Eberline ESP-1 - Page 26

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2-14

|

Procedure

for

Determining

the

Present

Setting

for the

High

Voltage

as

Viewed

on

the

Display:

After

the

desired

value

for

DT

is

selected

(as

discussed

above),

press

+.

The

display

will

then

show

the

present

value

for

the

high

voltage

setting

and

will

look

like

this:

HV

=

(NUMERICAL

VALUE)

RATEMETER

READING

If

this

value

is

not

the

recommended

high

voltage

for the

detector

which

you

plan

to

use

with

the

instrument,

change

the

value

using

the

directions

given

in

step

d.

(following).

CAUTION

Do

not

attempt

to

adjust

the

high

voltage

using

the

keys

on

top

of

the

instrument.

This

adjustment

is

accomplished

by

an

internal

potentiometer.

Changing

the

High

Voltage:

(1)

Disconnect

the

detector

from

the

instrument

by

rotating

the

MHV

connector

counterclockwise

and

then

open

the

door

on

the

side

of

the

instrument.

(2)

Refer

to

figure

3-1.

Using

a

small

screwdriver,

adjust

the

potentiometer

marked

HV

(3)

(the

third

potentiometer

from

the

right)

until

the

value

seen

on

the

display

is

the

value

desired

for

the

operating

high

voltage.

The

operating

high

voltage

must

be

changed

when

switching

to

a

different

type

of

detector,

such

as

switching

from

Geiger-Mueller

(G-M

or

ionization)

type

of

detector

(HP210,

HP-260, HP-190,

HP-270,

HP-290)

to

a

scintillation

type

detector

(LEG-1,

SPA-3,

SPA-6,

etc.)

or

to

the

neutron

detector

(NRD-1).

To

accomplish

this,

remember

that

high

voltage

can

only

be

changed

with

a

screwdriver

at

the

side

of

the

instrument

(inside

the

compartment

at

the

right

side)

by

adjusting

the

correct

potentiometer

(Figure

3-1)

and

viewing

the

values

on

the

display

until

the

desired

voltage

is

reached.

Do

not

attempt

to

change

the

values

shown

on

the

display

for

"HV"

by

pressing

RESET

and

+

or

-.

This

would

change

the

calibration

of

the

display

itself;

it

does

not

change

the

high

voltage.

If

this

occurs,

the

instrument

will

have

to

be

recalibrated

by

returning

the

instrument

to

the

factory

for

recalibration.

It

is

possible

to

operate

the

detector

at

the

wrong

high

voltage

and

not

realize

it.

This

may

result

in

damage

to

the

detector

or

may

result

in

erroneous

values

being

presented

on

the

display

of

the

ESP-1.

Make

sure

that

you

check

the

high

voltage

when

changing

from

a

scintillation

detector

to

a

Geiger-type

detector,

before

you

attach

the

detector

to

the

ESP-1.

This

will

protect

your

Geiger

detectors

from

accidental

exposure

to

voltage

which

is

too

high

for

the

tube.

The

detector

of

choice

may

now

be

attached

to

the

ESP-1

since

there

is

now

assurance

that

the

correct

high

voltage

will

be

applied

by

the

instrument

to

the

detector.

ESPI.MAN/February

1992

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