ORTEC 572A, Operating And Service Manual

Page 1: ...Model 572A Spectroscopy Amplifier Operating and Service Manual Printed in U S A ORTEC Part No 785100 0904 Manual Revision D...

Page 2: ...nbeassignedtotheunit Also ORTECmust 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...

Page 3: ...NS 7 3 7 SHORTING OR OVERLOADING THE AMPLIFIER OUTPUTS 8 3 8 INHIBIT OUTPUT CONNECTION 8 3 9 BUSY OUTPUT CONNECTION 8 3 10 CRM OUTPUT CONNECTION 8 4 OPERATING INSTRUCTIONS 8 4 1 INITIAL TESTING AND OB...

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: ...m 100 mV to 100mV Thisoutputpermitstheuse of the direct coupled input of the analyzer with a minimum amount of interface problems The 572A bipolar output may be preferable for spectroscopy when operat...

Page 8: ...seline with the preamplifier time constant The pole zero adjust is accessible from the front panel of the 572A and can easily be adjusted by observing the baselinewithanoscilloscopewithamonoenergetic...

Page 9: ...3 Fig 1 1 Differentiation in an Amplifier Without Pole Zero Cancellation Fig 1 2 Differentiation in a Pole Zero Canceled Amplifier...

Page 10: ...o 5OEC CROSSOVER WALK 3 ns for 50 1 dynamic range includingcontributionofORTEC551or552 Constant FractionTimingSingle ChannelAnalyzer using 50 fraction and 0 5 s shaping COUNT RATE STABILITY The1 33MeV...

Page 11: ...iometeradjuststheunipolar output baseline dc level range 100 mV to 100 mV 2 3 INPUT INPUT Type BNC front and rear panel connectors accept either positive or negative pulses with rise times in the rang...

Page 12: ...e pole zero adjustment see Section 4 6 An alternatemethodisaccomplishedeasilybyusinga monoenergetic source and observing the amplifier baseline with an oscilloscope after each pulse under approximatel...

Page 13: ...h shaping time constant is selected The 572A provides both unipolar and bipolar outputs Theunipolaroutputpulsesshouldbeused in applications where the best signal to noise ratio resolution is most impo...

Page 14: ...e pileup is sensed in the 572A and the pulse can then be used to prevent the Analyzer from measuring and storing a false amplitude The signal is dc coupled and rises from 0toabout 5Vforatimeequalto6 s...

Page 15: ...lates the threshold of the BLR gate according to the output noise level The Threshold setting permits manual control of the BLR gate threshold usingthescrewdrivercontrolimmediatelybelowthe toggle swit...

Page 16: ...on power in the Bin and Power Supply and allow the electronics of the system to warm up and stabilize b Set the 572A controls initially as follows Shaping 2 s Coarse Gain 50 Gain 1 000 Internal Jumper...

Page 17: ...of the preamplifier Adjusttheattenuatorsothatthe572A output amplitude is about 9 V d Observe the unipolar output of the 572A with an oscilloscope triggered from the 572ABusyoutput Adjust the PZ Adj co...

Page 18: ...tal deflection Trigger the oscilloscope with the Busy output from the 572A d Reduce the control setting until the baseline discriminator begins to trigger on noise this corresponds to about 200 counts...

Page 19: ...r for the same pulse height as the pulse obtained in stepc LocktheNormalizecontrolanddonotmove it again until recalibration is required The pulser is now calibrated the Pulse Height dial read directly...

Page 20: ...capacitance decreases thus reducing the resolution spread The overall resolution spread will depend upon which effect is dominant Figure4 7showscurvesoftypicalnoise resolution spread versus bias volt...

Page 21: ...PECTROSCOPY SYSTEMS HIGH RESOLUTION ALPHA PARTICLE SPECTROSCOPYSYSTEM Theblockdiagramof a high resolution Spectroscopy system for measuringnaturalalphaparticleradiationisshown in Fig 4 11 Alpha partic...

Page 22: ...ounters operated at high gas amplification tend to degrade the resolution capabilities drastically at x ray energies even at relatively low counting rates By using a high gain low noise amplifying sys...

Page 23: ...17 Fig 4 13 Scintillation Counter Gamma Spectroscopy System Fig 4 14 High Resolution X Ray Energy Analysis System Using a Proportional Counter Fig 4 15 General System Arrangement for Gating Control...

Page 24: ...18 Fig 4 16 Gamma Ray Charged Particle Coincidence Experiment Fig 4 17 Gamma Ray Pair Spectrometry...

Page 25: ...ant of 0 5 1 2 3 6 or 10 s The amplifier produces the fastshapedpulsefromthesamepreamplifierinput pulse and this triggers discriminator IC12 set just above the noise level The discriminator response t...

Page 26: ...20 Fig 5 1 Amplifier Block Diagram...

Page 27: ...ackard 3400A RMS Voltmeter 6 2 PULSER TEST1 Coarse Gain 1K Gain 1 5 Input Polarity Positive Shaping Time Constant 1 s BLR PZ Adj Variable control Fully CW for 300 mV a Connect a positive pulser output...

Page 28: ...y to vary the PZ Adj control on the front panel in order to cancel the pulser pole and minimize the time required for return to the baseline Increasethepulseroutputamplitudeto1000times the setting tha...

Page 29: ...rvations 6 4 FACTORY REPAIR This instrument can be returned to the ORTEC factoryforserviceandrepairatanominalcost Our standard procedure for repair ensures the same quality control and checkout that a...

Page 30: ...served 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 neu...