Ametek ORTEC 480 User Manual Download

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Model 480

Pulser

Operating and Service Manual

Printed in U.S.A.

ORTEC

®

Part No. 733390

0815

801 South Illinois Avenue

Manual Revision C

Oak Ridge, Tennessee 37830
United States of America

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Summary of Contents for ORTEC 480

Page 1: ...Model 480 Pulser Operating and Service Manual Printed in U S A ORTEC Part No 733390 0815 801 South Illinois Avenue Manual Revision C Oak Ridge Tennessee 37830 United Statesof America ...

Page 2: ...o 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 the fault of the instrument being returned and of the model serial and revision Rev on rear panel numbers Failure to do so may cause unnecessary delays in getting the unit repaired The ORTEC standard proc...

Page 3: ... 2 2 4 ELECTRICAL AND MECHANICAL 2 3 INSTALLATION 2 3 1 GENERAL 2 3 2 CONNECTION TO POWER 2 4 OPERATION 3 4 1 PANEL CONTROLS 3 4 2 INITIAL TESTING AND OBSERVATION OF PULSE WAVEFORMS 3 4 3 CONNECTOR DATA 3 4 4 TYPICAL OPERATING CONSIDERATIONS 4 5 MAINTENANCE 7 5 1 TESTING PERFORMANCE OF THE PULSER 7 5 2 ADJUSTMENT OF DECAY TIME OF OUTPUT PULSE 8 5 3 TABULATED TEST POINT VOLTAGES 8 5 4 SUGGESTIONS F...

Page 4: ...s 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 read all safety instructions carefully and make sure you understand them fully before attempting to use this product In addition the following symbol may appear on the product ATTENTION Refer to Manual...

Page 5: ...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 ...

Page 6: ...vi ...

Page 7: ...is not possible to overload the Bin Power Supply with a full complement of modules in the Bin However this may not be true when the Bin contains modules of other than ORTEC design All signal levels and impedances are compatible with other modules in the ORTEC 400 Series 1 2 BASIC FUNCTION The 480 provides output pulses that are characterized by a fast rise time and a slow exponential decay time Th...

Page 8: ...r negative dc coupled output with an impedance of 100Ù Direct Front panel BNC connector provides positive or negative dc coupled 0 to 10 V pulse into a high impedance and 0 to 5 V max pulse into 100Ù This is equivalent to a range of 0 to 220 MeV energy referred to a silicon detector when used with associated charge terminator Accessories Included One 100Ù voltage terminator and one charge terminat...

Page 9: ...y to be driven from the ac line The frequency of the ac line will be 50 to 60 Hz Neg Pos The Polarity of the output signal will be either negative or Positive as determined by the setting of this front panel slide switch 4 2 INITIAL TESTING AND OBSERVATION OF PULSE WAVEFORMS See Section 6 1 for test performance data 4 3 CONNECTOR DATA CN 1 The Direct Output BNC connector provides a dc coupled outp...

Page 10: ...divisions is equivalent to a specific MeV loss in a radiation detector The procedure is as follows 1 Connect the detector to be used to the spectrometer system i e preamplifier main amplifier and biased amplifier 2 Allow particles from a source of known energy alpha particles for example to fall on the detector 3 Adjust the amplifier gains and the bias level of the biased amplifier to give a suita...

Page 11: ...llustrated in Fig 4 3 The amplifier noise resolution spread can be measured correctly with a pulse height analyzer and the 480 as follows 1 Select the energy of interest with the 480 and set the linear amplifier and biased amplifier gain and bias level controls so that the energy is in a convenient channel of the analyzer 2 Calibrate the analyzer in keV per channel using the purser Full scale on t...

Page 12: ...st produce a positive Output Pulse The impedance seen from point A to ac or signal ground via point C should be equal to the impedance seen from point A to ac or signal ground via point B The diodes D should be germanium units with high gm The diodes can be replaced with high frequency germanium transistors with the base connected to the collector so that the emitter base functions as the diode Tr...

Page 13: ...ves ensuring that the linear system goes through zero and that the output of the pulse generator is properly terminated The attenuator switches in the 480 have an accuracy controlled by 1 metal film resistors and could be used to digitally check the linearity of the spectrometer In addition to the attenuator accuracy the Pulse Height control has independent integral nonlinearity of 0 25 This contr...

Page 14: ...switched in the output pulse should be between the following limits 9 Set the Polarity switch to Neg There should be no change in amplitude from the Pos position Observe the output with a sweep of 5 msec cm and look for skipping or other erratic behavior of the relay 5 2 ADJUSTMENT OF DECAY TIME OF OUTPUT PULSE As the 480 is normally supplied the decay time of the output pulse is essentially fixed...

Page 15: ...ting instructions of Section 6 1 of this manual and the circuit description in Section 5 are intended to provide assistance in locating the region of trouble and repairing the malfunction The guide plate and shield cover can be completely removed from the module to enable oscilloscope and voltmeter observations with a minimum chance of accidentally short circuiting portions of the etched board The...

Page 16: ...eserved bus 34 Power return ground 13 Spare 35 Reset Scaler 14 Spare 36 Gate 15 Reserved 37 Reset Auxiliary 16 12 V 38 Coaxial 17 12 V 39 Coaxial 18 Spare bus 40 Coaxial 19 Reserved bus 41 117 V ac neutral 20 Spare 42 High quality ground 21 Spare G Ground guide pin 22 Reserved Pins marked are installed and wired in ORTEC s 4001A and 4001C Modular System Bins Bin Module Connector Pin Assignments Fo...

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