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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 142A

Page 1: ...Models 142A 142B and 142C Preamplifiers Operating and Service Manual Printed in U S A ORTEC Part No 627990 1202 Manual Revision D...

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: ...ON 4 3 1 CONNECTION TO DETECTOR 4 3 2 ENERGY OUTPUT CONNECTION TO MAIN SHAPING AMPLIFIER 4 3 3 TIMING OUTPUT CONNECTION TO TIMING MODULES 4 3 4 INPUT OPERATING POWER 4 3 5 TEST PULSE 4 3 6 DETECTOR BI...

Page 4: ...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 5: ...he 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 6: ...e device to the Detector Input connector on the preamplifier 2 Discharge the detector bias circuitry before making ANY connections to the Detector Input connectorand before disconnecting the preamplif...

Page 7: ...ults however the T output should be terminated in 50 S when not in use A bias circuit is included to accept the operating voltage required by the surface barrier detector The bias input circuit in the...

Page 8: ...42B Nominally 20 mV MeV 142C Nominally 20 mV MeV ENERGY RANGE 142A 0 200 MeV 142B 0 400 MeV 142C 0 400 MeV RISE TIME 0 to 0 5 V Pulse at E output on 93S Load Fig 2 3 142A 5 ns at 0 pF 12 ns at 100 pF...

Page 9: ...s a differentiated output signal compatible with typical 50 S timing system requirements polarity is the same as the input pulse polarity Fig 2 4 2 4 CONNECTORS INPUT TEST E AND T BNC UG 1094 U BIAS S...

Page 10: ...y is also used to furnish the preamplifier power requirements that are available on all ORTEC main amplifiers 3 3 TIMING OUTPUT CONNECTION TO TIMING MODULES The T output of the preamplifier can be use...

Page 11: ...leakage current is small R3 should not be installed in the circuit because it would tend to degrade the noise performance 4 2 DETECTOR BIAS The amount of bias required by the detector is specified in...

Page 12: ...from the signal polarity at the detector output When the normal positive bias polarity is used for the detector the detector output pulses are negative and the E output of the preamplifier is positive...

Page 13: ...the 142C the adjustment has been made for 400 pF For optimum results for other input capacities the control should be adjusted under actual operating conditions If the control has been adjusted for op...

Page 14: ...alent energy The timing outputs should have the same polarity as the inputs with a scale factor of about 20 less than the signals through the E outputs 3 The noise contribution of the preamplifier may...

Page 15: ...eV 7 The noise performance of the preamplifier as measured by these methods should not differ significantly from that given in the specifications in Section 2 8 lf during testing of the preamplifier a...

Page 16: ...AIR This instrument can be returned to ORTEC for service and repair at a nominal cost Our standard procedure for repair ensures the same quality control and checkout that are used for a new instrument...

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