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Summary of Contents for ORTEC 673
- Page 1 Model 673 Spectroscopy Amplifier Gated Integrator Operating and Service Manual ® Printed in U.S.A. ORTEC Part No. 675590 0202 Manual Revision B...
- Page 2 In the event ORTEC fails to manufacture or deliver items called for in this agreement or purchase order, ORTEC’s exclusive liability and buyer’s exclusive remedy shall be release...
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Page 3: Table Of Contents
CONTENTS STANDARD WARRANTY ..............ii SAFETY WARNINGS AND CLEANING INSTRUCTIONS . -
Page 4: 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 5: 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: Indicates a hazard that could result in death or serious bodily harm if the safety instruction is DANGER not observed. -
Page 7: Description
Fig. 1. Example of the Throughput Improvement Using the Gated Integrator Technique. The 673 is two amplifiers in one, having both a distortion of the spectrum in direct proportion to the semi-gaussian unipolar and a gated integrator pulse amplitude or energy. This distortion is most output. -
Page 8: Pole-Zero Cancellation
673 desired, the rear panel connectors can be used to to the analyzer. A BLR (baseline restorer) circuit is connect the 673 to other modules. See Section 3 included in the unit for improved performance at all for further information. - Page 9 Fig. 4. Differentiation in an Amplifier Without Pole-Zero Cancellation. pole-zero cancellation network allows accurate Pole-zero cancellation is accomplished by the cancellation for all preamplifiers having 40 µs or network shown in Fig. 5. The pole [s + (1/T )] due to greater decay times.
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Page 10: Active Filter
22%. The ORTEC active filter discharged at this time, forcing the GI output to network in the 673 amplifier provides the fourth zero. The total processing time is determined as waveform in Fig. 6; this waveform has characteristics eight to ten times the shaping time constant, . - Page 11 (Fig. 10). The resulting shorter total processing time improves Fig. 9. Typical Resolution and Baseline Stability vs Counting Rate for the GI Output of the 673 Using 0.25 Shaping Time.
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Page 12: Specifications
Fig. 10. Typical Resolution and Baseline Stability vs Counting Rate for the Unipolar (Semigaussian) Ouput of the 673 Using 2 µs Shaping Time. 2. SPECIFICATIONS 2.1. PERFORMANCE Output Time Dead Resolution Constant Time Throughput GAIN RANGE Continuously adjustable, X1 through X1500. -
Page 13: Inputs
The 673 operates on power that must be furnished heating of the components that are used in the 673. from a NIM-standard bin and power supply such as The temperature of the equipment mounted in the ORTEC 4001/4002 Series. -
Page 14: Connection To Power
When the 673 is used with a remotely located 3.2. CONNECTION TO POWER preamplifier (i.e., preamplifier-to-amplifier connection The 673 contains no internal power supply and through 25 ft or more of coaxial cable), be careful must obtain the necessary dc operating power from... -
Page 15: Shaping Considerations
The combination is most effective, but this reduces the output noise of the 673 with a voltmeter as each the amount of signal strength at the receiving end shaping time constant is selected. -
Page 16: Shorting Or Overloading The Amplifier Outputs
For the combination of series and shunt termination, sensed in the 673, and the pulse can then be used use the 93 output on the rear panel of the 673 and to prevent the analyzer from measuring and storing use 93 cable. -
Page 17: Inputs
+5 V logic pulse for the duration that the input pulse exceeds the baseline restorer discriminator level. Connect to the ORTEC MCA Busy Input for dead time correction. Fig. 11. Typical Effects of Shaping-Time Selection on Output Waveforms UNI INH Rear panel BNC with Z <... -
Page 18: Standard Setup Procedure
Connect the preamplifier power cable to the Preamp power connector on the rear panel of the 673. Turn on power in the bin and power supply and allow the electronics of the system to warm up and stabilize. - Page 19 Set up the system as for normal operation, including detector bias. b. Set the 673 controls as for normal operation; this includes gain, shaping, and input polarity. Fig. 13. A Clamp Circuit that Can Be Used to Prevent c.
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Page 20: Blr Threshold Adjustment
µs/cm horizontal deflection. Trigger oscilloscope with the Busy output from the 673. d. Reduce the control setting until the baseline discriminator begins to trigger on noise; this corresponds to about 200 counts/s from the Busy output. Adjust the trigger level according to the information in Fig. -
Page 21: Operation With Semiconductor Detectors
4.9. OPERATION WITH SEMICONDUCTOR DETECTORS CALIBRATION OF TEST PULSER An ORTEC 419 Precision Pulse Generator, or equivalent, is easily calibrated so that the maximum pulse height dial reading (1000 divisions) is equivalent to a 10 MeV Fig. - Page 22 The amplifier noise-resolution spread can be measured directly with a pulse height analyzer and the mercury pulser as follows: a. Select the energy of interest with an ORTEC 419 Precision Pulse Generator. Set the amplifier and Fig. 19. System for Detector Current and Voltage biased amplifier gain and bias level controls so that Measurements.
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Page 23: Operation In Spectroscopy Systems
Since natural alpha radiation occurs only above and the size and quality of the detector). Reasonable several MeV, an ORTEC 444 Biased Amplifier is care is required to obtain such results. Some used to suppress the unused portion of the guidelines for obtaining optimum resolution are: spectrum;... -
Page 24: Other Experiments
4.11. OTHER EXPERIMENTS Block diagrams illustrating how the 673 and other ORTEC modules can be used for experimental setups for various other applications are shown in Fig. - Page 25 Fig. 25. General System Arrangement for Gating Control. Fig. 26. Gamma-Ray Charged-Particle Coincidence Experiment.
- Page 26 Fig. 27. Gamma-Ray Pair Spectroscopy. Fig. 28. Gamma-Gamma Coincidence Experiment.
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Page 27: Maintenance
Connect a positive pulser output to the 673 Input the positive amplifier output to cause a null point and adjust the pulser to obtain +10 V at the 673 that can be measured with excellent sensitivity. The Unipolar output. This should require an input pulse pulser output must be varied between 0 and 10 V, of 6.6 mV using a 100... -
Page 28: Suggestions For Troubleshooting
TROUBLESHOOTING In situations where the 673 is suspected of a Note: All voltages measured with no input signal, malfunction, it is essential to verify such malfunction... - Page 29 *16 +12 V Coaxial 12 V Coaxial Spare bus Coaxial Reserved bus *41 117 V ac (neutral) Spare *42 High-quality ground Spare Ground guide pin Reserved Pins marked (*) are installed and wired in ORTEC’s 4001A and 4001C Modular System Bins.
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