Mirion Technologies 814FP Bedienungsanleitung

Model

814FP

Pulser

9232092D

User’s M

anual

The material in this document, including all information, pictures,

graphics and text, is the property of Mirion Technologies (Canberra),

Inc. and is protected by U.S. copyright laws and international copyright

conventions.

Mirion Technologies (Canberra) expressly grants the purchaser of this

product the right to copy any material in this document for the

purchaser’s own use, including as part of a submission to regulatory or

legal authorities pursuant to the purchaser’s legitimate business

needs.

No material in this document may be copied by any third party, or

used for any commercial purpose or for any use other than that

granted to the purchaser without the written permission of Mirion

Technologies (Canberra), Inc.

Mirion Technologies (Canberra), Inc., 800 Research Parkway,

Meriden, CT 06450

Tel: 203-238-2351 FAX: 203-235-1347 http://www.canberra.com/.

The information in this document describes the product as accurately

as possible, but is subject to change without notice.

Printed in the United States of America.

For technical assistance, call our Customer Service Hotline at 1-800-

255-6370 or email techsupport@canberra.com.

Table of Contents

1. Introduction .................................................................................... 1

2. Controls and Connectors .............................................................. 2

Front and Rear Panels.....................................................................................................................2

3. Pulser Operation ............................................................................ 3

Setting the Amplitude.....................................................................................................................3

Normalizing the Output..................................................................................................................3

The Rate Control ............................................................................................................................3

Rate Multiplier and Decay Selector................................................................................................4

Selecting the Output Mode.............................................................................................................4

Attenuating the Output ...................................................................................................................4

A. Specifications................................................................................. 5

Input................................................................................................................................................5

Outputs ...........................................................................................................................................5

Controls ..........................................................................................................................................5

Indicators........................................................................................................................................6

Performance....................................................................................................................................6

Power Requirements.......................................................................................................................6

Physical...........................................................................................................................................7

Environmental ................................................................................................................................7

B. Installation Considerations ........................................................... 9

C. FCC Notice ................................................................................... 10

Model 814FP Pulser User’s Manual – 9232092D i

Important Safety Considerations

Read Carefully

Indicates warning of mains or high voltage present at output labeled HV.

Risk of electrical shock if covers are removed.

Caution –

risk of danger. Refer to documentation for detailed explanation of caution

symbol wherever marked.

Earth tree symbol: indicates the connection point for the primary earth (ground)

supply.

Product complies with appropriate current EU directives (Low Voltage & EMC).

Product complies with appropriate current FCC /UL / CSA 61010-1 directives

(Low Voltage & EMC).

Manufacturer’s Address

Mirion Technologies (Canberra), Inc.

800 Research Parkway

Meriden, CT 06450 USA

ii Model 814FP Pulser User’s Manual – 9232092D

1. Introduction

The Canberra 814FP Pulser is a single-width NIM module designed to simulate the

output from a solid-state or scintillation detector/preamplifier combination, thereby

providing a means of testing and calibrating the electronics in a nuclear counting

system.

The 814FP offers a fast rise time (typically 10 ns) signal and variable repetition rates

of up to 2 kHz. Either square wave or tail pulse outputs are selectable. The 814FP is

unique in that the square wave output will not degrade the resolution of a gamma

spectroscopy system even if it is run simultaneously with a germanium detector.

Other tail pulsers introduce an additional pole into the preamplifier/amplifier

combination, preventing the amplifier from properly pole/zeroing the system. This

results in spectrum broadening, especially on the low energy side.

The 814FP can be calibrated to read directly in terms of energy with the ten-turn

precision PULSE HEIGHT potentiometer, NORMalize control and ATTENUATOR

switches. The PULSE HEIGHT control has a maximum nonlinearity of +0.25% and

the ATTENUATORS use 1% resistors.

Calibration of nuclear spectroscopy systems and multichannel analyzers, evaluation

of system stability, measuring the integral nonlinearity and noise of amplifiers, and

selecting delays in coincidence timing systems are typical of the wide range of

applications for the Canberra 814FP Pulser. The variable repetition rate is also useful

in determining the system’s count rate performance.

The 814FP offers either a direct output or an attenuated output. When all the

attenuator switches are in the “out” position the output is direct. Attenuation factors

of up to 1000:1 are selectable via two-position switches with gold-plated contacts.

These contacts greatly improve both the reliability and the long-term stability of the

attenuator section.

A DISABLE input is featured on the 814FP for gated operation and is selectable as

active High or active Low for interfacing with a wide variety of devices. It is also

synchronized with the internal pulse generator to prevent erroneous outputs. The

disable feature enables the 814FP to be turned on or off by remote or computer

control.

A SYNC output is provided on the front panel for convenient oscilloscope triggering

while monitoring either the system output or waveforms from the 814FP.

814FP Pulser User’s Manual – 9232092D 1

Chapter 2Controls and Connectors

2. Controls and Connectors

Front and Rear Panels

This is a brief description of the 814FP’s front panel controls and connectors. For

more detailed information, refer to Appendix A, Specifications

Figure 1Front Panel Controls and Connectors

2 814FP Pulser User’s Manual – 9232092D

Setting the Amplitude

3. Pulser Operation

The Canberra Model 2000 Bin and Power Supply, or other bin and power supply

systems conforming to the mechanical and electrical standard set by DOE/ER-0457T

will accommodate the Model 814FP.

Before installing the Model 814FP in the NIM Bin, the internal controls, accessible

through cutouts in the side cover, should be set to their desired positions.

The right side cover of the NIM module acts as a guide for insertion of the

instrument. The module is secured in place by turning the two front panel captive

screws clockwise until finger tight. It is recommended that the NIM bin power switch

be off whenever the module is installed or removed.

The Model 814FP can be operated where the ambient air temperature is between 0

°C and +50 °C (+120 °F maximum). Perforations in the top and bottom sides permit

cooling air to circulate through the module. When relay rack mounted along with

other

heat generating equipment, adequate clearance should be provided to allow for

sufficient air flow through both the perforated top and bottom covers of the NIM bin.

Setting the Amplitude

The Pulse Height potentiometer controls the amplitude of the output pulse, with a

range of 0 to ±10 volts open circuit (0 to ±5 volts, terminated into 50 ohms).

Normalizing the Output

The Norm control allows a 2.5:1 variation of the output amplitude for normalization

of the Pulse Height dial, enabling the user to calibrate the Pulse Height dial directly

in terms of equivalent energy.

CAL

Setting the Norm control fully clockwise to the CAL position provides a calibrated 0

to ±10 volt output range.

The Rate Control

The Rate control adjusts the frequency of the Output signal.

814FP Pulser User’s Manual – 9232092D 3

Chapter 3Pulser Operation

Rate Multiplier and Decay Selector

In the Tail Pulse mode, the Decay switch selects one of three decay constants: 1 ms,

50 μs or 100 μs.

This switch also selects the multiplier for the RATE control: X10, X100 or X200.

Square waves may be selected on any range.

Selecting the Output Mode

To select the output mode, set this switch to either the Tail Pulse position or the

Square Wave position.

Attenuating the Output

The Attenuator switches reduce the full scale pulse height by factors of 2, 5, or 10, or

any combination of these values.

4 814FP Pulser User’s Manual – 9232092D

Input

A. Specifications

Input

DISABLE – Accepts a dc control signal which enables or disables the pulser output

signal. Internally selectable as active Hl (>2 V to disable; <1.5 V to enable) or active

LO (<1.5 V to disable; >2 V to enable). The DISABLE signal is synchronized to the

internal pulse generator to terminate the current pulse at the correct time to prevent

erroneous outputs; rear panel BNC.

Outputs

OUT – Provides attenuated positive or negative tail pulses or square waves; pulse

height 0 to ±10 V open circuit (0 to ±5 V when terminated into 50 Ω); rise time <30

ns; fall time constants are independent of output terminations. Attenuation factors of

up to 1000 may be selected; Zout = 50 Ω; front panel BNC.

SYNC – Provides positive- and negative-going pulses for oscilloscope triggering.

Positive oscilloscope triggering syncs on the leading edge of the output waveform,

while negative oscilloscope triggering syncs on the trailing edge of the output

waveform. Sync pulses are approximately ±3.5 V, 0.1 µs wide; Zout = 50 Ω; front

panel BNC.

Controls

PULSE HEIGHT – Front panel ten-turn potentiometer controls output pulse

amplitude from 0 to ±10 V, open circuit (0 to ±5 V when terminated into 50 Ω.)

NORM/CAL – Front panel multi-turn potentiometer allows a >2:1 variation of the

output amplitude for normalization of the PULSE HEIGHT dial, enabling the user to

calibrate the PULSE HEIGHT dial directly in units of energy. Setting the NORM

control fully clockwise to the CAL position provides a calibrated 0 to ±10 V output

range.

RATE – Front panel ten-turn potentiometer and dial provides control of output

frequency with a 100:1 range.

DECAY – Front panel three-position toggle switch selects one of three decay

constants in Tail Pulse mode and multiplier for the RATE control. Maximum

frequency is 2 kHz for the 50 µs decay constant, 1 kHz for the 100 µs decay constant,

and 100 Hz for the 1 ms decay constant. The Square Wave output may be selected on

any range.

POLARITY – Front panel two-position toggle switch selects POSitive or NEGative

output pulse polarity.

814FP Pulser User’s Manual – 9232092D 5

Appendix ASpecifications

Tail Pulse/OFF/Square Wave – Front panel three-position toggle switch selects the

pulser’s operating mode: OFF disables the output (overrides the rear-panel

DISABLE input) and sets the output to 0 V; the Tail Pulse position outputs a tail

pulse; the Square Wave position outputs a square wave.

ATTENUATOR – Four front panel two-position toggle switches select attenuation

factors of 2, 5, 10 and 10. Total attenuation is the product of the selected attenuators.

DISABLE – Internal jumper selects DISABLE Hl (>2 V) or DISABLE LO (<1.5 V)

mode for rear panel DISABLE input.

Indicators

ON – Front panel LED illuminates when the Tail Pulse/OFF/Square Wave switch is

in either the Tail Pulse or Square Wave position and the pulser is not disabled

through the rear panel DISABLE input.

Performance

TEMPERATURE STABILITY – ≤±0.01%/°C.

SUPPLY VOLTAGE STABILITY – ≤+0.01% for a ±1% change in the ±24 volt

supply voltages.

NORMALIZE RANGE – >2:1.

SWITCHING TRANSIENTS – ≤0.1 V peak-to-peak, ≤20 ns duration. INTEGRAL

NONLINEARITY – ≤±0.25% of full scale.

DUTY CYCLE – 50% with square wave output selected.

RISE TIME – <30 ns.

FALL TIME – Tail Pulse output: 50 µs, 100 µs or 1 ms, (±10%) selected by front

panel switch and independent of output termination; Square Wave output: <30 ns.

PULSE REPETITION RATE – Range depends on the selected DECAY time: 50 µs:

20 Hz to 2 kHz; 100 µs: 10 Hz to 1 kHz; 1 µs: 1 Hz to 100 Hz; the Square Wave

output can be chosen at any range.

Power Requirements

+24 Vdc – 130 mA +12 V dc – 60 mA

–24 V dc – 130 mA –12 V dc – 80 mA

6 814FP Pulser User’s Manual – 9232092D

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