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Models 142A, 142B, and 142C

Preamplifiers

Operating and Service Manual

Printed in U.S.A.

ORTEC

®

Part No. 627990

1202

Manual Revision D

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Содержание 142A

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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