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Preamp Fall Time Matching

Pole/zero compensation is critical when using resistive feedback preamplifiers.
Pole/zero compensation must be readjusted whenever the shaping time is changed or
when the 2016 is connected to a different detector. Refer to “Pole/Zero Matching” on
pages 37 and 39 for instructions on adjusting the pole/zero compensation.

When a reset type preamp is used, pole/zero compensation is not required and the con-
trol must be set fully counterclockwise (infinity).

9

Preamp Fall Time Matching

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Summary of Contents for 2016

Page 1: ...Model 2016 Amplifier TCA User s Manual 9231145C 7 01...

Page 2: ...ight conventions No material in this manual may be reproduced published translated distributed or displayed by any means without written permission from Canberra Industries The information in this man...

Page 3: ...Internal Controls 5 Amplifier Board 5 TCA Board 6 3 Amplifier Operation 7 Hardware Installation 7 Preventive Maintenance 7 Amplifier Setup 8 Preamp Fall Time Matching 9 4 Operation With ADC and MCA 10...

Page 4: ...tage Stabilizer 26 Active Filters 26 Unipolar Output 26 Baseline Restorer 26 Restorer Gate Auto Threshold and Auto Rate 27 Fast Discriminator 27 Bipolar Amplifier and Crossover Timing 27 Inhibit Input...

Page 5: ...r Mode 41 Amplifier Shaping Selection 41 Operation With Reset Preamps 42 P Z Compensation With Reset Preamps 42 Using the Reset Preamp Inhibit Signal 43 Triangular Shaping 43 ICR Threshold Adjustment...

Page 6: ...e been used extensively in x ray and gamma ray spectroscopy The shaping time constants have been selected to enhance the throughput rate The 2016A offers higher throughput rate while the 2016B has lon...

Page 7: ...re accomplished via the ICB from an AIM The ICB can address up to 16 slave devices from a single AIM which acts as a master Thus a typical 13 element detector array system will use a sin gle AIM to ad...

Page 8: ...Front Panel Controls This is a brief description of the front panel controls and connectors For more detailed information refer to Appendix A Specifications 3 Front Panel Controls Figure 1 Front Pane...

Page 9: ...Rear Panel Connectors This is a brief description of the rear panel connectors For more detailed information refer to Appendix A Specifications 4 Controls and Connectors Figure 2 Rear Panel Connectors...

Page 10: ...a brief description of the jumper controls on the Amplifier board the jumpers are shown in their factory default positions For more detailed information refer to Appendix A Specifications 5 Internal...

Page 11: ...position JP5 or position JP6 For proper operation of this unit this voltage range jumper must not be moved There should be no jumpers installed in positions JP1 JP2 JP3 and JP4 these posi tions are f...

Page 12: ...erature is between 0 C and 50 C 120 F max Perforations in the top and bottom sides permit cool ing air to circulate through the module When relay rack mounted along with other heat generating equipmen...

Page 13: ...mined by SW1 are channel number 10 ICB 16 1 or 1 16 0 F 1 When more than 16 modules are required two AIMs are needed The addresses from the first AIM which would also include other non Amplifier TCA m...

Page 14: ...ever the shaping time is changed or when the 2016 is connected to a different detector Refer to Pole Zero Matching on pages 37 and 39 for instructions on adjusting the pole zero compensation When a re...

Page 15: ...ment Control Bus ICB All 2016 Selected SCA Outputs are connected to an ADC Gate Input The 2016 Selected Amp Output is connected to an ADC Input With the ADC configured for Delayed Peak Detect the 2016...

Page 16: ...n the SCA s Output pulse Refer to ADC Peak Detect Adjustment on page 44 for the procedure to be followed Spectroscopy Operation Please refer to your MCA user s manual for specific MCA operating instru...

Page 17: ...y two 2016 modules per system configuration Starting the Genie VMS Software The 2016 s software is started from the Spectroscopy Assistant s pulldown menu Calibration Procedure The calibration procedu...

Page 18: ...datasource in an MCA View Control window reset the calibration information for the detector input clear it and start acquisition Now the screen shown in Figure 8 will be displayed Adjust the selected...

Page 19: ...adjustments or if you d rather begin the calibration process If ADJUST is pressed you ll be returned to the screen shown in Figure 8 to enter more adjustments If CALIBRATE is pressed the values will b...

Page 20: ...outputs from all channels are matched Once this is done SCA window settings can be changed by entering new values and using the apply to all check box to select different energies Performing the Gain...

Page 21: ...causing the RDY LED on the selected module to start blinking 4 When the normalization is complete press Ok to return to the screen in Figure 7 and select another channel to normalize TCA Window Setup...

Page 22: ...e 12 which displays the parameters for the selected 2016 s three SCAs Download Setup Values This menu item lets you download setup values as entered in the TCA Window Setup procedure described above t...

Page 23: ...number 1 is at ICB address 0 5 The software is designed to accommodate a maximum of thirty two 2016 modules per system configuration Starting the Software To run the 2016 Setup software Genie 2000 Cli...

Page 24: ...ed by the energy range times 10 volts For example using the 5 9 keV x ray peak from 55 Fe and assuming an energy range of 10 keV one would adjust each amplifier to 5 9 keV 10 keV 10 volts which equate...

Page 25: ...trol MVC window as shown in Figure 15 Only one SCA is needed to properly calibrate a given 2016 module centroid width values for all three SCA s can be defined adjusted later using the TCA Window Setu...

Page 26: ...the expected FWHM is 150eV set the width to 0 300keV d Enable the output for SCA 1 by checking the check box this is selected by default when this screen is presented Note also that the Apply to all...

Page 27: ...el to accommodate small differences in ADC SCA peak detect timing Gain Normalization Procedure The gain normalization procedure provides for gain adjustments to ensure that the am plifier outputs from...

Page 28: ...ation is complete you can run the TCA Window Setup proce dure 1 Select TCA Window Setup form the 2016 Amp TCA software main menu 2 The TCA setup proceeds as before When the screen in Figure 18 appears...

Page 29: ...ameters from the 2016 Amp TCA Software main menu 2 The procedure starts with Figure 14 and proceeds to the screen shown in Figure 19 which displays the parameters for the selected 2016 s three SCAs Do...

Page 30: ...this stage drives the pole zero circuit and the first differentiator Differentiator and Gain Stages The input amplifier s output signal is differentiated by C13 through C18A and resistor R25 schemati...

Page 31: ...r output amplifier includes a single pole filter provided by feedback resistor R163 and capacitors C81 through C86 the time constant is selected by the shaping switch For Gaussian shaping the unipolar...

Page 32: ...t rate given by a front panel LED The SCA uses the output from the Fast Discriminator FDO to de termine if multiple inputs are received during a pulse processing sequence If pileup reject PUR is enabl...

Page 33: ...y the FPGA with values it receives from the ICB Each dual DAC is loaded by sending it 24 clock pulses SCLK that shift in a data code on DIN the accompanying chip select CSn determines which of the thr...

Page 34: ...is signaled an SCA pulse can be generated An important point to note is that as count rates increase it is likely that some pulses may not cause an LLD crossing because the previous pulse has not fal...

Page 35: ...crossing then a Peak detec tion without a ULD Assuming that all of the inputs meet these prior conditions 1 Peak signals 1 and 2 will cause an SCA pulse because there was only a single Fast Discrimina...

Page 36: ...rivers The logic pulses developed in the FPGA are brought through a plug in buffer board Three types of boards can be inserted in the 2016 Fast NIM negative pulse TTL TTL with 50 drive 31 Triple Chann...

Page 37: ...red dc level factory calibrated to 0 5 mV Zout 1 or 93 internally selectable short circuit protected front panel BNC SELECTED AMP Provides positive computer selected linear actively filtered shaped pu...

Page 38: ...s intensity is count rate dependent Pileup Rejector PULSE PAIR RESOLUTION 250 ns MINIMUM DETECTABLE SIGNAL Limited by detector preamp noise characteris tics PUR Threshold Auto or Manual Adjust mode c...

Page 39: ...itch provides 0 125 0 25 0 5 1 2 and 3 s shaping time constant SHAPING MODE 2016B Six position rotary switch provides 0 25 0 5 1 2 4 and 6 s shaping time constant ICR THRESH Multi turn screwdriver pot...

Page 40: ...ns using 0 125 s shaping Power Requirements 24V dc 100 mA 12 V dc 175 mA 6 V dc 350 mA 24 V dc 120 mA 12 V dc 130 mA 6 V dc 200 mA Physical SIZE Standard single width NIM module 3 43 x 22 12 cm 1 35 x...

Page 41: ...L SCA Output SHAPING 2016A 1 Fast NIM Driver 0 125 s 3 0 s 2016A 2 TTL 0 125 s 3 0 s 2016A 3 TTL 50 0 125 s 3 0 s 2016B 1 Fast NIM Driver 0 250 s 6 0 s 2016B 2 TTL 0 250 s 6 0 s 2016B 3 TTL 50 0 250 s...

Page 42: ...ming the following manual P Z matching adjustments set the scope s ver tical sensitivity to 50 mV div and use a clamp box such as the Canberra Model LB1502 Schottky Clamp Box to view the unipolar sign...

Page 43: ...Figure 22 the AMP OUT signal should have a clean return to baseline with no bumps overshoots or undershoots 38 Performance Adjustments Figure 22 Correct Pole Zero Compensation Figure 23 Undercompensa...

Page 44: ...e wave generator for a frequency of approximately 1 kHz 4 Connect the square wave generator s output to the Preamp s TEST INPUT 5 Remove all radioactive sources from the vicinity if the Detector 6 Usi...

Page 45: ...r decay time constant As illustrated in Figure 25 the unipolar output signal should have a clean baseline with no bumps overshoots or undershoots 40 Performance Adjustments Figure 25 Correct Pole Zero...

Page 46: ...erior high performance for high resolution Ge spectroscopy Amplifier Shaping Selection Shaping time constant selection generally is a compromise between optimizing throughput and resolution For german...

Page 47: ...ote The P Z matching must be recalibrated each time the shaping is changed Operation With Reset Preamps The Model 2016 is fully compatible with most reset type preamps These include the Model 2101 Tra...

Page 48: ...tky Clamp Box connect the Amp Out signal to one of the scope s inputs 3 Connect the Inhibit signal to the scope s other input 4 Trigger the scope on the leading edge of the Inhibit signal 5 Adjust the...

Page 49: ...the PUR is off or red if the PUR is on 3 Adjust the control clockwise until the indicator blinks occasionally 4 The PUR threshold is now properly set Note With PUR Auto Threshold disabled the PUR Thr...

Page 50: ...near the channel selected for the Conversion Gain For example with a Conver sion Gain of 2K the ADC will nominally convert a full scale 10 V pulse at channel 2020 20 channels But as the amplifier s p...

Page 51: ...normally be the highest energy peak 8 Now calibration steps 3 through 6 can be repeated for the remaining Amplifier TCA modules or alternatively to perform a Gain Normalization 9 The Gain Normalizatio...

Page 52: ...after the standard Genie VMS 0198start procedure is called nd_library 0913start com To use the software immediately you may either reboot the machine or execute the previous command directly from a DE...

Page 53: ...modules 17 to 32 To create the MCA configurations suitable for use with the AMP TCA software log into the account that will be using the AMP TCA software then execute the first of the two following li...

Page 54: ...pen a DOS Prompt command window and type x setup where x is the floppy drive designator 4 To complete the installation just follow the simple instructions you ll see on the screen Installing the Genie...

Page 55: ...red The first AIM will be used to communicate with 2016 modules 1 16 the second AIM is used for modules 17 32 2 To create the detector input definitions use the MCA Input Definition Editor to define t...

Page 56: ...fects of RFI and EMC on the system However care should be taken to maintain full compliance These considerations include A rack or tabletop enclosure fully closed on all sides with rear door access Si...

Page 57: ...information Your Name _______________________________________ Your Address _______________________________________ _______________________________________ _______________________________________ ____...

Page 58: ...r modified without our written permission or damage which has been caused by abuse misuse accident or unusual physical or electrical stress as determined by our Service Personnel We are under no oblig...

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