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DANGER

Opening the cover of this instrument is likely to expose dangerous voltages. Disconnect the
instrument from all voltage sources while it is being opened.

WARNING Using this instrument in a manner not specified by the manufacturer may impair the

protection provided by the instrument.

CAUTION To prevent moisture inside of the instrument during external cleaning, use only enough liquid

to dampen the cloth or applicator.

SAFETY WARNINGS AND CLEANING INSTRUCTIONS

Cleaning Instructions

To clean the instrument exterior:

!

Unplug the instrument from the ac power supply.

!

Remove loose dust on the outside of the instrument with a lint-free cloth. 

!

Remove remaining dirt with a lint-free cloth dampened in a general-purpose detergent and water
solution. Do not use abrasive cleaners.

!

Allow the instrument to dry completely before reconnecting it to the power source.

Summary of Contents for 142PC

Page 1: ...Model 142PC Preamplifier Operating and Service Manual Printed in U S A ORTEC Part No 717600 1202 Manual Revision B...

Page 2: ...n so that a Return Authorization Number can be assigned to the unit Also ORTEC must be informed either in writing by telephone 865 482 4411 or by facsimile transmission 865 483 2133 of the nature of t...

Page 3: ...2 2 5 ELECTRICAL AND MECHANICAL 2 3 INSTALLATION 3 3 1 CONNECTION TO PROPORTIONAL COUNTER 3 3 2 CONNECTION TO AMPLIFIERS 3 3 3 INPUT POWER 3 3 4 TEST PULSE 3 3 5 DETECTOR BIAS INPUT 4 4 OPERATION 4 4...

Page 4: ...iv...

Page 5: ...e Input connector on the preamplifier 2 Discharge the bias circuitry before making any connections to the Input connector and before disconnecting the preamplifier from the proportional counter 3 To d...

Page 6: ...a hazard that could result in bodily harm if the safety instruction is not observed CAUTION Indicates a hazard that could result in property damage if the safety instruction is not observed Please re...

Page 7: ...the instrument during external cleaning use only enough liquid to dampen the cloth or applicator SAFETY WARNINGS AND CLEANING INSTRUCTIONS Cleaning Instructions To clean the instrument exterior Unplug...

Page 8: ...viii...

Page 9: ...y long cable lengths can be used between the proportional counter and the preamplifier without disrupting the system stability An internal risetime compensation adjustment is accessible through a hole...

Page 10: ...rtional counter BIAS Accepts the bias voltage for the proportional counter from a bias supply TEST PULSE Accepts input voltage pulses from a pulse generator for instrument and system check and calibra...

Page 11: ...ther the E or T output connector is not being used it should simply be left open circuited unterminated 3 3 INPUT POWER Power for the 142PC is supplied through the Power Cable that is captive through...

Page 12: ...should be furnished with the bias supply module 4 OPERATION 4 1 GENERAL When the 142PC is installed according to the appropriate information in Section 3 it operates at all times when power is applie...

Page 13: ...The energy output signal from the preamplifier is a fast risetime voltage step with an exponential return to the baseline in about 75 s The polarity of signals through the E output is inverted from t...

Page 14: ...timing experiments typical risetimes of 25 to 150 ns for detector capacities from 1 to 100 pF the total cable length should be kept as short as possible even though it is terminated Due to vagaries i...

Page 15: ...ue only to the noise contribution of the preamplifier and main amplifier The analyzer can be calibrated in terms of keV per channel by observing two different pulser peaks of known energy and the FWHM...

Page 16: ...hed charge termination to measure the rise time of the 142PC through the T or E output connector Connect the 419 output through the charge terminator to the input of the 142PC and use an oscilloscope...

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