Canberra 2012 User manual

Table of contents

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اب

AMPLIFIER󰾰

)48

202

)4

COARSE

GAIN

в 2

P/Z

ADJUST

INPUT

POLARITY

*

SPECTROSCOPY

AMPLIFIER

MODEL

2012

CONTENTS

Page

1

INTRODUCTION

1.1

General

Description

14

1.2

Applications

s

m

E

1-1

1.2.1

The

NaK(TD)

Life

Time

System

КЕ

НАВЕ

1-1

2

SPECIFICATIONS

2.1

ВИЕ

окт

пиша

22

Outputs

2...

2.3

Performance

24

Controls

25

Jumper

Plugs

3

2.6

Connectors

Types

.

27

Power

Requirements

2.8

Physical.

гора

235%

3

CONTROLS

AND

CONNECTORS

3.1

Ganera

«4

2

a

east

چم󰾯

‚3-1

3:2

Front

Panel

3-1

3.3

Rear

Panel

23-2

4

OPERATING

INSTRUCTIONS

General

Брен

иа

heen

на

ва

Spectroscopy

System

Operation

System

Setup

Performance

Adjustments

Resolution

Versus

Count

Resend

Shaping

ума

Ра

AS

Baws

аф.

46

4.3

Resolution

Destroying

Interferences

........

4-6

5

CHECKOUT

AND

MAINTENANCE/CALIBRATION

Equipment

Required

я

NIM

۷۵۱۵8۴۰۵۵

а

зл

موی

مر󰾯

ise

Current

Measurements

.......

DC

Level

Checks

and

Adjustments

.

Initial

Setup)

«vc

vus

Amplifier

DC

Levels

........

Restorer

Threshold

DC

Levels

а

Amplifier

perane

Checks

Initial

Setup

—

Output

Pole

Zero

Adjustment

Coarse

and

Fine

Gain

Controls

........

O

E

TECHNOLOGIES

Р.О.

BOX

703,

118

RD.

51:

LA

MADERA,

NM

87539

(505)

583-2482

چا

مه

ما

ком󰾰

е

ma

o o o

o

o

boit

SPECTROSCOPY

AMPLIFIER

MODEL

2012

CONTENTS

(Continued)

Shaping

Checks

Noise

Measurement

TET

Linearity

Check

.............

THEORY

OF

OPERATION

байа

ون

مه󰾯

kas

aoe

هه󰾯

Block

Diagram

Description

ам

уез

The

Amplifier

Section

...........

Circuit

Description

А

Gain

Amplifiers

.

. . .

Input

Amplifier

Kl

...

Gain

Amplifier

K2

Integrator

Amplifier

AS

............

Amp

Output

Integrator

апе:

DAVEE:

Purse

V

rie

Sa

RG

L

Restorer

T

SPECTROSCOPY

AMPLIFIER

MODEL

2012

Section

1

INTRODUCTION

1.1

GENERAL

DESCRIPTION

The

Model

2012

Spectroscopy

Amplifier

was

designed

using

the

latest

integrated

circuit

technology

to

insure

a

long

lifetime

of

reliable

and

precise

operation.

The

key

to

the

performance

of

this

instrument

is

a

cleverly

designed

baseline

restorer

which,

because

of

its

symmetrical

characteristics,

provides

high

resolution

for

both

Ge

and

HP

Ge

detectors.

The

reset

pulses

of

the

optical

preamplifier

of

the

HP

Ge

detector

are

no

problem

to

the

Model

2012.

Although

it

is

a

high

performance

instrument.

the

Mode]

2012

is

also

very

versatile.

[t

has

al]

the

characteristics

necessary

to

make

it

useful

with

scintillation

photomultipliers.

gas

proportional

counters,

surface

barrier

detectors,

high

purity

Ge

and

of

course

Ge(Li)

detectors.

High

gain.

low

noise,

selectable

time

constants.

and

count

rate

optimization

are

several

of

the

more

important

features

designed

into

the

amplifier.

1.2

APPLICATIONS

This

section

is

not

intended

as

a

complete

survey

of

applications.

It

is

intended

to

highlight

the

most

important

features

of

the

module

and

to

indicate

representative

areas

where

they

might

be

applied.

1.2.1

The

Ма!

СП)

LIFE

TIME

SYSTEM

The

Model

2012

amplifier

is

a

versatile

spectroscopy

grade

instrument

capable

of

high

count

rate

restoration

when

used

with

a

variety

of

detectors.

Selectable

shaping

time

constants

of

0.5

and

usec

for

use

with

Nal(

TD),

Gas

Proportional,

Silicon

Surface

Barrier.

Ge(Li),

and

high

purity

Germanium

detectors,

are

pushbutton

selectable

inside

the

unit.

To

obtain

excellent

count

rate

performance

from

this

amplifier

does

not

require

the

adjustment

of

variable

restorer

rates

and

thresholds.

A

symmetrical

restorer

automatically

compensates

for

a

wide

range

of

count

rates.

The

gain

range,

temperature

stability

and

non-linearity

specifications

enable

the

2012

to

be

used

in

many

applications

requiring

long

counting

times.

One

application

diagrammed

in

figure

1-1

shows

the

2012

being

used

with

four

separate

detector

systems.

each

utilizing

the

2012

as

the

amplifier

element,

to

provide

their

outputs

to

a

mixer

‘router

which

directs

each

to

1024

channels

of

MCA

memory.

The

Ge(Li),

and

Gas

Proportional

detectors

utilize

a

2usec

shaping

time

constant

while

the

Surface

Barrier

uses

0.5изес.

The

Nal

Life

Time

System

uses

the

20]2

Amplifier

Unipolar

output

to

time

the

occurrence

of

a

gamma

event

from

each

detector.

The

two

timing

SCA

outputs

are

then

translated

by

a

TAC

into

a

pulse

spectrum

proportional

to

the

time

difference

between

the

output

signals.

©

E

TECHNOLOGIES

Р.О.

BOX

703,

118

RD.

51€

LA

MADERA,

NM

87539

(505)

583-2482

DETECTOR

РВЕАМР

AMPLIFIER

2012

bec

Mixer/

Router

МСА

ај

201

SE

2001

Уеб

3100-4K

7400

|

8220/4

Options

-

01

-02

2013

CO

bs

2006E

вас

Proportional

Counter

2007P

Leading

Edge

or

*

Constant

Fraction

Timing

SCAs

es

2037

2007P

اوت󰾯

e

Figure

1-1.

Хай

П)

Life

Time

System

2.1

INPUTS

(SIGNAL)

INPUT

2.2

OUTPUTS

UNIPOLAR

OUTPUT

2:33

PERFORMANCE

GAIN

RANGE

OPERATING

TEMPERATURE

RANGE

GAIN

DRIFT

DC

LEVEL

DRIFT

Section

2

SPECIFICATIONS

Accepts

positive

or

negative

linear

pulses

from

an

associated

preamplifier.

Input

BNC

connectors

located

on

front

and

rear

panels.

Amplitude:

0

to

+

2

Volts

for

a

linear

output;

+

12

Volt

max.

Rise

Time:

Less

than

the

shaping

time

constant

selected.

Decay

Time

Constant:

30useconds

to

ое

Input

Impedance:

Approximately

1K

Ohms.

Provides

positive-only

linear

pulses.

BNC

connectors

are

located

on

the

front

and

rear

panels.

Short

circuit

protected.

Amplitude:

+

10

Volts

maximum.

Timing:

Prompt.

Shaping:

Active

filter

near-Gaussian

shaped.

Coupling:

DC

restored.

Factory

calibrated

for

0

+

5mVDC.

Front

Panel

Zout:

less

than

1

ohm

ог

93

ohms.

internally

selectable.

Rear

Panel

Zout:

93

ohms

Continuously

adjustable

from

X12

to

Х1280.

product

of

the

Coarse

and

Fine

Gain

Controls.

Coarse

Gain

Steps

are:

X4,

X8.

X16,

X32,

X64.

and

X128.

Fine

Gain

Range

covers:

X3

to

X10.

Oto

+

50°C.

Less

than

+

0.0075%/0С

of

full

scale.

Less

than

z

50۷

۰

INTEGRAL

NONLINEARITY

OVERLOAD

RECOVERY

PULSE

SHAPING

SHAPING

TIME

CONSTANTS

NOISE

CONTRIBUTION

RESTORER

COUNT

RATE

PERFORMANCE

ЗРЕСТВОМ

BROADENING

PEAK

SHIFT

POWER

SUPPLY

SENSITIVITY

24

CONTROLS

COARSE

GAIN

FINE

GAIN

Less

than

+

0.05%

of

full

scale

linear

output

range.

Will

recover

to

within

=

2%

of

the

full

scale

output

in

2

pulse

widths

for

a

x

1000

overload

with

the

pole/zero

cancellation

properly

set.

Semi

Gaussian

shape:

One

differentiator,

two

active

integrators,

and

only

one

secondary

time

constant

(Approximately

50тзес);

time

to

peak

is

approximately

1.75

times

the

shaping

time

constant.

O.Susec

or

2usec

unipolar shaping;

internally

switch

selectable.

With

2usec

shaping

time

constant,

less

than

7шу

RMS

referred

to

the

input

for

any

gain

greater

than

100.

Time

variant

(gated):

on

continuously.

Unipolar

Output,

2usec

shaping.

FWHM

of

a

Соб0.

1.33MeV

gamma

peak

for

an

incoming

count

rate

of

2kcps

to

50ксрѕ

and

a

9

Volt

pulse

height

will

typically

change

less

than

165.

The

peak

position

of

a

CoO.

1.33MeV

gamma

peak

for

an

incoming

count

rate

of

2kcps

to

50kcps

and

а

9

Volt

pulse

height

will

shift

less

than

2

0.024%.

Supply

AMP

DC

LEVEL

+

۷

10тУ

'Volt

-

24У

10mV/Volt

+12V

6mV/Volt

2

12V

و󰾯

Supply

AMP

GAIN

+2۷

0.028

۶

-24V

0.028

۶

*12V

0.011

%/Volt

42V

0.0022%/Volt

Front

panel

rotary

switch,

32:1

range

in

six

binary

steps.

Front

panel

ten

turn

precision

potentiometer.

X3

to

XIO

range,

allowing

maximum

accuracy

and

resetability.

t

b

POLE/ZERO

INPUT

POLARITY

TIME

CONSTANTS

2.5

JUMPER

PLUGS

Zout

2.6

CONNECTORS

TYPES

INPUT

UNIPOLAR

OUTPUT

TEST

POINT

PREAMP

POWER

2.7

POWER

REQUIREMENTS

2.8

PHYSICAL

SIZE

NET

WEIGHT

SHIPPING

WEIGHT

Front

panel

twenty-two

turn

screwdriver

adjustment

potenticmeter

to

optimize

the

Amplifier

baseline

recovery

and

overload

performance

for

the

preamplifier

time

constant

and

main

amplifier

pulse

shaping

chosen;

range

30usec

to

ге

preamp

decay

time

constant

Front

pane!

toggle

switch,

*

(positive),

-

(negative)

positions;

only

affects

signal

INPUT

connector.

Internal

push

button

switch

to

select

shaping

time

constant

of

0.5

or

2.Орзес

2

position

jumper

plug

that

selects

the

front

panel

UNIPOLAR

OUTPUT

impedance

of

less

than

1

ohm

or

approximately

93

ohms.

Shipped

in

the

low

impedance

position.

Front

and

rear

panel.

BNC.

Front

and

rear

panel.

BNC.

Unipolar

Output.

front

panel,

Selectro

-

SKT-41

Rear

panel,

Amphenol

#17-10090.

+24УрС

-

45۳۸

-

24۷17

-

50тА

+12VDC

-

40mA

-12VDC

-

30mA

Standard

single-width

NIM

module

1.35

x

8.71

inches

(3.43

x

22.13

CM)

per

TID

20893

(rev.).

2.2

Ibs.

(1.0

kgs.)

4.0

Ibs.

(1.8

kgs.)

y

Section

3

CONTROLS

AND

CONNFCTORS

3.1

GENERAL

Complete

understanding

of

the

purpose

of

the

various

controls

and

connectors

is

essential

for

the

proper

operation

of

the

Model

2012

and

it

is

recommended

that

this

section

be

read

before

proceeding

with

the

operation

of

the

module.

3.2

FRONT

PANEL

(See

Figure

3-1)

COARSE

GAIN

Six

position

rotary

switch

selects

gain

factors

of

X4,

ХВ,

X16,

X32,

‘X64

and

X128;

multiplied

by

the

FINE

GAIN

control

settings.

FINE

GAIN

Ten

turn

precision

potentiometer

selects

variable

gain

factor

from

X3

to

X10.

Resetability

within

£0.03%.

POLE

ZERO-

22

turn

screwdriver

adjust

potentiometer

to

compensate

for

the

undershoot

caused

by

the

preamplifier

fall

time

constant

Adjustable

for

preamplifier

fall

time

range

of

З0увес.

to

оо.

INPUT

POLARITY

Toggle

switch

to

set

the

Model

2012

for

the

polarity

of

the

incoming

preamplifier

signal.

UNIPOLAR

OUTPUT

Provides

a

positive

semi-gaussian

Output

pulse;

active

filter

pulse

shaping,

Look

under

Section

2.2

for

signal

specifications.

Test

point

is

provided,

tes

point

‘output

impedance

is

470

ohms.

INPUT:

Accepts

positive

or

negative

linear

pulses

from

asiociated

preamplifier.

Signal

requirements

are:

Amplitude

0

to

+12

volts

^

maximum;

Rise

time

less

than

shaping

time

constant;

Decay

time

constant

30sec

10

соў

approximately

1K

ohms.

Figure

3-1.

Front

Panel

Controls

and

Connectors

3-1

3.3

REAR

PANEL

(See

Figure

3-2)

INPUT.

Additional

input

wired

in

parallel

with

the

front

panel

signal

INPUT

BNC

connector.

UNIPOLAR

OUTPUT

Signal

specifications

are

identical

to

the

front

panel

output

except

for

93

ohm

series

-

connected

PREAMP

POWER

output

impedance.

Use

this

rear

Provides

power

for

any

Canberra

panei

output

when

driving

long

preamplifier;

Model

1708

lengths

of

interconnecting

coaxial

Preamplifier

requires

a

special

cable

to

prevent

distorting

the

cable.

linear

signal

(oscillations).

PIN

FUNCTION

1

Ground

2

Clean

Ground.

4

+12VDC

6

-

MVDC

1

+24VDC

E

-12мрс

а

MODULE

POWER

Connector

accepts

operating

voltages

from

an

AEC

Standard

NIM

bin/power

supply

such

as

the

Canberra

Model

2000.

FUNCTION

16

+12VDC

17

-12VDC

28

*24VDC

29

-замос

34

Ground

42

‘Clean

Ground

Figure

3-2.

Rear

Panel

Controls

and

Connectors.

3-2