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Summary of Contents for Advanced Measurement Technology 142AH
- Page 1 Model 142AH Preamplifier Operating and Service Manual ® Printed in U.S.A. ORTEC Part No. 733990 0202 Manual Revision B...
- Page 2 Copyright © 2002, Advanced Measurement Technology, Inc. All rights reserved. ® *ORTEC is a registered trademark of Advanced Measurement Technology, Inc. All other trademarks used herein are the property of their respective owners.
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Page 3: Table Of Contents
CONTENTS WARRANTY ............... ii SAFETY INSTRUCTIONS AND SYMBOLS . -
Page 4: Safety Instructions And Symbols
SAFETY INSTRUCTIONS AND SYMBOLS This manual contains up to three levels of safety instructions that must be observed in order to avoid personal injury and/or damage to equipment or other property. These are: DANGER Indicates a hazard that could result in death or serious bodily harm if the safety instruction is not observed. -
Page 5: Safety Warnings And Cleaning Instructions
SAFETY WARNINGS AND CLEANING INSTRUCTIONS 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. - Page 6 The Warranty on the 142AH batteries for bias. This situation leaves no is void if the protection circuit is taken out unless...
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Page 7: Description
It can operate with higher capacitances that system stability. are slightly degraded. The 142AH has a low-noise intercept and a moderate slope. An internal rise time compensation adjustment is accessible through a hole in the case of the unit. -
Page 8: Specifications
1.73 2.23 3.25 Typical intercept, 1.55 keV. Typical slope, 17 eV/pF. Fig. 2.1. 142AH Typical Noise (0.5 RISE TIME Based on a +0.5-V signal through the E output into a 93 circuit and measured from 2.3. OUTPUTS 10% to 90% of peak amplitude; rise time adjustment optimized;... -
Page 9: Electrical And Mechanical
Power for the 142AH Preamplifier is supplied through the captive power cord and 9-pin After the input cable has been installed, the Amphenol connector. -
Page 10: Test Pulse
Operating bias for the detector is supplied to the Bias connector on the 142AH and through a filter 5. In laboratory areas that are particularly dusty, and large bias resistance to the Input signal this procedure may have to be repeated several connector. -
Page 11: Operation
Figure 4.1 is a simplified block diagram of the that no degradation of noise performance will circuits in the 142AH Preamplifier. When the result when the required bias voltage is applied. protection circuit is in, the diode between the two... -
Page 12: Energy Output
Fig. 4.1. Simplified Block Diagram of the ORTEC 142AH Preamplifier. The corona blower that is furnished with the completely. The stray capacity is about 0.1 to 0.2 142AH can be used to flush the interior connector pF. If less conversion gain is desired, the value of... -
Page 13: Compensation Adjustment
142AH. This control can be adjusted through the bottom of the case capacity, control readjustment is necessary so without opening the unit. -
Page 14: Input Protection
In order to take full advantage of the rise time 4.6. INPUT PROTECTION capabilities of the 142AH for timing experiments (typical rise times of 4 to 10 ns for detector A provision is built into the preamplifier to protect capacities of 1 to 100 pF), the total cable length... -
Page 15: Maintenance Instructions
This is usually no problem provided that input 2. Using a calibrated pulser, the 142AH E output attenuators, if any, on the main amplifier are set should be inverted from the input polarity and for minimum attenuation. -
Page 16: Cleaning
10. Use an ORTEC 419 Precision Pulse Generator with a matched charge termination to measure the rise time of the 142AH through the T (timing) or E (energy) output. Connect the 419 output through the charge terminator to the Input...
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