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Model 142IH

Preamplifier

Operating and Service Manual

Printed in U.S.A.

 ORTEC

®

 Part No. 717590

 1202

Manual Revision C

Summary of Contents for 142IH

Page 1: ...Model 142IH Preamplifier Operating and Service Manual Printed in U S A ORTEC Part No 717590 1202 Manual Revision C...

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: ...TS 3 2 4 CONNECTORS 3 2 5 ELECTRICAL AND MECHANICAL 3 3 INSTALLATION 3 3 1 CONNECTION TO DETECTOR 3 3 2 CONNECTION TO AMPLIFIERS 4 3 3 INPUT POWER 4 3 4 TEST PULSE 4 3 5 DETECTOR BIAS INPUT 4 4 OPERAT...

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: ...vi...

Page 7: ...ry before connecting a low impedance a cable or any other capacitive device to the Input connector on the preamplifier 2 Discharge the bias circuitry before making any connections to the Input connect...

Page 8: ...resistance on the input so that relatively long cable lengths can be used between the detector and the preamplifier without disrupting the system stability A Test Pulse connector with built in charge...

Page 9: ...t polarity is opposite from the input pulse polarity output pulse polarity is the same as bias polarity 2 4 CONNECTORS INPUT and BIAS Type SHV TEST PULSE E and T Type BNC POWER CABLE 10 ft 3 m captive...

Page 10: ...se for energy calibration can be accepted through the Test Pulse input connector on the 142IH without the use of an external charge terminator The test input of the preamplifier has an input impedance...

Page 11: ...n ORTEC 114 Preamplifier Power Supply Figure 4 1 is a simplified block diagram of the circuits in the 142IH Preamplifier The complete circuit is shown in schematic 142IH 0201 S1 included at the back o...

Page 12: ...amplifier Input 4 4 TIMING OUTPUT The T output connector provides an alternate path for the same output pulses that are furnished through the E output connector The intent is to provide both connectio...

Page 13: ...t shown for zero external capacity In any case the Input connector and capacitors when used should be completely shielded electrically A wrapping of aluminum foil around the Input connector or a shiel...

Page 14: ...d parameters By use of the above equation and with a knowledge of the noise of the preamplifier the noise width of the detector can be determined The significance of this noise width in evaluating the...

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