for

it

to

function

correctly.

D.

OPERATION

IN

SCALER

MODE

Start

with

the

instrument

in

the

Rate

Meter

Mode.

Press

the

MODE

switch.

The

display

should

read:

SCALER

MODE

+

=

USE/-

=

NO

If

the

display

does

not

indicate

the

above,

the

Scaler

Mode

has

been

disabled

by

an

internal

switch.

To

enable

access

to

this

mode,

first

open

the

door

in

the

side

of

the

instrument

and

locate

the

switch

in

the

lower

left

comer

marked

SCALER,

Refer

to

figure

3-1.

Move

this

switch

to

the

ENABLE

position

by

sliding

it

to

the

left.

If

the

+

key

is

pressed,

the

Scaler

function

will

be

selected.

If

the

-

switch

is

pressed,

the

instrument

will

again

be

placed

in

the

Inquiry/Calibration

Mode

provided

it

has

not

been

disabled

by

the

internal

switch.

Press

the

+

key.

The

display

will

read:

UNITS

=

EVENTS

+

=

USE/-

=

NO

or

UNITS

=

(UNITS

SELECTED)

+

=

USE/-

=

NO

ESP1.MAN/February

1992

2-7

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