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4. Operation With ADC and MCA

Figure 5 shows a typical array detector system configured for 2016 Amplifier/TCA
calibration and operation. Each Preamp output is connected to a 2016 Amp Input. SCA
parameters are computer controlled through the Model 556 AIM, utilizing Canberra’s
Instrument 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 Selected SCA controls ADC
conversion, allowing calibration of each 2016 Amplifier/TCA. When calibrating each
2016 Amplifier/TCA module, its SCA energy window is set up and SCA count analy-
sis can begin.

10

Operation With ADC and MCA

Figure 5 Typical 13-Element Array Detector System

Содержание 2016

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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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