Eberline ESP-1 - SECTION V. MAINTENANCE; CALIBRATION

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MODEL

Е$Р-1

SECTION

V.

MAINTENANCE

A.

CALIBRATION

1.

General

The

ESP-1

is

an

extremely

versatile

instrument.

It

is

usable

with

a

wide

variety

of

detectors

and

can

be

calibrated

in

a

large

variety

of

radiation

units.

The

end

result

of

the

calibration

process

.

is

the

reading

provided

by

the

instrument.

The

accuracy

of

that

reading

depends

on

the

accuracy

achieved

in

the

calibration

process.

Properly

set

up

and

calibrated,

the

instrument

is

inherently

linear

and

accurate

because

of

its

microcomputer-based

design.

The

only

real

limitation

is

the

detector

and

its

application

in

a

particular

measurement.

For

detector

application

information,

see

section

VIII.

The

calibration

procedure

should

include

testing

for

instrument/detector

quality

(plateau)

as

well

as

adjusting

the

reading

to

the

radiation

field

at

the

detector.

A

recommended

procedure

follows:

NOTE

To

change

the

parameters

that

calibrate

the

ESP-1,

the

inquiry/calibration

mask

switch

must

be

on

(enabled).

(Lower

"mask"

switch

to

the

left,

figure

3-1).

High

Voltage

High-voltage

readout

is

via

an

analog-to-digital

conversion

(ref:

"Theory

of

Operation,"

section

IV).

The

readout

must

be

calibrated

to

equal

the

actual

high

voltage.

Connect

a

voltmeter

to

the

*

detector

connector.

The

input

impedance

of

the

voltmeter

must

be

1000

ΜΩ

or

greater.

Adjust

the

HV

control

for

900

V.

Select

the

"HV"

parameter

using

the

keypads.

Hold

RESET

and

"+"

or

RESET

and

"-"

until

the

readout

is

9.00

+

02

(900

V).

Instrument/Detector

Quality

The

overall

gain

of

the

instrument

is

adjustable

with

the

detector

bias

(high

voltage)

and

the

discriminator

setting.

The

gain

should

be

adjusted

for

the

maximum

detector

efficiency

that

also

provides

the

best

stability

for

the

measurement.

The

discriminator

setting

(threshold

input

sensitivity)

is

set

according

to

the

detector

type

to

be

used

and

may

be

set

by

either

of

the

following

methods.

The

pulse

generator

method

is

preferred.

`

a.

Pulse

Generator

(Eberline

MP-1

or

MP-2

recommended)

Connect

a

pulse

generator

with

a

calibrated

pulse

amplitude

output

to

the

ESP-1

detector

connector

Set

the

ESP-1

input

sensitivity

as

recommended

by

adjusting

the

D

(discriminator)

control

until

the

instrument

is

just

reading

the

pulse

generator

(see

figure

3-2).

А

ESP1.MAN/February

1992

5-1

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