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931049D DSPEC-LF User Manual 100% uncompressed for

1. Multiple devices e g 919 Software selectable ADC gate mode SET_GATE Software downloadable firmware Time histogramming functions available e g 9308 Software selectable lower level discriminator Software selectable upper level discriminator MCS mode SCA input available MCS mode positive TTL input available MCS mode fast negative NIM input available MCS mode discriminator input available Software switchable MCS mode discriminator edge Software programmable MCS mode discriminator level Software programmable SCA upper and lower thresholds Software selectable MCS mode input sources Uncertainty statistical preset SET_UNCERT_PRES Features vary by input SHOW_FEATURES depends on device segment multi input MCBs only Software selectable HV shutdown mode SET SHOW VERI_SHUT Software selectable shaping time constants SET_SHAP Explorable shaping time constants SHOW_CONFIG_SHAP Advanced shaping time SET_SHAP_RISE SET_SHAPE_FLAT etc Software selectable BLR ENA DIS SHO_BLR_AUTO SET SHO VERI_BLR Bit 51 32 53 54 55 56 57 58 59 60 6l 62 63 64 65 66 67 68 69 70 71 72 13 74 75 76 77 78 79 80 81 82 83 84 85 86 3 SPECIFICATIONS Meaning SHOW_STATUS command supported returns M record Overflow preset ENA DIS SHO_OVER_PRES Software enabled MicroNOMAD style audio clicker ENA DIS_CLICK Software readable thermistor SHOW_THERM Floating point fine gain SET SHO VERI LIST_GAIN_FINE
2. Responses CORR_FLAT 000000000000000 SHOW_CRM Returns the current reading of the count rate meter Response G0000050781096 Current input count rate is 50781 counts s SHOW_DATA_APPLICATION string If string matches string1 in a previous SET_DATA_ APPLICATION command then string2 from that command is returned The response is a F record SHOW_DATE Returns the day month and year of the current date as maintained in the battery backed up real time clock in the form dddmmmyyy The day is returned as a 3 digit integer number from 001 to 031 month as a 3 digit integer number from 001 to 012 and year as a 3 digit integer number from 000 to 099 See also SET_DATE_START Responses N001001088052 lt CR gt Date reported as Jan 1 1988 N031012099059 lt CR gt Date reported as Dec 31 1999 N001001000036 lt CR gt Date reported as Jan 1 2000 N031012087056 lt CR gt Date reported as Dec 31 2087 56 931049D 0914 4 FIRMWARE COMMANDS AND RESPONSES SHOW_DATE_START Returns the day month and year of the acquisition start date in the form dddmmmyyy The day is returned as a 3 digit integer number from 001 031 month as a 3 digit integer number from 001 012 and year as a 3 digit integer number from 000 099 See also SET_DATE_START Responses N001001088052 lt CR gt Date reported as Jan 1 1988 N031012099059 lt CR gt Date reported as Dec 31 1999 N001001000036 lt CR gt Date reported as Jan 1 2000 N03101208
3. is about twice that indicated by the conventional time constants displayed on the front panel of commercial analog amp lifiers For example germanium detectors co o I Throughput cps thousands E o are often specified at a 6 us time constant 1 5 9 15 20 30 50 75 95 105 120 130 140 this setting is equivalent to 12 us peaking Count Rate Keps rise time in our digital spectrometers Figure 20 An Example of the Tradeoff Between Throughput and Count Rate Up to some value of rise time one can expect improved resolution with increasing rise time there will however be a tradeoff in maxi mum throughput to memory Figure 20 illustrates an example of this tradeoff ORTEC digital spectrometers operate well above the peak of the throughput curve Operating there allows these instruments to handle an even higher rate of incoming counts but with less data into memory and therefore a longer count time to the same detection limit It is possible to move the peak of the curve to the right more counts to memory with higher input count rate by reducing the pulse rise and fall time thereby trading off resolution for maximum count rate Table 2 is a guide to choosing a count rate that will ensure that the most efficient operation of your digital spectrometer over the range of anticipated input count rates for your application that is at or below the throughput peak while achieving the best resolution obtainable from the detecto
4. G2147483647121 lt CR gt Maximum count in an ROI channel is 2147483647 SHOW_PEAK_CHANNEL This command returns the number of the ROI channel with the largest number of counts An ROI channel is a channel that has the ROI flag set The lowest number ROI channel with the largest count is reported if more that one channel contains the largest number of counts Channel 16383 is the highest numbered channel in any device 64 931049D 0914 4 FIRMWARE COMMANDS AND RESPONSES Responses C00000087 lt CR gt Maximum count was found in channel 0 or no ROI channels were found C00001088 lt CR gt Maximum count was found in channel 1 C16382107 lt CR gt Maximum count was found in channel 16382 C16383108 lt CR gt Maximum count was found in channel 16383 SHOW_PEAK_ PRESET Reports the value of the ROI peak preset See SET_PEAK_ PRESET for information about the ROI peak preset Responses G0000000000075 lt CR gt Peak preset disabled G0000000001076 lt CR gt Peak preset set to 1 count G2147483646120 lt CR gt Peak preset set to 2147483646 counts G2147483647121 lt CR gt Peak preset set to 2147483647 counts SHOW_PZ Displays the PZ setting See also SET_PZ Responses PZ_ENA 002200 Pole zero enabled and set to 2200 PZ_DIS 001000 Pole zero disabled and set to 1000 SHOW_PZ AUTOMATIC Shows the state of the automatic PZ See also SET_PZ AUTOMATIC Responses IT lt CR gt Pole zero enabled IF lt CR gt Pole zero di
5. developed programs may read and write the SOH register Chapter 4 provides the commands for reading and interpreting the SOH settings see Appendix A for a table of SOH bit definitions 1 3 Ballistic Deficit and Adjusting the Flattop Duration In germanium detectors it takes a variable amount of time to collect all of the charge released in the detector diode when a gamma ray deposits energy in the detector The duration of this charge collection time depends on the dimensions of the detector the geometry of the electrodes and the points at which energy is deposited in the detector A small planar detector has charge col lection times that vary from 50 ns to 100 ns whereas a large coaxial detector is characterized by charge collection times that vary from 100 ns to 700 ns The variability of the charge collection time within a specific detector is the source of the resolution degradation described by the ballis tic deficit effect The ballistic deficit becomes a significant source of resolution degradation when very short shaping times are selected in order to reduce dead time and improve the high counting rate limit For a digital filter having the shape of a symmetrical triangle in the time domain the output pulse begins to rise as soon as the gamma ray is detected It continues to rise until it reaches a peak amplitude at a time specified by the currently selected rise fall time this is the Rise Time parameter entered on the Amplifier 2 tab
6. e DIM POSNAI For any positive bias Nal detector includes short leads with mating connectors for connecting to existing detector cabling 100 V to 1800 V e DIM 296 For any positive bias Nal detector with Model 296 ScintiPack tube base preamplifier bias supply for Nal detectors with 14 pin 10 stage photo multiplier tubes 0 V to 1200 kV 1 2 3 How State of Health SOH is Monitored The SMART 1 detector SOH function operates as follows When the acquisition is started the DSPEC LF clears all the bits of the SOH byte in the SMART 1 detector memory During data acquisition the SMART 1 monitors the conditions listed above Should any of these values fall outside a specified range even if they subsequently return to normal the relevant SOH bit is set The bits stay set until cleared externally with the Acquire Clear command in MAESTRO or the firmware commands CLEAR CLEAR_ALL or CLEAR_HV_HEALTH At the end of the acquisition the DSPEC LF reads the SOH and if any bit is set displays a warning message DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 If no bits are set no message is displayed this means there was no problem during the acquisi tion The SOH status is saved with the spectral data in the SPC file as part of the QA data MAESTRO GammaVision and other ORTEC programs can monitor the status of the SOH bit for the current spectrum on the Status tab under Acquire MCB Properties In addition user
7. Turns the DSPEC LF off OPEN_FILE filename ext OPEN_FILE_FLASH RESET RESET_REMOTE No function in the DSPEC LF included for backward compatibility SAMPLE Sending this command causes another waveform to be captured in InSight mode This command is invalid when not in InSight mode SET_BLRE baseline This sets the baseline restorer time constant to the value baseline Baseline is in microseconds with a range from 10 to 100 The specified value is only used if automatic baseline restorer mode is disabled See also ENABLE_BLRE DISABLE_BLRE and SHOW_BLRE SET_CORRECTION_FLAT value This sets the flattop correction to value The flattop correction is normally determined with the OPTIMIZE command See also SHOW_CORRECTION_FLAT SET_DATA start chans value If the optional start and chans parameters are included in this command the range of channels specified by start and chans is loaded with value If start and chans are not specified sets all channels of spectral data in the window of interest see SET_WINDOW command to the specified value ROI flags are not affected 47 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 SET_DATA_APPLICATION string1 string2 This is used to store information in the DSPEC LF internal memory that can be used by other programs such as sample descriptions and energy calibrations CONNECTIONS 32 makes use of this feature String the data identifier 32 bytes maximum
8. eee eee ooo 3 122 Using Older Detectors dal ERAN 3 1 2 3 How State of Health SOH is Monitored 0 0 0 0 0 000 00000005 3 1 3 Ballistic Deficit and Adjusting the Flattop Duration o oo oooooomoooo oo o 4 1 4 Host PC and Software Requirements 0 0 c cece eee ences 5 Lede ABOUT AA Fs og pie e aaa e ake E aa a Ae a T E aes E 5 2 GETTING STARTED voro rai RAR G a EE pene Men E Y 7 Dale The IWS PEC EF lt a a EAS 7 ZU Ao Front A teers eh ee taken a a a ag tek eee ai 7 ZA bl The Display sorene Goad A a 7 2l l2 ACOMODAN 8 Dil Rear A A AS A ES AOS tas 8 2 2 Software and Hardware Installation 0 2 eee eee eee ee ene 9 2 2 1 Step 1 Install the CONNECTIONS Driver Update o oo oooomooo 10 222 Step 2 Install MAESTRO ata dd 10 2 2 3 Step 3 Connect the DSPEC LF to the Computer 2 11 2 2 4 Step 4 Run MCB Configuration to Communicate With Your MCBs 11 2 2 4 1 Configuring a New Instrument 20 0 0 cee eee eee eee 12 2 2 4 2 Customizing ID Numbers and Descriptions 12 2 2 5 Attaching More Than One DSPEC LF to the Computer 13 2 2 6 Connecting to and Disconnecting from the Computer 14 2 3 DSPEC LF MCB Properties in MAESTRO 20 0 0 eee eee eee eee 14 De A A otro II O 14 De IMIS a rs HS wien ats 16 2 MS Ol Mode uns da Eee CEN eM Rene ead EAS RE 17 Mark VOCS is
9. represents the ASCII carriage return character Axxxcecc lt CR gt xxx is a single 8 bit unsigned number Cxxxxxccc lt CR gt XXXXxX s a single 16 bit unsigned number Dxxxxxyyyyyccc lt CR gt XXXxXx and yyyyy are 16 bit unsigned numbers Exxxxxccc lt CR gt XXXXX is a single 16 bit alarm mask Fssss lt CR gt ssss is a variable length ASCII character sequence no checksum is sent with this record Gxxxxxxxxxxccc lt CR gt XXXXXXXXXX s a Single 32 bit unsigned number IT lt CR gt True response to a SHOW command no checksum IF lt CR gt False response to a SHOW command no checksum Jxxxxxy y y y y ccc lt CR gt Response to SHOW_CONFIGURATION command MXXXXXXXXXx ccc lt CR gt Response to SHOW_STATUS command Nxxxyyyzzzccc lt CR gt XXX yyy and zzz are 8 bit unsigned numbers 4 2 2 MCB Commands This section lists each command with a description of its operation The descriptions include a list of any error codes that may result As described in the two preceding sections the usual response is a macro error code of 0 and a micro error code of 0 no errors Though syntax and communication error responses may result from any command in practice these error responses rarely occur on systems with reliable communication hardware running debugged software The commands are listed in alphabetical order each starting with a command prototype line Uppercase letters numeric digits blank space and special symbols
10. s Start button to adjust the shaping parameters interactively with a live waveform showing the actual pulse shape or just to verify that all is well 2 3 2 1 InSight Mode The InSight display Fig 11 shows the actual sampled waveform in the digital processing units on a reference graticule The Properties dialog remains active and can be used to change settings while viewing the pulses As none of the traditional analog signals are available in the DSPEC LF this mode is the only way to display the equivalent amplifier output pulse Note that at the bottom of the window the marker channel is displayed in units of time To exit the InSight mode and return to the PHA display press lt Esc gt or go to the Insight section on the Amplifier 2 tab and click on Stop The PHA mode is set to STOP when you enter the InSight mode 17 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 InSight DSPEC LF 005 File Acquire Calculate Services ROI Display Window Sa SDa xl tos a 2 9 12 o secr y Mark Mcb InSight 2 DSPEC LF 005 TE Trigger I Single Reset Delay 760 m Baseline Restorer Auto C fo pS Fast Slow up jo lt Pole Zero Auto 2100 4 Other Controls ORTEC 8 05 27 PM Mon 6 9 2008 Mcb Model No DSLF 028 Figure 11 DSPEC LF InSight Mode The Status Sidebar changes from the PHA mode controls to the In
11. 19 MDA presets to change If PeakNumber is omitted in the set command all MDA preset values will be set to 0 disabled and the supplied value will be applied to MDA Preset 0 This provides com patibility software that only supports the one nuclide MDA method implemented in some MCBs SET MODE PHA Sets the mode to PHA 51 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 SET_MODE_SAMPLE Starts the InSight Virtual Oscilloscope mode SET_PEAK_PRESET count Sets the ROI peak preset to the specified count During data acquisition when the contents of any channel of a device that has the ROI flag set reaches the peak preset count the preset is complete and the acquisition is stopped The actual number of counts in the ROI peak can exceed the preset value by a small number of counts due to the pipelined architecture of the DSPEC LF Setting a peak preset to O counts disables the preset The peak preset can be set to from 0 disabled to 2147483647 counts See also CLEAR _PRESETS and SHOW_PEAK_PRESET SET_PZ num This sets the pole zero to num which must be between 0 and 4095 See also ENABLE PZ AUTO SHOW_PZ and DISABLE _PZ AUTO SET_RADIX_BINARY No function in the DSPEC LF included for backward compatibility SET_ROI start_chan number_of_chans Sets the ROI flags for the specified channels This command can be used multiple times to set ROI flags without affecting previously set flags ROI flags specify channels w
12. Fast and Slow The fast setting is used for high count rates the slow for low count rates Auto adjusts the time constant as appropriate for the input count rate The settings Auto Fast or Slow are saved in the DSPEC LF even when the power is off The time constant can be manually set on the InSight display see the discussion beginning on page 17 You can view the time when the baseline restorer is active on the InSight display as a Mark region see the discussion on Marks p 19 In the automatic mode the current value is shown on the InSight sidebar Fig 11 For a low count rate system the value will remain at about 90 Preamplifier Type Choose Transistor Reset or Resistive Feedback preamplifier operation Your choice will depend on the preamplifier supplied with the germanium detector being used Optimize The DSPEC LF is equipped with both automatic pole zero logic and automatic flattop logic The Start Auto optimize button uses these features to automatically choose the best pole zero and flattop tilt settings Note that if you select Transistor Reset as the preamp lifier type the optimization routine does not perform the pole zero During optimization pole zeroes are performed for several rise time values and the DSPEC LF cycles through all the rise time values for the determination of the optimum tilt values As all of the values for all the combinations are maintained in the DSPEC LF you do not have to repeat o
13. Instrument Families Please check all items in this USB based instruments list that are connected to or O DPM USB installed in this computer O Dual Port Memory plug in cards ISA slot Click Done when you are O TRUMP PCI cards finished O DART or any other printer port based device O microBASE Item Description e O Miniature MCA miniMCA 166 Check this entry if you a O Maca have any ORTEC USB 2 O digiDART AS232 based instrument except a DSPEC jr R5232 e O mcs Pci O DigiBASE E Local Instrument list lt No instruments found gt MV Allow other computers to use this computer s instruments Y Figure 5 Choose USB based instruments If you also have other types of MCBs attached to this computer refer to the installation instruc tions in the corresponding hardware manuals Note that you can install device drivers for other types of instruments later as described in the CONNECTIONS Driver Update Kit instructions 2 2 2 Step 2 Install MAESTRO Install MAESTRO according to the instructions in its User Manual 10 931049D 0914 2 GETTING STARTED 2 2 3 Step 3 Connect the DSPEC LF to the Computer 1 With the computer powered on connect the DSPEC LF to the computer s USB port 2 Windows will indicate that the DSPEC LF has been detected In Windows 8 and 7 the driver will install without a wizard In XP the new hardware installation wizard will open Click Next indicate you do not wish to connect
14. RESPONSES SHOW_MDA PeakNumber Reports current MDA for the MDA Preset selected by PeakNumber PeakNumber is assumed to be 0 if not supplied Example response MDA 0000000000010 7 SHOW_MDA_COEF Reports the current settings for coeffficients a b and c used for the MDA calculation See SET_MDA_COEF Example Responses MDA_COEF 000000000002 71 000000000000000 00000021 700001 Coefficient a 2 71 b 0 and c 21 7 SHOW_MDA_PRESET PeakNumber Reports MDA preset PeakNumber If PeakNumber is omitted 0 is assumed Example Response MDA_PRES 0000000000025 7 SHOW_MODE Reports the current mode of operation PHA or Sample InSight Virtual Oscilloscope See also SET_MODE_PHA and SET_MODE_SAMPLE Responses FPHA lt CR gt PHA mode FSAM lt CR gt Sample mode InSight SHOW_MONI_LABEL num Returns with an ASCII string label designation for the state of health parameter for num SHOW_MONI_MAX Returns with the number of state of health values available for viewing SHOW_MONI VALUE num Returns with an ASCII representation of the value for the state of health parameter SHOW_NAI Indicates whether ENABLE_NAT has been sent Responses are true and false Responses IT lt CR gt Nal mode enabled IF lt CR gt Nal mode disabled 63 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 SHOW_NEXT Used in conjunction with the SHOW_ROI command SHOW_NEXT reports the next continuous group of channels that have
15. Software enabled pileup rejector ENA DIS SHO_PUR SET VERI_WIDT_REJ Alpha style HV power SHOW_HV_CURRENT Software readable vacuum SHOW_VACUUM Acquisition alarms ENA DIS SHO_ALARM Hardware acquisition trigger ENA DIS SHO_TRIG Ordinal numbers for shaping times SET_SHAP 0 SET_SHAP 1 Query gain ranges LIST VERI_GAIN_FINE _COAR CONV Routable inputs SET SHOW_INPUT_ROUTE External dwell support ENA DIS_DWELL_EXT Selectable SUM or REPLACE MCS modes ENA DIS_SUM External start of pass support ENA DIS SHO_START_EXT Explorable with MCS list commands LIST_SOURCE LIST_LLSCA LIST_ULSCA Device supports the MDA preset Software selectable ADC type Matchmaker Has ability to daisy chain MCBs DART ZDT functions available DSPEC Pro DSPEC Plus DSPEC Plus style Insight triggering LIST SET_TRIG_SAMP Multiple inputs per connection for example OCTETE Plus Hardware count rate meter SH_CRM Has multiple ZDT modes SET SHOW LIST_MODE_ZDT Has multi nuclide MDA preset Has MCS Replace then Sum Mode SET_RPLSUM Has programmable external dwell voltage capability No Peak Preset feature M CA and OASIS Programmable pulser OASIS Programmable Vacuum HV interlock OASIS Programmable Current HV interlock OASIS 0 Explorable Stabilizer LIST_GAIN_ADJU LIST_ZERO_ADJU Has programmable input impedance MCS Advanced shaping time feature has no CUSP digiDART DSPEC jr 2 0 DSPEC Pro Selectable HV
16. a T gt as lifier Type Input Polarity and Op timize Gain 1 00 Baseline Restore Optimize 0 25 1 00 Auto vw Start Auto NOTE Be sure that all of the Preamplifier Type Sepsis controls on the tabs have ie Resistor Feedbact y j Input Polarity been set before clicking Coarse MANN P SH the Start Auto optimize button The changes you Count Rate too low for for OPTI make on most property tabs take place immediately Jose There is no cancel or undo for these dialogs Figure 9 DSPEC LF Amplifier Tab 14 931049D 0914 2 GETTING STARTED Gain Set the amplifier coarse gain by selecting from the Coarse droplist then adjust the Fine gain with the horizontal slider bar or the edit box in the range of 0 45 to 1 00 The resulting effective gain is shown at the top of the Gain section The two controls used together cover the entire range of amplification from 0 45 to 32 Input Polarity Select the preamplifier input signal polarity for the signal from the detector Normally GEM p type detectors have a positive signal and GMX n type have a negative signal Baseline Restore Used to return the baseline of the pulses to the true zero between incoming pulses This improves the resolution by removing low frequency noise from dc shifts or mains power ac pickup The baseline settings control the time constant of the circuit that returns the baseline to zero There are three fixed choices Auto
17. click to highlight it in the table This will load its Nuclide Energy and coefficients in the lower sections of the dialog Change as needed then click Update To remove a preset click to highlight it in the table then click Delete IMPORTANT These MDA presets are not dynamically calculated Each time you add an MDA preset to this table its CorrectionFactor value is calculated and stored in the MCB s memory If you then load a different library change the efficiency calibration or change the system geometry the spectroscopy application will not update the existing CorrectionFactors and your MDA presets may no longer be applicable When using spectrum analysis applications such as GammaVision and Scinti Vision you can create an analysis options file SDF or SVD file for each system geometry that you use and include in it a set of MDA presets specific to 28 931049D 0914 2 GETTING STARTED that geometry efficiency calibration and nuclide library You can then recall this tailored analysis options file as needed 2 4 Setting the Rise Time in Digital MCBs To achieve the best results when using a digital spectrometer such as the DSPEC LF we recom mend that you set the rise time of the pulses being processed by the digital filter to the minimum value for the resolution needed 12 The pulse rise time and also fall time is based on the time required for each pulse to reach its peak value This peaking time
18. filter that can eliminate the resolution broadening caused by ballistic deficit Instead of a symmetrical triangle with a sharp point at the peak amplitude the rising and falling edges are separated by a flattop to form a trapezoid The width of the flattop is adjusted to be long enough to match the longest charge collection time for the detector employed This allows time for the longer charge collection pulses to reach the same maximum pulse amplitude as the faster charge collection pulses from gamma rays of the same energy Consequently the ballistic deficit is eliminated and the energy resolution is dramatically improved at these short pulse widths Note that the selection of shorter pulse widths inevitably degrades the signal to noise ratio com pared to the optimum achieved at longer pulse widths Thus operating at shorter pulse widths will compromise the energy resolution of low energy gamma rays for which the preamplifier noise makes a significant contribution to the energy resolution The signal to noise degradation is independent of the ballistic deficit effect The flattop and other shaping controls are on the Amplifier 2 tab under Acquire MCB Proper ties see Section 2 3 2 for a more detailed discussion 1 4 Host PC and Software Requirements The DSPEC LF is completely computer controlled and can be operated with any suitable ORTEC CONNECTIONS software including the supplied MAESTRO MCA Emulator Software A65 B3W communicat
19. for the DSPEC LF internal amplifier In operation the resulting signal gain is the product of the coarse gain the fine gain and the super fine gain used by stabilizer The coarse gain is returned in terms of an integer gain multiplier Responses C00001088 lt CR gt Coarse gain reported as 1 C00002089 lt CR gt Coarse gain reported as 2 C00004091 lt CR gt Coarse gain reported as 4 C00008095 lt CR gt Coarse gain reported as 8 C00016094 lt CR gt Coarse gain reported as 16 C00032092 lt CR gt Coarse gain reported as 32 SHOW_GAIN_CONVERSION 58 This command returns the conversion gain Responses C00512095 lt CR gt Conversion gain reported as 512 channels C01024094 lt CR gt Conversion gain reported as 1024 channels C02048101 lt CR gt Conversion gain reported as 2048 channels C04096106 lt CR gt Conversion gain reported as 4096 channels C08192107 lt CR gt Conversion gain reported as 8192 channels C16384109 lt CR gt Conversion gain reported as 16384 channels 931049D 0914 4 FIRMWARE COMMANDS AND RESPONSES SHOW_GAIN_FINE Returns the current fine gain setting See SET_GAIN_FINE Sample Response GAIN_FINE 000000 70000203 Fine gain is set to 0 7 SHOW_GAIN_POLARITY Returns the polarity of the amplifier input as F records Responses FNEG lt CR gt The amplifier input is set to negative FPOS lt CR gt The amplifier input is set to positive SHOW_GAIN_STABILIZATION Reports the state of gain
20. gt 2000 V negative not overloaded disabled D0200000002076 lt CR gt 2000 V positive not overloaded disabled D0200000007082 lt CR gt 2000 V negative not overloaded enabled SHOW_ID Reports the sample ID string as was previously set by the SET_ID command Example Responses FSite 123 lt CR gt ID set to Site 123 FSample 123456789 lt CR gt ID set to Sample 123456789 SHOW_INTEGRAL start_chan number_of_chans Reports the sum of the specified group of spectral data channels If start_chan and number_of_chans is not provided SHOW_INTEGRAL reports the sum of all channels in the currently selected window that have their ROI flag set Responses G0000000000075 lt CR gt Integral reported as 0 G4294967294131 lt CR gt Integral reported as 4294967294 G4294967295132 lt CR gt Integral reported as greater than or equal to 4294967295 maximum reportable value SHOW_INTEGRAL_PRESET Reports the current ROI integral preset value For more information about the ROI integral preset see SET_INTEGRAL_PRESET See also SHOW_INTEGRAL Responses G0000000000075 lt CR gt Integral preset reported as 0 G4294967295132 lt CR gt Integral reported as 4294967295 SHOW_INTEGRAL_REMAINING Reports the current ROI integral remaining value For more information about the ROI integral remaining see SET_INTEGRAL_REMAINING See also SHOW_INTEGRAL Responses G0000000000075 lt CR gt Integral remaining reported as 0 G42
21. legal shutdown settings which were displayed with the LIST_SHUTDOWN command Example SET_SHUT 0 Sets the SHUTDOWN to TTL SET_SHUT 1 Sets the SHUTDOWN to ORTEC SET_SHUT 2 Sets the SHUTDOWN to SMARTI SET_SHUTDOWN_ORTEC This sets the bias shutdown mode to ORTEC SET_SHUTDOWN_SMART Sets the bias shutdown mode to SMART 1 SET _SHUTDOWN_TTL This sets the bias shutdown mode to TTL SET_THRESHOLD_NEGATIVE value Sets the negative threshold to value The negative threshold is normally set automatically by the DSPEC LF See also ENABLE_ THRESHOLD_AUTOMATIC and SHOW_ THRESHOLD_NEGATIVE 53 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 SET_THRESHOLD_POSITIVE value Sets the positive threshold to value The positive threshold is normally set automatically by the DSPEC LF See also ENABLE_THRESHOLD_AUTOMATIC and SHOW_ THRESHOLD_ POSITIVE SET_TIME hour min sec Sets the time stored in the battery backed up system clock to the specified values hour can be any value from 0 23 min and sec can be any value from 0 59 The current date and time are stored for a device when an acquisition is started See also SHOW_TIME SET_DATE SHOW_DATE SET_TIME_START and SHOW_TIME_START SET_TIME_START hour min sec Sets the start time to the specified values Normally the start date and time are set automatically whenever a device is started with the START command See also SHOW_TIME_START SET_DATE_START SHOW_DATE_START SET_DA
22. of 12 volts since the last time the SOH was cleared DIM 12V State of Health OK if the 12 volt supply in the DIM has stayed within 200 mV of 12 volts since the last time the SOH was cleared DIM 24V State of Health OK if the 24 volt supply in the DIM has stayed within 200 mV of 24 volts since the last time the SOH was cleared Temperature State of Health OK if the detector temperature has stayed below the high temperature limit set in the detector since the last time the SOH was cleared High Voltage State of Health OK if the HV supply in the DIM has stayed within 200 V of specified bias voltage since the last time the SOH was cleared Shutdown State of Health OK if the detector shutdown has not activated since the last time the SOH was cleared Preamplifier overload State of Health OK if the preamplifier overload has not activated since the last time the SOH was cleared Security State of Health OK if the security test was passed at the end of the last spectrum acquisition 24 931049D 0914 2 GETTING STARTED Power State of Health OK if the power to the DIM was constant during the last spectrum acquisition 24 volts The current value of the 24 volt supply in the DIM as delivered to the detector 12 volts The current value of the 12 volt supply in the DIM as delivered to the detector 12 volts The current value of the 12 volt supply in the DIM as delivered to the detector 24 volts The curr
23. of 16384 total channels Gain Correction Resolution 0 00025 from 99 5 to 100 5 in 4096 steps 3 1 1 Electrical and Mechanical Dimensions DSPEC LF 8 1 cmH x 20 3 cm W x 24 9 cm D 3 2 in x 8 in x 9 8 in DIM 11 2 cmH x 3 13 cm W x 6 5 cm D 4 4 in x 1 25 in x 2 6 in Weight DSPEC LF 1 0 kg 2 2 Ib DIM lt 240 gm 0 5 Ib Operating Temperature Range 0 to 50 C including LCD display 33 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 CE Conforms to CE standards for radiated and conducted emissions susceptibility and low voltage power directives 3 1 2 Connectors DETECTOR Multipin connector 13W3 carries the following e Preamp Power 1 W only 12V 12V 24V 24V 2 GND Amp In Normal amplifier input Inhibit For TRP or gate Battery Power 5 12 V for DIM Control for HV SMART 1 HPGe detector control USB High speed USB for communication with computer 12 15V DC External power input from wall mounted de power supply 12 V dc lt 1 25 A center contact positive The connector is RAPC712 Switchcraft 5 5 mm x 2 5 mm 3 2 HPGe High Voltage Detector Interface Modules The DSPEC LF offers high voltage supply flexibility in the form of modules that connect the detector to the MCA and provide bias and SMART 1 support if appropriate These modules have an input connector that connects to the DETECTOR connector discussed in Section 3 1 2 On a SMART 1 detector
24. peak stabilization See also ENABLE_GAIN_STABILIZATION and DISABLE_GAIN_STABILIZATION Responses IT lt CR gt Gain stabilization is currently enabled IF lt CR gt Gain stabilization is currently disabled SHOW_GAIN_WIDTH Reports the current width for the stabilizer gain peak See also SET_GAIN_WIDTH SET_GAIN_CHANNEL and SHOW_GAIN_CHANNEL Responses C00001088 lt CR gt Gain width has not been set C00003089 lt CR gt Gain width is 3 channels lowest possible width C00256100 lt CR gt Gain width is 256 channels highest possible width in Gauss mode SHOW_GATE Reports the current mode of operation of the ADC gate input See also SET_GATE_OFF SET_GATE_COINCIDENT and SET_GATE_ANTICOINCIDENT Responses FOFF lt CR gt Reports the ADC gate is off or ignored FCOI lt CR gt Reports the ADC gate is in coincident mode FANT lt CR gt Reports the ADC gate is in anticoincident mode SHOW_HV Reports the current high voltage and the status of the high voltage power supply in the form Dvvvvvsssssccc 59 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 Where vvvvv represents the current output voltage if the high voltage is enabled or the rear panel high voltage setting if the high voltage is disabled sssss represents the status of the high voltage bias supply as a 16 bit decimal number with the following bit definitions Bit 0 LSB Bias supply polarity 0 positive 1 negative Bit 1 Bias
25. rise time SET SHOW LIST_HV_RISE SBS 60 37 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 Bit 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 38 Meaning Monitor command support SHOW_MONI_MAX LABEL V ALUE SMART 1 Detector support SHOW_SMART_DET SHOW_SNUM_DET SHOW_HV_RECO Nuclide report SET SHOW_NUCL_COEF SET SHOW_ROL NUCL Interactive Display Features Such as Nuclide Report Advanced Stored Spectra SH_SPEC_COUNT SET SHOW_SPEC_ID MOVE SET SHOW_VIEW in MCBs with Dual Port Memory or printer port interfaces LIST_VIEW in all MCBs Connected to MCB via RS 232 slow port No SET_HV_POSI SET_HV_NEGA ENA_NATand DIS_NAI Low Frequency Rejecter ENA DIS SHOW_LFR Resolution Enhancer ENA DIS SH_RENHANCER SET SHOW_RETABLE idx val SET_MODE_RELIST for Resolution Enhancer List Mode Readable Sample mode time per channel SH_TIME_SAMPLE Adjustable Sample mode time per channel SET LIST_TIME_SAMPLE List Mode data streamed and formatted as in digiBASE Supports ETP mode ENA DIS SHOW_ETP List Mode data streamed and formatted as in DSPEC Pro SET SHOW LIST_PZ using floating point microseconds 4 FIRMWARE COMMANDS AND RESPONSES Software communication with the DSPEC LF will take place through the CONNECTIONS soft ware layer CONNECTIONS is used by all ORTEC software and can be accessed for other software development with our CONNECTIONS Programmer
26. s N020013037050 lt CR gt Time returned 20 13 37 20 h 13 min 37 s SHOW_TIME_START Reports the time of the last START command in the form Nhhhmmmsssccc lt CR gt where hhh represents a 3 digit integer hour 0 through 23 mmm represents a 3 digit integer minute 0 through 59 and sss represents a 3 digit integer second 0 through 59 See also SET_TIME_START SET_DATE_START and SHOW_DATE_START Example Responses N010054017052 lt CR gt Time returned 10 54 17 10 h 54 min 17 s N020013037050 lt CR gt Time returned 20 13 37 20 h 13 min 37 s SHOW_TRIGGER_SAMPLE Reports the trigger source in Insight Mode Responses FOLLD LLD is source F1PKD Peak detect is source 68 931049D 0914 4 FIRMWARE COMMANDS AND RESPONSES F2RANDOM Trigger happens randomly F3Gate Gate Input triggers the waveform SHOW_TRIGGER_SPECIAL No function in the DSPEC LF included for backward compatibility SHOW_TRUE Reports the contents of the true time counter in units of 20 ms 50 ticks s See also CLEAR_COUNTERS and SET_TRUE Responses G0000000000075 lt CR gt True time reported as O ticks G0000000001076 lt CR gt True time reported as 1 tick 20 ms G4294967295132 lt CR gt True time reported as 4294967295 ticks over 23000 days SHOW_TRUE_PRESET Reports the current true time preset in units of 20 ms 50 ticks s See also CLEAR_PRESETS and SET_TRUE_PRESET Responses G0000000000075 lt CR gt True time preset rep
27. s Toolkit with Microsoft ActiveX Controls A11 Use the DLL interface call MIOComm or the ActiveX control UCONN s Comm method to send commands to instruments and receive responses 4 1 Command Format The commands consist of a command header that may be followed by numeric parameter values The header consists of a verb a verb and noun or a verb noun and modifier each separated by underscores The first four letters of a word in a command will always be enough to uniquely identify that word when composing commands for the instrument For example the command ENABLE_GAIN_STABILIZATION can be abbreviated to ENAB_GAIN_STAB Numeric parameters are unsigned integer numbers that follow the command header separated by one or more spaces Specific commands require multiple parameters separated by commas that specify numeric quantities related to the operation of the MCB such as live time or conversion gain The command SET_WINDOW 0 8192 has two parameters O and 8192 which set the window of interest to start at channel O and continue for 8192 channels Some parameters are optional and are delimited by square brackets in the command prototype line to distinguish them from mandatory parameters e g SET_WINDOW start length Com mands with optional parameters can be sent to the MCB without the optional parameters in which case the instrument behavior will be explained in the command description 4 2 Error Codes On each completion of
28. supply overload 0 overload 1 normal Bit 2 High voltage enabled 0 disabled 1 enabled Example Responses D0200000003077 lt CR gt 2000 V negative not overloaded disabled D0200000002076 lt CR gt 2000 V positive not overloaded disabled D0200000007082 lt CR gt 2000 V negative not overloaded enabled SHOW_HV_ACTUAL Returns the value of HV actually on the detector SHOW_HV_DIM Indicates whether HV_DIM is enabled or disabled SHOW_HV_HEALTH Returns the status of the state of health for the detector as reported by the DIM or SMART 1 SHOW_HV_POLARITY This returns the HV polarity defined in the DIM as a F record Responses FNEG lt CR gt The HV is set to negative FPOS lt CR gt The HV is set to positive SHOW_HV_RECOMMEND Returns HV in volts in ASCII from SMART 1 detectors SHOW_HV_TARGET Under normal operation the HV will go to this value when the HV is enabled Reports the current HV setting see SET_HV and the status of the HV power supply in the form Dvvvvvsssssccc lt CR gt where vvvwv represents the HV setting and sssss represents the status of the HV bias supply as a 16 bit decimal number with the following bit definitions Bit 0 LSB Bias supply polarity 0 positive 1 negative Bit 1 Bias supply overload 0 overload 1 normal Bit 2 HV enabled 0 disabled 1 enabled 60 931049D 0914 4 FIRMWARE COMMANDS AND RESPONSES Example Responses D0200000003077 lt CR
29. the ROI flag set The response is of the form Dsssssnnnnnccc lt CR gt where sssss represents an integer number that is the number of the first channel of the next group of channels that all have their ROI bit set and nnnnn represents an integer number that is the number of channels in the group If no more channels have their ROI bit set SHOW_NEXT returns a first channel of 0 and a number of channels of 0 The SHOW_ROI command is used to report the first group of channels that all have their ROI bit set Example Responses D0100000050078 lt CR gt Next ROI group starts at channel 1000 and is 50 channels long D0215000150086 lt CR gt Next ROI group starts at channel 2150 and is 150 channels long D0000000000072 lt CR gt No other ROI groups to report SHOW_OVERFLOW_PRESET Reports the state of the overflow preset Responses IT lt CR gt Overflow preset enabled IF lt CR gt Overflow preset disabled SHOW_PEAK This command returns the contents of the ROI channel with the largest number of counts An ROI channel is a channel that has the ROI flag set The maximum possible value is 2147483647 which is the maximum number of counts that can be stored in a 31 bit channel Responses G0000000000075 lt CR gt Maximum count in an ROI channel is zero or no ROI channels were found G0000000001076 lt CR gt Maximum count in an ROI channel is 1 G2147483646120 lt CR gt Maximum count in an ROI channel is 2147483646
30. this preset condition the MCB stops counting when any ROI channel reaches this value unless there are no ROIs marked in the MCB in which case that MCB continues counting until the count is manually stopped Enter the ROI Integral preset value in counts With this preset condition the MCB stops count ing when the sum of all counts in all channels for this MCB marked with an ROI reaches this value This has no function if no ROIs are marked in the MCB The Uncertainty preset stops acquisition when the statistical or counting uncertainty of a user selected net peak reaches the value you have entered Enter the Preset in value as percent uncertainty at 1 sigma of the net peak area The range is from 99 to 0 1 in 0 1 steps You have complete control over the selected peak region The region must be at least 7 channels wide with 3 channels of background on each side of the peak Note that MAESTRO calculates this preset once per 40 seconds Therefore the software will continue data acquisition up to 40 seconds after the preset has been reached and the uncertainty achieved for a high count rate sample may be lower than the preset value Use the Start Channel and Width fields to enter the channel limits directly or click Suggest Region If the marker is positioned in an ROI around the peak of interest Suggest Region reads the limits of the ROI with the marker and display those limits in the Start Chan and Width fields The ROI can be cleared afte
31. times the FWHM at L this energy Now click on the appropriate Enabled checkbox to turn the stabilizer on Until changed in this dialog the stabilizer will stay enabled even if the power is turned off When the stabilizer is enabled the Center Channel and Width cannot be changed Figure 14 DSPEC LF Stabilizer Tab 2 3 5 High Voltage Figure 15 shows the High Voltage orasan for DSLF 3472 tab which allows you to turn the high voltage on or off set and monitor the voltage and choose the Shutdown Amplifier Ampifier2 AmplifierPRO ADC Stabilizer High Voltage About Status Presets MDAPreset i Target O Volts Shutdown The shutdown can be TTL ORTEC Off Actual 0 Volts UL 7 or SMART The ORTEC mode is used for all ORTEC detectors except SMART 1 detectors Use the SMART A rere Cnet option for those detectors Check with the detector manufacturer for other Off Overload detectors The TTL mode is used for most non ORTEC detectors Figure 15 DSPEC LF High Voltage Tab The polarity is determined by the DIM or SMART 1 module which also supplies the bias voltage The recommended HV for SMART 1 is displayed on the dialog For other detectors see the detector manual or data sheet for the recommended voltage Enter the detector high voltage in the Target field click On and monitor the voltage in the Actual field Click the Off button to turn off the high voltage The HV
32. under Acquire MCB Properties see Section 2 3 2 Beyond this peak amplitude time the pulse falls back to the baseline to allow a subsequent gamma ray to be processed If all the charge has not been collected by the detector by the desig nated time for peak amplitude there will be a deficit in the measured peak amplitude and a broadening of the pulse width all caused by the slow charge collection The deficit in amplitude is called the ballistic deficit Obviously events that result in a faster charge collection time will suffer less deficit and less increase in pulse width than those yielding a slower charge collection time even though the deposited energy was identical Thus the ballistic deficit resulting from variable charge collection times broadens the energy resolution for that gamma ray If the longest charge collection time is negligible compared to the rise time of the filter pulse the ballistic deficit will be imperceptible and the energy resolution will not be degraded Thus at the 10 us to 20 us rise times typically selected for optimum signal to noise ratio 1 e minimum peak FWHM at low energies the ballistic deficit problem can be ignored Long rise times create higher dead times and depress the maximum counting rate limit If it is necessary to accept higher counting rates the rise fall times must be shortened accordingly For 4 931049D 0914 1 INTRODUCTION this case the DSPEC LF includes a flattop feature for the
33. value from 65535 to 65535 The total range of the adjustment value represents 256 channels This adjustment is usually only made by the gain stabilizer and reset to 0 with the INITIALIZE_ZERO_ STABILIZATION command See also SHOW_ZERO_ADJUSTMENT SET_ZERO_CHANNEL chan Sets the center channel for the stabilizer zero peak If a zero channel is chosen such that the beginning channel or ending channel would be below channel 0 or above the maximum channel as determined by the conversion gain the zero peak width is reduced until the peak fits the device boundaries A zero channel and width must be set before zero stabilization can be enabled See also ENABLE_ZERO_ STABILIZATION SET_ZERO_WIDTH chans Sets the width in channels for the stabilizer zero peak The zero width must be chosen such that the beginning channel is no lower than channel 0 and the ending channel is no higher than the maximum channel as determined by the conversion gain The zero channel and width must be set before zero stabilization can be enabled The absolute minimum width for the zero peak is 3 channels and the absolute maximum width for the zero peak is 256 channels in Gauss mode In point mode there is no maximum peak width though the chosen width must allow the peak to fit within the device s channel limits as stated above SHOW_ACTIVE Returns a 1 if the DSPEC LF is active 1 e acquiring spectral data or 0 if it is not active Responses C00000087 lt CR gt Not act
34. will provide a quotation Damage in Transit Shipments should be examined immediately upon receipt for evidence of external or concealed damage The carrier making delivery should be notified immediately of any such damage since the carrier is normally liable for damage in shipment Packing materials waybills and other such documentation should be preserved in order to establish claims After such notification to the carrier please notify AMT of the circumstances so that assistance can be provided in making damage claims and in providing replacement equipment if necessary Copyright 2014 Advanced Measurement Technology Inc All rights reserved ORTEC is a registered trademark of Advanced Measurement Technology Inc All other trademarks used herein are the property of their respective owners NOTICE OF PROPRIETARY PROPERTY This document and the information contained in it are the proprietary property of AMETEK Inc It may not be copied or used in any manner nor may any of the information in or upon it be used for any purpose without the express written consent of an authorized agent of AMETEK Inc TABLE OF CONTENTS WARRANTS EE or a ERAN ames PAE 11 Safety Instructions and Symbols 2 A Aa v Cleans Instructions derer A E ASA ESA AS ALEA v t INTRODUCTION A rt 1 1 1 Why th DSPEC LE At lA AE EE 1 1 2 DSPEC LF SMART 1 HPGe Detector Support ooocoocccccococconccnoo 2 1 2 1 SMART 1 HPGe Detector Construction 0 0 0
35. you to connect DSPEC LFs to and disconnect them from a USB port without shutting down the computer or USB hub Note that if MAESTRO is running when you disconnect the DSPEC LF you will see a detector not responding message on the status line at the bottom of the MAESTRO window When you reconnect the DSPEC LF to the com puter you will have to reselect it from the detector droplist on the Toolbar 2 3 DSPEC LF MCB Properties in MAESTRO This section discusses the hardware setup dialog you will see within MAESTRO and all other ORTEC CONNECTIONS software e g GammaVision ISOTOPIC when you click Acquire MCB Properties The DSPEC LF is completely software controlled the MCB Properties dialog contains all of the instrument controls including ADC setup parameters acquisition presets amplifier gain adjustments pole zero controls and access to the InSight Virtual Oscilloscope Just move from tab to tab and set your hardware parameters then click on Close it s that easy Note that as you enter characters in the data entry fields the characters will be underlined until you move to another field or until 5 seconds have lapsed since a character was last entered During the time the entry is underlined no other program or PC on the network can modify this value 2 3 1 Amplifier Figure 9 shows the Amplifier tab pam for DSLF 3472 This tab contains the controls for Gain Baseline Restore Preamp eer al al Pass
36. 000 7049 SHOW_SEGMENT Returns the current segment number Always 1 for the DSPEC LF SHOW_SHAPE_CUSP No function in the DSPEC LF included for backward compatibility SHOW_SHAP_FLAT Reports the width of the flattop in us See also SET_SHAP_FLAT Responses SHAP_ FLAT 0000000000001 2 SHOW_SHAP_RISE Displays the rise time setting in us See also SET_SHAP_RISE Responses SHAP_RISE 0000000000003 2 66 931049D 0914 4 FIRMWARE COMMANDS AND RESPONSES SHOW_SHUTDOWN Shows the type of HV shutdown selected Responses FORT ORTEC mode selected FTTL TTL mode selected FSM1 SMART 1 mode selected SHOW_SHUT_ACTUAL Returns the current status of the bias remote shutdown input signal This command is valid whether the bias supply is turned on or off Responses IT Shutdown is active supply is shut down or can t be turned on IF Shutdown is inactive supply is on or can be turned on SHOW_SNUM Responds with a F record indicating the serial number of the DSPEC LF Response F100 Serial number 100 SHOW_STATUS Returns system status information in the following format SMI ttttttttttaaaaahhhhhccc lt CR gt where 1111111111 represents the live time as returned by the SHOW_LIVE command tttttttttt represents the true time for the current device as returned by the SHOW_TRUE command aaaaa represents the active device mask as returned by the SHOW_ACTIVE_DEVICES command and hhhhh represents the hardware status whi
37. 7056 lt CR gt Date reported as Dec 31 2087 SHOW_DELAY_COLLECTION Shows the width of the PUR signal setting See also SET_DELAY_ COLLECTION Responses DEL_COLL 0000000000001 6 SHOW_DELAY_SAMPLE Shows the Delay Sample setting See also SET_DELAY_SAMPLE Responses C00003090 The sample number is 00003 and 090 is the checksum SHOW_DET_SNUM This command responds with the detector serial number stored in the SMART 1 DIM Response FP40175 Serial number P40175 SHOW_DET_VERSION Returns the DIM firmware version Examples FNAIDO00 Nal DIM firmware version FSMDT000 SMART 1 firmware version SHOW_DEVICE Shows the currently selected device Always 1 for DSPEC LF 57 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 SHOW_FEATURES Responds with four 32 bit masks indicating which features are present in the MCB See Appendix 3 3 for a complete description of each bit in the mask Example Response FEATURES 02268854591 01084117004 02736788880 00000065688 SHOW_GAIN_ADJUST Returns the gain stabilizer amplifier setting SHOW_GAIN_CHANNEL Reports the current center channel for the stabilizer gain peak See also SET_GAIN_CHANNEL Responses C00000087 lt CR gt Gain channel has not been set C00002089 lt CR gt Gain channel is channel 2 lowest possible channel C16382107 lt CR gt Gain channel is channel 16382 highest possible channel SHOW_GAIN_COARSE Returns the coarse gain
38. 94967295132 lt CR gt Integral reported as 4294967295 61 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 SHOW_LENGTH_SAMPLE Reports the number of points in the Insight mode waveform Response C01000088 1000 points in the waveform SHOW_LIVE Reports the contents of the live time counter in units of 20 ms 50 ticks s See also CLEAR_COUNTERS and SET_LIVE Responses G0000000000075 lt CR gt Live time reported as O ticks G0000000001076 lt CR gt Live time reported as 1 tick 20 ms G4294967295132 lt CR gt Live time reported as 4294967295 ticks over 23000 days SHOW_LIVE_PRESET Reports the current live time preset in units of 20 ms 50 ticks s See also CLEAR_PRESETS and SET_LIVE_PRESET Responses G0000000000075 lt CR gt Live time preset reported as disabled G0000000001076 lt CR gt Live time preset reported as 1 tick G4294967295132 lt CR gt Live time preset reported as 4294967295 ticks SHOW_LIVE_REMAINING Reports the current live time remaining in units of 20 ms 50 ticks s See also SET_LIVE_REMAINING Responses G0000000000075 lt CR gt Live time remaining reported as disabled G0000000001076 lt CR gt Live time remaining reported as 1 tick G4294967295132 lt CR gt Live time remaining reported as 4294967295 ticks SHOW_LLD Shows the lower level discriminator setting See also SET_LLD Responses C00050092 The LLD is 50 62 931049D 0914 4 FIRMWARE COMMANDS AND
39. ALIZE_ GAIN_STABILIZATION command See also SHOW_GAIN_ADJUSTMENT SET_GAIN_CHANNEL chan Sets the center channel for the stabilizer gain peak If a gain channel is chosen such that the beginning channel or ending channel would be below channel 0 or above the maximum channel as determined by the conversion gain the gain peak width is reduced until the peak 48 931049D 0914 4 FIRMWARE COMMANDS AND RESPONSES fits the device boundaries A gain channel and width must be set before gain stabilization can be enabled SET_GAIN_COARSE num This sets the coarse gain to num which must be 1 2 4 8 16 or 32 See also SHOW _ GAIN_COARSE SET_GAIN_CONVERSION chans Sets the conversion gain The conversion gain defines the number of channels within the device that will used for spectral data This has the effect of altering the resolution of the ADC from 14 bits conversion gain 16384 to 9 bits conversion gain 512 for the device See also SHOW_GAIN_CONVERSION Legal Commands SET_GAIN_CONVERSION 0 lt CR gt Conversion gain set to default 16384 SET_GAIN_CONVERSION 512 lt CR gt Conversion gain set to 512 channels SET_GAIN_CONVERSION 1024 lt CR gt Conversion gain set to 1024 channels SET_GAIN_CONVERSION 2048 lt CR gt Conversion gain set to 2048 channels SET_GAIN_CONVERSION 4096 lt CR gt Conversion gain set to 4096 channels SET_GAIN_CONVERSION 8192 lt CR gt Conversion gain set to 8192 channels SET_GAIN_CONVERSION 16384 lt
40. Amplifier 2 Figure 10 shows the Amplifier 2 for DSLF 3472 tab which accesses the advanced shaping controls including the InSight Virtual Oscilloscope mode High Voltage About Status Presets MDAPreset Amplifier Amplifier2 AmpifierPRO ADC Stabilizer Rise Time Flattop The many choices of Rise Time let 1200 H Widtn ogo you precisely control the tradeoff Tit 0 00000 between resolution and throughput Poke Zmd see Section 2 4 This setting affects both the rise and fall times so changing it spreads or narrows the quasi trapezoid symmetrically InSight Start Stop 2200 Use the up down arrows to set the Rise Time from 0 8 to 23 0 us Once the unit has been optimized see page 15 you can use any Rise Time without having to re optimize Figure 10 DSPEC LF Amplifier 2 Tab The value of the rise time parameter in the DSPEC LF is roughly equivalent to twice the integra tion time set on a conventional analog spectroscopy amplifier Thus a DSPEC LF value of 12 us corresponds to 6 us in a conventional amplifier Starting with the nominal value of 12 0 you should increase values of the rise time for better resolution for expected lower count rates or when unusually high count rates are anticipated reduce the rise time for higher throughput with somewhat worse resolution 16 931049D 0914 2 GETTING STARTED The Flattop controls adjust the top of the quasi trapezoid The Wid
41. CR gt Conversion gain set to 16384 channels SET_GAIN_FINE value Sets the fine gain to value Value is a floating point value from 0 333 to 1 0 See also SHOW_GAIN_FINE SET_GAIN_NEGATIVE Sets the amplifier input polarity to negative SET_GAIN_POSITIVE Sets the amplifier input polarity to positive SET_GAIN_PRESET count No function in the DSPEC LF included for backward compatibility SET_GAIN_WIDTH chans Sets the width in channels for the stabilizer gain peak The gain width must be chosen such that the beginning channel is no lower than channel 0 and the ending channel is no higher than the maximum channel as determined by the conversion gain The gain channel and width must be set before gain stabilization can be enabled The absolute minimum width for the gain peak is 3 channels and the absolute maximum width for the gain peak is 256 channels in Gauss mode In point mode there is no maximum peak width though the chosen 49 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 width must allow the peak to fit within the device s channel limits as stated above See also SHOW_GAIN_WIDTH SET_GAIN_CHANNEL and SHOW_GAIN_CHANNEL SET_GATE_ANTICOINCIDENT Causes the DSPEC LF to use the ADC gate input signal in anticoincident mode See also SET_GATE_OFF SET_GATE_COINCIDENT and SHOW_GATE SET_GATE_COINCIDENT Causes the DSPEC LF to use the ADC gate input signal in coincident mode See also SET_GATE_OFF SET_GATE_AN
42. ESPONSES ENABLE_PZ_NEED Enables the reporting of an error when the DSPEC LF needs pole zeroing ENABLE_REMOTE No function in the DSPEC LF included for backward compatibility ENABLE_THRESHOLD_AUTOMATIC Enables automatic determination of the positive and negative thresholds See also DISABLE_THRESHOLD_AUTO SHOW_THRESHOLD_AUTO SET_THRESHOLD_ NEGATIVE and SET_THRESHOLD_POSITIVE ENABLE_ZERO_STABILIZATION Enables the stabilization of the zero peak See also DISABLE_ZERO_ STABILIZATION SHOW_ZERO_STABILIZATION and INITIALIZE_ZERO_STABILIZATION INITIALIZE Returns the DSPEC LF including flash to the factory default settings and simulates a power down power up cycle for the MCB after a simulated loss of battery backed up memory CAUTION Before issuing this command protect the DIM by turning off the detector bias and physically disconnecting the detector cable from the DSPEC Pro rear panel INITIALIZE_GAIN_STABILIZATION Resets the gain peak stabilization adjustment to unity no adjustment This value is reported as 2048 by the SHOW_GAIN_ADJUSTMENT command See also SET_GAIN_ADJUSTMENT ENABLE_GAIN_ STABILIZATION and DISABLE_GAIN_STABILIZATION INITIALIZE_ZERO_STABILIZATION Resets the zero peak stabilization adjustment to unity no adjustment This value is reported as 2048 by the SHOW_ZERO_ADJUSTMENT command See also SET_ZERO_ADJUSTMENT ENABLE_ZERO_STABILIZATION and DISABLE_ZERO_STABILIZATION LIST_BLRE Lists the valid sett
43. E_ AUTOMATIC Enables the automatic determination of baseline restorer time constant See also DISABLE _ BLRE_AUTO SHOW_BLRE and SET_BLRE ENABLE_GAIN_STABILIZATION Enables the stabilization of the gain peak See also DISABLE_GAIN_ STABILIZATION SHOW_GAIN_STABILIZATION and INITIALIZE_GAIN_STABILIZATION ENABLE_HV Turns on the high voltage enable output of the DSPEC LF See also DISABLE_HV and SHOW_HV ENABLE_HV_DIM Enables the DSPEC LF to work with a standard DIM e g DIM POSNAI DIM POSGE or DIM NEGGE DIM 296 This command enables the DSPEC LF to poll the DIM and causes the DSPEC LF to return State of Health information to a controlling program see SHOW_HV_HEALTH command ENABLE_NAI Switches the stabilizers to Nal mode The stabilizers use the fine adjustment in Nal mode and the very fine adjustment in Ge mode See DISABLE_NAI ENABLE_OPTI_NEED Enables the reporting of an error when the DSPEC LF needs optimizing ENABLE_OVERFLOW_PRESET Enables the overflow preset Channels that receive a count when they contain 2147483647 counts the maximum number of counts will stop the acquisition 1f the overflow preset is enabled The channel that caused the preset to complete will contain 2147483647 counts See also DISABLE_OVERFLOW_PRESET and SHOW_OVERFLOW_PRESET commands ENABLE_PZ_AUTOMATIC Enables the automatic pole zero mode See also DISABLE_PZ_AUTO and SHOW_PZ_ AUTO 44 931049D 0914 4 FIRMWARE COMMANDS AND R
44. Feature mask Dlls casio ads 35 A a en ee eS 17 Ballistic deficiti acarrea 4 E E 15 17 Wah eas coy old Seed a a e eee oe 17 Gain stabiliZalions tarados 21 AA each stip oh Un ay hl ek ules 21 Hish Voltaj ts Gach ld e 22 Sieht Mode sid Bach oy oe eae le a 17 Mar taarat le Gels 19 Mark TYPOS tik bach cin oh des 19 Install An A yng a aaah led Gee 9 Integration UME serrana ears 16 A O ah ae shel Gers 26 Lower level discriminator LLD 21 MDA pr set a te tele abet 27 AA EE EE EAA bei e ow 15 OPUMIZE 2 dos n A Bact A 15 Pole Tras coast bc bes 15 17 Preamplifier type sis 15 Presets oreren l aan ca ba a 25 Realtime errentan t ar a 26 Resistive Feedback 15 Resolutioniin 0d iba 16 17 RISC TING 20 aaa ide 15 16 SMART 1 detector 1 2 7 State of health SOH 1 3 23 73 Throushpul stars 16 17 Time CONSE serere iaa das 15 Transistor Retardo aida a 15 Troubleshooting cas os bed 30 Uneertanty presets Sad 26 Upper level discriminator ULD 21 Zero stabilization 20 oY th ar ah ad oa SRY 21 tall cat ea 21 75 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 Intentionally blank 76
45. ORTEC DSPEC LF Digital Gamma Ray Spectrometer Hardware User s Manual Printed in U S A ORTEC Part No 931049 0914 Manual Revision D Advanced Measurement Technology Inc AMT WARRANTY AMT warrants that the items will be delivered free from defects in material or workmanship AMT makes no other warranties express or implied and specifically NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE AMT s exclusive liability is limited to repairing or replacing at AMT s option items found by AMT to be defective in workmanship or materials within one year from the date of delivery AMT s liability on any claim of any kind including negligence loss or damages arising out of connected with or from the performance or breach thereof or from the manufacture sale delivery resale repair or use of any item or services covered by this agreement or purchase order shall in no case exceed the price allocable to the item or service furnished or any part thereof that gives rise to the claim In the event AMT fails to manufacture or deliver items called for in this agreement or purchase order AMT s exclusive liability and buyer s exclusive remedy shall be release of the buyer from the obligation to pay the purchase price In no event shall AMT be liable for special or consequential damages Quality Control Before being approved for shipment each AMT instrument must pass a stringent set of quality control test
46. Presets tab the changes take place only when you start the next acquisition or Close the Properties dialog When more than one preset is enabled set to a non zero value the first condition met during the acquisition causes the MCB to stop This can be useful when you are analyzing samples of widely varying activity and do not know the general activity before counting For example the Live Time preset can be set so that sufficient counts can be obtained for proper calculation of the activity in the sample with the least activity But if the sample contains a large amount of this or another nuclide the dead time could be high resulting in a long counting time for the sample If you set the ROI Peak preset in addition to the Live Time preset the low level samples will be counted to the desired fixed live time while the very active samples will be counted for the ROI peak count In this circumstance the ROI Peak preset can be viewed as a safety valve Enter the Real Time and Live Time presets in units of seconds and fractions of a second These values are stored internally with a resolution of 20 milliseconds ms since the MCB clock increments by 20 ms Real time means elapsed time or clock time Live time refers to the amount of time that the MCB is available to accept another pulse 1 e is not busy and is equal to the real time minus the dead time the time the MCB is not available Enter the ROI Peak count preset value in counts With
47. Sight controls for adjusting the peak display On the left is a vertical scrollbar for adjusting the vertical offset of the wave form The value of the offset is shown on the display Double clicking the mouse in the scrollbar will set the vertical offset to the vertical value of the channel at the marker position This lets you conveniently zoom in on a particular part of the waveform such as the tail for pole zero ing In the Auto trigger mode the display is updated every time a new pulse exceeds the trigger level To keep a single pulse displayed select Single Click on Reset to refresh the display to see the next pulse There will usually be one or two pulses in the pipeline that will be displayed before any change entered will be seen If the trigger is turned off the display will be redrawn periodically even if no pulse is there The Delay setting is the time delay between the pulse shown on the display and the trigger level crossing The value of the time delay is shown on the display 18 931049D 0914 2 GETTING STARTED Just as for the PHA mode display the vertical scale can be adjusted with the vertical adjust ments The display can be set to Log mode but the peak shapes do not have a familiar shape in this display The Auto mode will adjust the vertical scale for each pulse The pulse is shown before the amplifier gain has been applied so the relation between channel number and pulse height is not fixed The horizo
48. TE and SET_TIME SET_TRUE ticks Sets the true time counter to the specified number of ticks The number represents true time in units of 20 ms 50 ticks sec Normally this value is set by the DSPEC LF during data acquisition See also CLEAR_ COUNTERS and SHOW_TRUE SET_TRUE_PRESET ticks Sets the true time preset to the specified number of ticks 20 ms tick During data acquisition when the true time counter reaches the preset number of ticks the preset is complete and the acquisition is stopped Setting a true time preset to 0 ticks disables the preset See also CLEAR_PRESETS and SHOW_TRUE_PRESET SET_ULD value This sets the upper level discriminator to value in channels SET_UNCERTAINTY_PRESET percent Sets the uncertainty preset to the specified value in percent Percent is a floating point value from 0 99 9999 See also SHOW_UNCERTAINTY_PRESET SET_WINDOW start length Sets the window of interest to the specified start channel and number of channels The channels of spectral data in the window of interest are affected by commands such as CLEAR SET_DATA and WRITE If neither start nor length is provided the window is set to the maximum size allowed by the conversion gain specified The window of interest is 54 931049D 0914 4 FIRMWARE COMMANDS AND RESPONSES always set to the maximum size after a SET_DEVICE command or a SET_SEGMENT command SET_ZERO_ADJUSTMENT value Sets the zero stabilization adjustment to an arbitrary
49. TICOINCIDENT and SHOW_GATE SET_GATE_OFF Causes the DSPEC LF to ignore the state of the ADC gate input signal See also SET_GATE_COINCIDENT SET_GATE_ANTICOINCIDENT and SHOW_GATE SET_HV value This sets the HV bias to value in volts SET_ID id string Sets the sample id string This string can be up to 16 characters long and can be set to any arbitrary value The id string is intended to uniquely identify the sample being analyzed See also SHOW_ID Examples SET_ID Site 123 SET_INTEGRAL_PRESET count Sets the ROI integral preset to the specified count During data acquisition when the sum of the counts contained in the channels that have the ROI flag set reaches the integral preset count the preset is complete and the acquisition is stopped The actual number of counts in the ROI integral can exceed the preset value by up to 512 counts due to the pipelined archi tecture of the DSPEC LF Setting an integral preset to 0 counts disables the preset The integral preset can be set to from 0 disabled to 4294967295 counts See also CLEAR_ PRESETS and SHOW_INTEGRAL_PRESET SET_LENGTH_SAMPLE length Sets the number of points in the Insight mode display to the specified value Normally this setting would remain at 1000 50 931049D 0914 4 FIRMWARE COMMANDS AND RESPONSES SET_LIVE ticks Sets the live time counter to the specified number of ticks The number represents live time in units of 20 ms 50 ticks s Normally this va
50. The colors are the same as for the PHA mode None No channels are marked in the display PileUpReject The region marked indicates when the PUR circuit has detected pileup and is rejecting the marked pulses NegBLDisc This shows when the negative baseline discriminator has been triggered Typically this signal only marks the TRP reset pulse The signal is used 19 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 internally in the live time correction baseline restoration and pile up rejection circuits BaseLineR This shows when the baseline restorer is actively restoring the baseline PosBLDisc This shows when the positive baseline discriminator has been triggered The signal is used internally in the live time correction baseline restoration and pile up rejection circuits Busy When the DSPEC LF busy signal is active Busy shows in the Mark box It represents the dead time Gate This shows when the gate signal is present on the gate input connector If the Gate mode on the ADC tab see Fig 13 is set to Off then all regions are marked If the mode is set to Coincidence then the marked region must overlap the pulse peak that is must start before the beginning of the flattop and stop after the end of the flattop for the pulse to be counted If the mode is set to Anticoincidence then the marked region will show the pulses that are accepted That is the rejected peaks will not be marked Simply put in al
51. afety instructions that must be observed in order to avoid personal injury and or damage to equipment or other property These are DANGER Indicates a hazard that could result in death or serious bodily harm if the safety instruction is not observed WARNING Indicates 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 In addition the following symbols may appear on the product AN DANGER Hazardous voltage ATTENTION Consult the manual in all cases where this symbol is marked in order to determine the nature of the potential hazards and any actions that must be taken to avoid them Protective earth ground terminal Please read all safety instructions carefully and make sure you understand them fully before attempting to use this product Cleaning Instructions To clean the instrument exterior e Disconnect the instrument from the power source 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 and water solution Do not use abrasive cleaners e Allow the instrument to dry completely before reconnecting it to the power source vi ORTEC DSPEC LF 1 INTRODUCTION The ORTEC DSPEC LF gamma spectrometer combines small size the latest in digital signal
52. applications such as GammaVision ScintiVision ISOTOPIC etc The MDA preset calculation uses the following formula 27 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 MDA a y b c Counts Live time CorrectionFactor where a b and c are determined by the MDA criteria you choose Counts is the gross counts in an ROI that is 2 5x FWHM around the target peak energy Live time is evaluated in 40 second intervals for the MDA presets CorrectionFactor is the product of the calibration efficiency at the specified peak energy and the peak s branching ratio yield as listed in the working active library NOTE MAESTRO does not support efficiency calibration The efficiency component in the CorrectionFactor is set to 1 0 the preset field is labeled Correction instead of MDA and the preset is based on counting activity cA instead of becquerels You can enter the MDA preset either in counts or corrected for factors such as sample volume attenuation or calculated efficiency For example if you manually calcu late the efficiency for a peak you can enter a corrected MDA target value by multi plying the desired MDA value times the calculated efficiency and entering the product as the Correction To add an MDA preset enter the preset value in the MDA or Correction field select the Nuclide and Energy enter the desired values for coefficients a b and c then click Add New To edit an existing preset
53. arity lt 0 025 over top 99 5 of spectrum measured with a mixed source Fe at 5 9 keV to Y at 1836 keV e Differential Nonlinearity lt 1 measured with a BNC pulser and ramp generator System Temperature Coefficient Gain lt 50 ppm C typically lt 30 ppm C e Offset lt 3 ppm C with rise and fall times of 12 us and flattop of 1 us similar to analog 6 us shaping Overload Recovery At maximum gain recovers to within 2 of rated output from x1000 overload in 2 5 non overloaded pulse widths measured using the InSight Virtual Oscilloscope Pulse Pileup Rejector Automatically set threshold Pulse pair resolution typically 500 ns Automatic Digital Pole Zero Adjustment Can be set automatically or manually Remote diagnostics via Insight Virtual Oscilloscope mode in MAESTRO Digital Gated Baseline Restorer Software controlled adjustment of the restorer rate Fast Slow and Auto ADC Gate Not available for PLUS transistor reset preamplifier or SMART 1 detectors Accepts a positive TTL input via the DIM s Inhibit BNC Signal must occur prior to and extend 0 5 us beyond peak detect Software selectable as off coincidence and anticoincidence LLD Digital lower level discriminator set in channels Hard cutoff of data in channels below the LLD setting ULD Digital upper level discriminator set in channels Hard cutoff of data in channels above the ULD setting Ratemeter Monitor the input count rate on t
54. ch is an ASCII representation of a 16 bit decimal number with the following bit definitions Bit 0 LSB Bias supply polarity O positive 1 negative Bit 1 Bias supply overload O overload 1 normal Bit 2 High voltage enabled O disabled 1 enabled Bit 3 Unused Bit 4 Amplifier PZ d since initialization O normal 1 needs PZ ing Bit 5 Optimization since initialization O normal 1 needed Bits 6 7 Unused Bit 8 Amplifier automatic PZ 1 Auto PZ in progress 0 normal Bit 9 Optimization O normal 1 in progress Bits 10 14 Unused Bit 15 MSB Reserved 67 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 SHOW_THRESHOLD_AUTOMATIC See also SET_THRESHOLD_ AUTOMATIC Responses IT lt CR gt Automatic threshold is enabled IF lt CR gt Automatic threshold is disabled SHOW_THRESHOLD_ NEGATIVE See also SET_THRESHOLD_NEGATIVE Responses THR_NEG 0000379791 Negative threshold is 379791 SHOW_THRESHOLD POSITIVE See also SET_THRESHOLD_POSITIVE Responses THR_POS 00000126811 Positive threshold is 126811 SHOW_TIME Reports the time from the battery backed up system clock in the form Nhhhmmmsssccc lt CR gt where hhh represents a 3 digit integer hour 0 23 mmm represents a 3 digit integer minute 0 59 and sss represents a 3 digit integer second 0 59 See also SET_TIME SET_DATE and SHOW_DATE Example Responses N010054017052 lt CR gt Time returned 10 54 17 10 h 54 min 17
55. current real time live time and count rate are monitored at the bottom of the dialog Gate This control allows you to select a positive TTL logic level gating function With gating Off no gating is performed that is all detector signals are processed with gating in Coinci dence mode a gating input signal must be present at the proper time for the conversion of the event in Anticoincidence mode the gating input signal must not be present for the conversion of the detector signal The gating signal must occur prior to and extend 500 ns beyond peak detect peak maximum Conversion Gain Sets the maxi for DSLF 3472 mum channel number in the spectrum If set to 16384 the energy scale will High Voltage About Status Presets MDAPreset Kee Amplifier Amplifier2 AmplifierPRO ADC Stabilizer be divided into 16384 channels The 3 ale i i conversion gain is entered in powers T Conversion Gain REE of 2 e g 8192 4096 2048 The JDT Mode Lower Level Disc 50 up down arrow buttons step through T Upper Levei Dic hea E the valid settings for the DSPEC LF a The Lower Level Discriminator sets l i Real Time Live Time the level of the lowest amplitude 0 00 0 00 Count Rate 0 pulse that will be stored This level establishes a lower level cutoff by channel number for ADC conversions Figure 13 DSPEC LF ADC Tab The Upper Level Discriminator sets the level of
56. e is not supported the bit is 0 pa Meaning Software selectable conversion gain Software selectable coarse gain Software selectable fine gain Gain stabilizer Zero stabilizer PHA mode functions available MCS mode functions available List mode functions available Sample mode functions available Digital Offset e g 920 Software selectable analog offset Pg So O HV power supply Enhanced HV SET_HV SET SHOW_HV_POL SHOW_HV_ACT Software selectable HV range ENA_NAL DIS_NAT Auto PZ START_PZ_AUTO a ua RW N 35 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 Bit 15 16 17 18 19 20 21 7 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 36 Meaning Software selectable manual PZ SET SHOW_PZ Battery backed real time clock SHOW_DATE TIME SHOW_DATE TIME_START Sample changer support SET SHOW_OUTPUT SHOW_INPUT One button acquisition ENA DIS SHOW_TRIG_SPEC MOVE Nomadic likely to move between opens Local app data SET_DATA_APP SHOW_DATA_APP Software retrievable serial number Power management commands Battery status support SHOW_STAT_BATT Software selectable AMP polarity SET SHOW_GAIN_POLAR Support for flattop optimization ENA DIS_OPTI Stoppable AutoPZ STOP_PZ_ AUTO Network support e g DSPEC Multi drop serial support e g MicroNOMADS Software selectable DPM address SET_DPM_ADDR
57. en application from the PC e ORTEC s easy automatic pole zero adjustment and automatic baseline restorer e The highly accurate Gedcke Hale extended live time correction method 1 2 DSPEC LF SMART 1 HPGe Detector Support ORTEC s SMART 1 Detector technology is a great advance in the operation of HPGe detectors and is a major enhancement to data and chain of custody integrity The SMART 1 HPGe detec tor has the high voltage included so the DSPEC LF does not contain a high voltage power sup ply For older detectors a detector interface module DIM is used to supply the HV for the detector The SMART 1 HPGe detector monitors and reports on vital system functions Also its identifi cation serial number can be read by a controller such as the DSPEC LF For more security it can save authentication codes written to it and report the code at a later time The authentication code value is replaced with every start command At the end of the acquisition both the serial number and code are read and checked with the values at the start of the acquisition ORTEC SMART 1 HPGe Detectors monitor the following conditions Preamplifier 24 and 12 V values read only Preamplifier voltage out of range read only Detector element temperature read only Detector high voltage value read only Detector high voltage state on off Detector overload state read only Detector high voltage shutdown state read only Detector serial numb
58. ent List The last line on the display gives the firmware version for this DSPEC LF 2 1 1 2 Controls ON OFF To power up the DSPEC LF press ON OFF It takes approximately 3 seconds for the display to appear To turn off the instrument press ON OFF The DSPEC LF is designed to avoid accidental power down so acquisition isn t interrupted The display will ask you to confirm shutdown Press the backlight button O to power down or ON OFF O to ignore the shutdown command This is shown on the display Backlight button Press to turn the display backlight on and off 2 1 2 Rear Panel Figure 4 shows the rear panel e 12 15 V DC Connects to the accompanying ac dc power adapter e DETECTOR Attach to the SMART 1 HPGe detector or DIM cable 931049D 0914 2 GETTING STARTED WARNING ORTEC DSPEC LF NO USER SERVICEABLE PARTS OPENING CASE VOIDS WARRANTY E IN USA U S A PATENTS _ R 232 5 821 533 12 15VDC gt 5 872 363 E el Sia SB USB CHANGE fe READY IN 5 912 825 6 327 549 MAX PWR cow e O Sd DETECTOR Figure 4 DSPEC LF Rear Panel e USB Connects to the host computer Note that you can connect to and disconnect from the computer without restarting Windows or MAESTRO However if you disconnect with MAESTRO running an error message will be generated When you reconnect to the computer you must reselect this MCA from MAESTRO s detector droplist as described in the MAESTRO user manual 2 2 Soft
59. ent value of the 24 volt supply in the DIM as delivered to the detector High Voltage The current value of the high voltage bias supply in the DIM as delivered to the detector Detector temperature For SMART 1 detectors only the detector temperature at the time spectrum acquisition stopped for the spectrum currently in memory Live detector temperature For SMART 1 detectors only the real time current detector temperature 2 3 8 Presets Figure 18 shows the Presets tab MDA presets are shown on a separate tab The presets can only be set on an MCB that is not acquiring data during acquisition the preset field backgrounds are gray indicating that they are inactive You can use any or all of the presets at one time To disable a preset enter a value of zero If you disable all of the presets data acquisition will continue until manually stopped r Properties for DSLF 3472 Amplifier Ampifier2 AmplifierPRO ADC Stabilizer High Voltage About Status Presets MDAPreset U taint Real Time s ee Preset in 4 Live Time s Start Chan 0 Ol Peak cnt dl as i width 1 ROI Integral ents Suggest Region Overflow Close Figure 18 DSPEC LF Presets Tab 25 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 The values of all presets for the currently selected MCB are shown on the Status Sidebar These values do not change as new values are entered on the
60. er read only Detector authentication code read write Patent number 5 872 363 Patent number 5 912 825 Ron Jenkins R W Gould and Dale Gedcke Quantitative X Ray Spectrometry New York Marcel Dekker Inc 1981 pp 266 267 2 931049D 0914 1 INTRODUCTION 1 2 1 SMART 1 HPGe Detector Construction In the SMART 1 HPGe Detector the controller and high voltage power supply are permanently attached to the detector endcap The cable is strain relieved and sealed This eliminates the pos sibility that the detector will suffer severe damage from moisture leaking into high voltage con nectors The controller can be positioned in any convenient place It does not interfere with shielding or other mounting hardware 1 2 2 Using Older Detectors For older detectors a detector interface module DIM is used The DIM is a compact size and can be attached directly to the detector itself keeping the length of the high voltage cable to the absolute minimum The DIM is only needed for non SMART 1 detector use The DSPEC LF uses the following DIMs for support of non SMART 1 detector systems e DIM POSGE For any non SMART 1 positive bias HPGe detector includes short leads with mating connectors for connecting to existing detector cabling 500 V to 5000 V e DIM NEGGE For any non SMART 1 negative bias HPGe detector includes short leads with mating connectors for connecting to existing detector cabling 500 V to 5000 V
61. he DSPEC LF display or PC screen Battery Internal battery backed up memory to maintain settings in the event of a power interruption Presets Multiple presets can be set on any or all of the following e Real Time Stops data collection when the real time reaches this value e Live Time Stops data collection when the live time reaches this value 32 3 SPECIFICATIONS ROI Integral Integral count stops data collection when the sum of counts in all ROI channels reaches this value ROI Peak Peak count stops data acquisition when the count in any ROI channel reaches this value maximum value of 2 1 counts 2x107 Uncertainty Sets the required statistical accuracy on a key peak for example stop counting when the activity of Co is known to be better than 5 Multi Nuclide MDA Stops data collection when the value of the minimum detectable activity MDA for up to 20 user specified MDA nuclides reaches the needed value The presets are implemented in hardware so the computer does not have to poll the DSPEC LF for the preset to operate See Section 2 3 9 for details on the MDA preset calculation Data Overflow Terminates acquisition when data in any channel exceeds 2 1 2x10 counts Digital Spectrum Stabilizer Stabilization Peak centroid zero and gain channel 2 to 16384 stabilization window width zero and gain 1 to 256 channels Zero Correction Resolution 64 channels with a minimum adjustment of 0 1 channel out
62. he powered on ORTEC MCBs on the local computer and the network and display the list of instruments found the Master Instrument List Fig 6 If you wish you may enter customized instrument ID numbers and descriptions Section 2 2 4 2 When you close the dialog any changes you have made to an ID number or description will be written back to the corresponding MCB 11 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 f Configure Instruments Version 8 01 Number amp Description 1 DSPec DSPec DS50 00P2U2 MCB 1 DS50 11195158 MCB 1 DS50 11195158 MCB 2 Station 6 Right Station 5 Left Station 3 13 Station 4 14 DSPEC PRO MCB 129 Somme wr Instr Input System Close Cancel Help Renumber All Renumber New Figure 6 MCB Numbering and Descriptions 2 2 4 1 Configuring a New Instrument The first time a new instrument is detected the dialog shown in Fig 7 will remind you that all new instruments must be assigned a unique non zero ID number Click OK You can either manually change the ID Number and Description as described in the next subsection or you can click the Renumber New button to renumber only the new instruments This is the first time you have configured these detectors All detectors must have an ID number Since none of your detectors have ID numbers it is recommended that you press Renumber All to establish initial ID numbers for your detect
63. he preamplifier shuts down for any reason 73 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 Bit 74 8 Description Security Power Comment At the start of the acquisition the DSPEC LF queries the SMART 1 HPGe Detector for its serial number The DSPEC LF then writes a random number to the SMART 1 HPGe Detector At the end of the acquisition both numbers are read from the SMART 1 HPGe Detector and compared to the original values If there is a mismatch the Security SOH bit is set Set if the power fails during an acquisition Acquisition presets aperos 25 ADE SEP 32 tha aa dedos 21 AMUCOINCIENCO 40 2d adas 21 Ballistic deficit and flattop 4 Baseline Restorer seta vs 15 CO InCidEnCE matian arda Saw EE ARSEN 21 Count rales A ara E a Gd 15 16 Dead time A eee ee 26 DSPEC LF ADE SAD e ds 21 amplifier settings ovio 14 16 anticoincidence ars 21 COMCIGENCS 268 Peder catalan te oad es 21 high voltage setup ss iaa dido 22 MSieht mode neasa alado 17 livetime pr selte esa to te dena iaa 26 lower level discriminator 21 MDA preset ias Pata denea 27 A a Re he tee oad Sle 15 OVETIOW PICSCU dardo 27 preamplifier type escitas cada 15 r al me presets patos rata decada 26 ROI integral preset sa iaa 26 ROI peak count preset o oo 26 stabilizer A e ta Rae eh ead oo 21 uncertainty preset asada ideo 26 upper level discriminator 21
64. in counts per second CPS RT 366 LT 36 6 RTP 200 0 LTP 210 0 DT 0 1 ICR 41 GainStab OFF ZeroStab OFF HV 0V SHDN SMART SMART 42 N21741A 92 K MCB ID 1 DSPEC LF V 028 Figure 2 The DSPEC LF Display Showing Presence of a SMART 1 Detector GainStab and ZeroStab show the current setting for the gain and zero stabilizers respectively DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 The next line shows the current high voltage setting HV the current high voltage status ON OFF SHDN shutdown or OVLD overload and the shutdown mode TTL ORTEC or SMART If a SMART 1 Detector is attached the DSPEC RT 36 6 LT 36 6 LF displays a line immediately beneath the high RTP 200 0 LTP 210 0 voltage line this line is blank for other detector types compare Figs 2 and 3 On the left are the DT 0 1 ICR 41 word SMART and the first eight characters of the Selise Clas cae Els OEE SMART 1 Detector s serial number This is the HV OV OVLD TTL same value returned by the SHOW_DET_SNUM command On the right is the detector temperature MCB ID 1 in kelvins L DSPEC LF V 028 J Figure 3 The DSPEC LF Display for a The next line shows the ID number for this Non SMART 1 Detector DSPEC LF as set by the MCB Configuration program and displayed in the Master Instrument List see the MAESTRO user manual for more information on the MCB Configuration program and the Master Instrum
65. ing via CONNECTIONS v6 11 or later MAESTRO runs under Micro soft Windows 8 7 XP Professional SP3 1 5 About this Manual This manual describes the DSPEC LF tells how to connect it in a complete spectroscopy sys tem gives instructions on configuring the hardware settings such as high voltage presets and gain and supplies the firmware commands and responses Complete details on using the control software are in the MAESTRO User s Manual as well as the manuals for GammaVision ScintiVision and our other spectroscopy software For the purposes of this manual when we refer to MAESTRO we mean the ORTEC MCA emulator analysis application you are using e g MAESTRO GammaVision Scinti Vision DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 Intentionally blank 2 GETTING STARTED 2 1 The DSPEC LF 2 1 1 Front Panel Figure 1 shows the DSPEC LF front panel ORTEC DSPEC LF Figure 1 DSPEC LF Front Panel 2 1 1 1 The Display The DSPEC LF has a 240 x 160 pixel LCD display for viewing counting settings and status high voltage setting and status stabilizer settings SMART 1 Detector status and shutdown mode Figure 2 shows the layout of display for a DSPEC LF with a SMART 1 Detector attached RT RTP LT and LTP are respectively the actual real time real time preset live time and live time preset DT and ICR are the dead time in percent and input count rate
66. ings of the baseline restore function See also SET_BLRE Response BLRE 10 0 100 0 10 100 Legal settings are 10 0 to 100 0 in steps of 1 45 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 LIST_CORR_FLAT Lists the valid settings of the flattop width See also SET_CORR_FLAT Response CORR_FLAT 1 0 992 0 255 Legal settings are from 1 to 0 992 in 255 0 1 256 steps LIST_GAIN_COARSE Lists the valid coarse gain settings Response GAIN_COAR 1 2 4 8 16 32 LIST_GAIN_CONV Lists legal conversion gain settings Response GAIN_CONV 512 1024 2048 4096 8192 16384 LIST_GAIN_FINE Lists the valid fine gain settings Response GAIN_FINE 0 45 1 0 88437 196607 0 45 to 1 in 108171 steps LIST_HV Lists the valid high voltage settings Response HV 0 5000 0 5000 0 to 5000 in 5000 steps LIST_ROL SAMPLE Lists the valid ROI sample settings Response ROI_SAMP PUR BLN BLRG BLD BUSY GATE RESV PKDET LIST_SHAP_CUSP Not used by the DSPEC LF included for backward compatibility LIST_SHAP_FLAT Lists the valid flattop width settings Response SHAP_FLAT 0 3 2 4 3 24 Settings are 0 3 to 2 4 in 22 steps of 0 1 us 46 931049D 0914 4 FIRMWARE COMMANDS AND RESPONSES LIST_SHAP_RISE Lists the valid rise time settings Response SHAP_RISE 0 8 23 0 4 115 Settings are 0 8 to 23 in 112 steps of 0 2 us LIST_SHUT Lists the valid shutdown settings Response SHUTDOWN TTL ORTEC SMART OFF
67. ithin a device that are considered for ROI integral and ROI peak presets SET_ROI MDA start numchans PeakNumber Sets the region to use to compute the gross counts in the MDA calculation PeakNumber is an optional parameter assumed 0 if not present that specifies which of up to 20 0 19 MDA Presets to change SET_ROL SAMPLE num Selects which control signals are displayed as an ROI on the captured waveform Only a single bit can be turned on at a time The following signals can be selected with the associated bit Bit 0 Pileup reject Bit 1 Negative baseline threshold Bit 2 Baseline restorer gate Bit 3 Positive baseline threshold Bit 4 Busy Bit 5 Gate Bit 6 Reserved 52 931049D 0914 4 FIRMWARE COMMANDS AND RESPONSES Bit 7 Peak detect Bit 8 Reserved SET_ROI UNCERTAINTY start chans Sets the region to be used for the uncertainty preset calculation See also SHOW_ROI_ UNCERTAINTY SET_SEGMENT No function in the DSPEC LF included for backward compatibility SET_SHAP_FLAT value Sets the width of the flattop to value Value is in microseconds ranging from 0 3 to 2 4 in steps of 0 1 See also SHOW_SHAP_FLAT SET_SHAP_RISE value Sets the rise time to value Value is in microseconds ranging from 0 8 to 23 0 in steps of 0 2 See also SHOW_SHAP_RISE SET_SHUTDOWN index Used in conjunction with the LIST_SHUTDOWN command to set the high voltage shut down setting Index specifies a position in the list of
68. ive C00001088 lt CR gt Active SHOW_BLRE Shows the baseline restorer time constant in microseconds See also SET_BLRE Responses BLRE 000000000000091 Time constant is 91 us SHOW_BLRE_AUTOMATIC Shows whether automatic selection of the baseline restorer constant is off or on Responses IT lt CR gt Automatic baseline is enabled IF lt CR gt Automatic baseline is disabled 55 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 SHOW_CONFIGURATION Returns a record that indicates the hardware configuration of the MCB The record contains information about the number of segments in an MCB device always 1 for the DSPEC LF and the current conversion gain for each segment The record is organized as follows J1638400001aaaaa00000 65 zeros here for total of 75 zeros 00000ccc where aaaaa represents the conversion gain for the one and only segment in the currently selected device and ccc represents the record checksum See the section on response records in this chapter for more information about response records and checksums SHOW_CONFIGURATION_MASK Returns two masks the first of which can be anded with data from the MCB to clear the ROI bit from the data When the second mask value is anded with data from the MCB the data bits are removed and only the ROI bit remains Response CONF_MASK 02147483647 02147483648 SHOW_CORRECTION_FLAT Shows the flattop correction value See also SET_CORR_FLAT
69. l modes the accepted peaks are marked Peak This is the peak detect pulse It indicates when the peak detect circuit has detected a valid pulse The Mark occurs about 1 5 us after the pulse maxi mum on the display On the lower right of the InSight display are the shaping parameter controls The controls are split into two groups and the other controls button switches between them One group includes Rise Time Flattop Tilt and the Optimize button The Rise Time value is for both the rise and fall times thus changing the rise time has the effect of spreading or narrowing the quasi trapezoid symmetrically The Flattop controls adjust the top of the quasi trapezoid The Width adjusts the extent of the flattop from 0 3 to 2 4 us The Tilt adjustment varies the flatness of this section slightly The Tilt can be positive or negative Choosing a positive value results in a flattop that slopes down ward choosing a negative value gives an upward slope Alternatively Optimize can set the tilt value automatically This value is normally the best for resolution but it can be changed on this dialog and in the InSight mode to accommodate particular throughput resolution tradeoffs The Optimize button also automatically adjusts the pole zero setting 20 931049D 0914 2 GETTING STARTED 2 3 3 ADC This tab Fig 13 contains the Gate Conversion Gain Lower Level Discriminator and Upper Level Discriminator controls In addition the
70. lue is set by the DSPEC LF during data acquisition See also CLEAR_COUNTERS and SHOW_LIVE SET_LIVE_PRESET ticks Sets the live time preset to the specified number of ticks 20 ms tick During data acquisition when the live time counter reaches the preset number of ticks the preset is complete and the acquisition is stopped Setting a live time preset to O ticks disables the preset See also CLEAR_PRESETS and SHOW_LIVE_PRESET SET_LLD chan Sets the lower level discriminator to chan which must be between 0 and 16383 See also SHOW_LLD SET_MDA_COEF a b c Sets the coefficients in the MDA preset calculation to the specified values A b and c are floating point values The MDA preset checks for the following condition to be met at b c CountsinROI MDA Preset gt Live Time The calculation is performed once every 30 seconds with i starting at 0 and advancing through each of up to 20 unique MDA presets i only advances once the preset has been met Note that a b and c are the same for each of the unique presets Only the ROI range and the MDA preset change when i advances Once i reaches 20 or MDAPreset equals 0 the acquisition terminates SET_MDA_ PRESET MDAPreset PeakNumber Sets the MDAPreset PeakNumber value as shown in the equation in the SET MDA_COEF description above MDAPreset is usually the product of the desired MDA the yield and the efficiency PeakNumber is a parameter that specifies which of up to 20 0
71. m the nominal value by more than the allowed limit the ERR is set until cleared by the program The numeric values are displayed in the units reported by the r Properties for DSLF 3472 Amplifier Ampifier2 Amplifier PRO ADC Stabilizer High Voltage About Status Presets MDA Preset DSLF 3472 Sample Acquisition Start Time Access 20 13 00 Friday November 08 2019 Read Write Firmware Revision Serial Number Acquisition Mode DSLF 028 00139 PHA Figure 16 DSPEC LF About Tab r Properties for DSLF 3472 Amplifier Amplifier2 Amplifier PRO ADC Stabilizer High Voltage About Status Presets MDA Preset Ok DIM 24 State Of Heath OK DIMAN State Of Heath OK E DIM 1N Stare OF Heath OK y DIM 24 State Of Health OK Jor Temperature State Of Health OK Close Figure 17 DSPEC LF Status Tab 23 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 DSPEC LF Detector temperature and Live detector temperature are available only for SMART 1 detectors For non SMART 1 detectors they return N A The parameters displayed are Detector State of Health OK if all the SOH are OK and ERR if any one is ERR DIM 24V State of Health OK if the 24 volt supply in the DIM has stayed within 200 mV of 24 volts since the last time the SOH was cleared DIM 12V State of Health OK if the 12 volt supply in the DIM has stayed within 200 mV
72. mode See also START_PZ_ AUTOMATIC TERM No function in the DSPEC LF included for backward compatibility TRIGGER Starts data acquisition if the trigger has been enabled ENABLE_TRIGGER VERIFY_CORR_FLAT VERIFY_SHAP_FLAT VERIFY_SHAP_RISE These test the argument against the list of valid settings and return true if valid 72 APPENDIX A STATE OF HEALTH BIT DEFINITIONS Following are descriptions of the SOH bit To monitor these within MAESTRO click on Acquire MCB Properties then on the Status tab see Fig 21 Bit Bb uu N r Properties for DSLF 3472 Amplifier Amplifier2 AmplfierPRO ADC Stabilizer High Voltage About Status Presets MDA Preset E ox DIM 24V State Of Heat OK GT DIMAN State OfHeath OK GT om 12 State OfHeath OK ET om 24 State OFHeath OK lor Temperature State Of Health OK Description 24V 12V 12 V 24V Figure 21 The SOH Status Tab within MAESTRO Comment The first four bits monitor the voltages coming from the DSPEC LF If one of these values varies by more than 2 V the corresponding bit is set Temperature Set if the detector temperature increases and shuts down the HV HV voltage Overload Shutdown therefore the SHUTDOWN bit will also be set Set 1f the high voltage deviates by more than 300 V from the value you entered in MAESTRO Set 1f the preamplifier overloads for more than about 4 0 seconds Set 1f t
73. ntal scale extends from 16 to 256 channels The display is expanded around the marker position which means that in some cases the peak will disappear from the display when it is expanded The display can be switched from the DSPEC LF to another detector or the buffer In this case the other detector will be shown in the mode selected for it The buffer will always be shown in PHA mode The display will return to the InSight mode when you return to the first DSPEC LF If you exit the program with the DSPEC LF in InSight mode it will be in InSight mode on the next startup The display can include a Mark to indicate one of the other signals shown in lt none gt gi Fig 12 The Mark is a solid color region displayed similarly to that of an PiclioFieect ROI in the spectrum This Mark can be used to set the timing for the gate NegBLDisc pulse It can also be used to set the shaping times and flattop parameters to Sacre get the best performance Busy Gate i Peak For example suppose you want to get the best resolution at the highest ae T throughput possible By viewing the pulses and the pileup reject marker you aes Display can increase or decrease the rise time to obtain a minimum of pileup reject Selection pulses Mark Types For the Mark choose either points or filled to the zero line display This is controlled by the selection in the Display Preferences menu item That choice does not affect the PHA mode choice
74. oe Sea tinee aed ute Came tethe met 19 Di Di Me ADG ig 8 tase ih ee Sie rd gate Set E gh ta toca aaa wee ew ae Dee ocd 21 Did As ADLER as Ce dh aed gue wee Ree Renda e Spe gin Ge WR nk OU Gta dam RE MEE eS 21 De O NOA an EEA 22 DO A AS AAA A nee ees 23 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 edt Ts ASAS UDI ES he Hees nd acs Bs SA Oe he ME eT AEE 23 IO ECCS it oats Bova DAA A A DA id 25 AS MDA Preset anra a RN 27 2 4 Setting the Rise Time in Digital MCBS 0 000 aa 29 2 9 Troubleshooting A AR a 30 2 5 1 MAESTRO Does Not Connect with the DSPEC LF 30 gt SPECIFICATIONS tarn a ar a Os 31 SE DN d a OS A Oy pute de eh E E BLES EEE EEE E T E ba 31 3 1 1 Electrical and Mechanical 2 ch oii os oe bv nS see Sos eC EM LESS OSs 33 Sel COMMCCIORS a Oe eG oe bars deine wb ele a hee AAA ne Bee rs 34 3 2 HPGe High Voltage Detector Interface Modules 00 000 e eee ee 34 3 3 F at re Mask BIS b 20 t cn c e ear aa ts 35 4 FIRMWARE COMMANDS AND RESPONSES 0 0 0 0000 000 cece eee eee 39 4 1 Command Format iaa e Klee ee nub weeks dra Bauer wes 39 Ad Eor CodeS a DAI AS AA OS DA 39 ADA Dollar Response Records rra ae 40 42 2 MCB COMMISSION taa E 41 APPENDIX A STATE OF HEALTH BIT DEFINITIONS 73 INDEX as a ri tr rie cone gd Aen ater eta a ath dati eee ara 75 Safety Instructions and Symbols This manual contains up to three levels of s
75. onfiguration 30 3 SPECIFICATIONS 3 1 DSPEC LF Display 240 x 160 pixel backlit LCD provides status information instrument ID bias information live and real time Maximum System Throughput gt 100 000 cps depends on shaping parameters System Gain Settings e Coarse Gain Settings 1 to 32 in binary steps 1 2 4 8 16 32 e Fine Gain 0 45 to 1 The available range of gain settings supports all types of HPGe detectors Specifically the following maximum energy values are achievable using the standard ORTEC preamplifier maximum to minimum gain e COAX 187 ke V 12 MeV e GLP SLP 16 5 ke V 1 MeV Amplifier Input Polarity Selectable via software System Conversion Gain Software selectable as 16384 8192 4096 2048 1024 or 512 channels Preamplifier Software selectable as either resistive or TRP preamplifier Digital Filter Shaping Time Constants e Rise time 0 8 us to 23 us in steps of 0 2 us e Flattop 0 3 to 2 4 in steps of 0 1 us Dead Time Correction Extended live time correction according to Gedcke Hale method Accuracy area of reference peak changes lt 3 from 0 to 50 000 cps Low Frequency Rejector LFR When ON removes low frequency lt 3 kHz input noise from spectrum For the legacy LO AX and IGLET X detector types the respective energy ranges are 94 keV 6 MeV and 8 ke V 500 keV 31 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 Linearity e Integral Nonline
76. or on the back of the DSPEC LF and causes the DSPEC LF to suppress State of Health information see SHOW_HV_HEALTH command Also the command disables polling of a standard DIM module e g DIM POSNAIT DIM POSGE DIM NEGGE or DIM 296 by the DSPEC LF DISABLE_NAI Switches the stabilizers to Ge mode See ENABLE_NAI DISABLE_OPTI_NEED Disables the reporting of an error when the DSPEC LF has not been optimized DISABLE_OVERFLOW_PRESET Disables the overflow preset Channels that receive a count when they contain 2147483647 counts the maximum number of counts will roll over to zero counts if the overflow preset is disabled See also ENABLE _OVERFLOW_PRESET and SHOW_OVERFLOW_PRESET DISABLE_PZ_AUTOMATIC Disables the automatic pole zero mode See also ENABLE_PZ_AUTOMATIC DISABLE_PZ_NEED Disables the reporting of an error when the DSPEC LF has not been pole zeroed DISABLE_ REMOTE No function in the DSPEC LF This command has been included for backward compatibility DISABLE_ZERO_STABILIZATION Stops stabilization of the zero peak while data is being acquired The zero stabilization adjustment is held at its current value until either zero stabilization is reenabled with the 43 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 ENABLE_ZERO_ STABILIZATION command or reinitialized with the INITIALIZE_ZERO_ STABILIZATION SET_ZERO CHANNEL or SET_ZERO_ WIDTH commands See also SHOW_ZERO_ STABILIZATION ENABLE BLR
77. ors Figure 7 New Instruments Must Have a Non Zero ID Number NOTE We strongly recommend not using the Renumber All button In addition we strongly recommend not renumbering MCBs that belong to other users as this could affect the interaction between their MCBs and their ORTEC software for instance if they control their MCBs with JOB files e g the JOB file command SET_DETECTOR 5 or use the GammaVision or ISOTOPIC spectroscopy applications See also the NOTE FOR MULTIPLE USERS ON A NETWORK in the next section 2 2 4 2 Customizing ID Numbers and Descriptions If you wish you can change the instrument ID Numbers and Descriptions by double clicking an instrument entry in the Configure Instruments dialog This will open the Change Description or ID dialog Fig 8 It shows the physical MCB location read only and allows you to change the ID Number and Description If this is a first time installation of ORTEC products all your instruments will be new 12 931049D 0914 2 GETTING STARTED f Change Description or ID Instrument Input System ID 132 1 USER PC 19 fare Cancel Description Figure 8 Change MCB Number or Description Make the desired changes and click Close Any changes you have made to an ID number or description will then be written back to the corresponding MCB NOTE FOR MULTIPLE USERS ON A NETWORK There are two ways to reduce the chance that other user
78. orted as disabled G0000000001076 lt CR gt True time preset reported as 1 tick G4294967295132 lt CR gt True time preset reported as 4294967295 ticks SHOW_TRUE_REMAINING Reports the current true time remaining in units of 20 milliseconds 50 ticks per second See also SET_TRUE_REMAINING Responses G0000000000075 lt CR gt True time remaining reported as disabled G0000000001076 lt CR gt True time remaining reported as 1 tick G4294967295132 lt CR gt True time remaining reported as 4294967295 ticks SHOW_ULD Returns the value of the ULD in channels as a C record 69 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 SHOW_UNCERTAINTY Returns the current value of the uncertainty for the peak in the uncertainty preset See also SET_UNCERTAINTY Responses UNCE 0000000000008 5 Uncertainty of the peak is 8 5 SHOW_UNCERTAINTY_PRESET Returns the current uncertainty preset setting See also SET_UNCERTAINTY_PRESET Responses UNCE_PRES 000000000000000 No preset UNCE_PRES 0000000000008 5 Preset set to 8 5 SHOW_VERSION Reports the DSPEC LF firmware version number in the form Fmmmm vvv lt CR gt where mmmm is a 4 character model designator and vvv is a 3 character version designator Example Responses FDSLF 028 lt CR gt Model DSPEC LF firmware version 28 reported SHOW_WINDOW Reports the start channel and number of channels in the window of interest in the form Dxxxxxyyyyyccc lt CR gt
79. processing and filters and high speed USB data transfer with the proven performance of the ORTEC DSPEC line of instruments 1 1 Why the DSPEC LF High Speed USB Interface Connect the DSPEC LF via high speed USB to any computer run ning under Microsoft Windows 8 7 or XP SP3 A nearly unlimited number of DSPEC LFs as well as any combination of other ORTEC USB instruments can be connected to your com puter via USB hubs and across the network As an ORTEC CONNECTIONS multichannel buffer MCB the DSPEC LF works in both standalone and networked configurations Single Cable Connection to Detectors The DSPEC LF uses the unique ORTEC Detector Interface Module DIM for single cable connection between the DSPEC LF and the detector The DIM is designed to supply bias close to the detector so the cable carries only signal and low voltage power no longer is high voltage bias with its associated dangers carried over long distances SMART 1 Support Detectors equipped with the SMART 1 technology have their recom mended bias values preset at the factory No more shuffling through paperwork or looking for tags on the detector to find the right bias setting Simply turn on the electronics and the SMART 1 detector senses the detector temperature and applies the right high voltage bias Our SMART 1 detectors also allow our more recent MCBs such as the DSPEC 50 and digi DART to monitor and display detector state of health SOH during ac
80. ptimization for each possible rise time Optimization requires a source with sufficient activity to register between 800 cps and 5000 cps Arrange the detector in its final configuration Turn on the HV so the instrument is processing pulses then place the source on or near the detector endcap A count rate guidance message on the lower left of the Amplifier page will help you position the source to deliver the correct count Patent number 5 821 533 15 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 rate for optimization You may also right click in the spectrum window and select Input Count Rate from the context menu to view the count rate meter The Start Auto optimization button will remain disabled gray until the count rate is suitable Click it to start A series of short beeps indicates optimization is in progress When optimizing is complete the beeping will stop The process can take from 1 to 10 minutes depending on count rate but typi cally takes 5 minutes The effect of optimization on the pulse can be seen in the InSight mode on the Amplifier 2 tab Note however that if the settings were close to proper adjustment before starting optimization the pulse shape might not change enough for you to see In this situation you also might not notice a change in the shape of the spectrum peaks The most visible effect of incorrect settings is high or low side peak tailing or poor resolution 2 3 2
81. quisition including detector temperature preamplifier power bias overrange and bias on off state This continuous SOH monitoring ensures the integrity of the acquired data A quick check of the SOH flag in the SMART 1 detectors shows if any parameter deviated from specification during the measure ment This is vitally important for environmental samples that must be counted for long periods of time and regulatory driven samples where chain of custody integrity means everything For more information on our SMART 1 technology see Section 1 2 Dynamic LCD Display The backlit DSPEC LF LCD panel displays the instrument ID name preset count conditions current live and real time dead time percentage if active input count rate HV status and value and the serial number for SMART 1 detectors Desktop Housing The DSPEC LF with the same small footprint as its predecessor the DSPEC jr 2 0 sits right on the desktop Lightweight but rugged DSPEC LFs can be stacked on top of one another via their interlocking cases without fear of sliding or tipping Use a USB hub to quickly connect multiple instruments to the PC DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 The DSPEC LF also offers these features e Highly stable peak shape and peak position with temperature and count rate a hallmark of our DSPEC family of MCBs e The InSight Virtual Oscilloscope mode which makes it easy to optimize detector performance for a giv
82. r consistent with that requirement Enter the rise time that best matches your dynamic range of count rate note that the available rise time settings will vary by instrument this chart is a general guide only The longest rise time shown in the table is 12 us even though some digital instruments can be set for rise times as long as 23 us If throughput is not an issue because all samples are low rate increasing the rise time beyond 12 us might achieve a small improvement in resolution For planar detectors such as ORTEC s GLP Si Li IGLET and IGLET X Series operating at longer rise times frequently gives improved resolution 29 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 Table 2 Rise Time Selection Guide Dynamic Range Throughput EAN ME A E osa 0000 os oa esoo os 2 5 Troubleshooting 2 5 1 MAESTRO Does Not Connect with the DSPEC LF If properly installed and functioning MAESTRO software or other CONNECTIONS 32 programs cannot find and communicate with the DSPEC LF check for the following e The DSPEC LF is not turned on e The USB cable is not properly connected e Check the Master Instrument List on the PC to ensure that the DSPEC LF is on the list If it is not listed shutdown and restart the DSPEC LF then re run the MCB Configuration program according to Section 2 2 4 See the CONNECTIONS Driver Update Kit instructions for more detailed information on using MCB C
83. r the preset is entered without affecting the uncertainty calcu 26 931049D 0914 2 GETTING STARTED lation If the marker is not positioned in an ROI the start channel is 1 5 times the FWHM below the marker channel and the width is 3 times the FWHM The net peak area and statistical uncertainty are calculated in the same manner as for the MAESTRO Peak Info command Marking the Overflow checkbox terminates acquisition when data in any channel exceeds 2 1 gt 2x10 counts 2 3 9 MDA Preset The MDA preset Fig 19 can monitor up to 20 nuclides at one time and stops data collection when the values of the minimum detectable activity MDA for all of the user specified MDA nuclides reach the needed value Presets are expressed in Bq and are evaluated every 40 seconds The detector must be calibrated for energy in all spectroscopy applications and for efficiency in all applications but MAESTRO Properties for DSLF 3472 Amplifier Amplifier2 AmpifierPRO ADC Stabilizer High Voltage About Status Presets MDA Preset MDA Preset Nuclide Energy MDA Preset Coefficients Correction c A 10 000000 Nuclide Pu 238 B 10 000000 Energy ke C 0 000000 Figure 19 DSPEC LF MDA Preset Tab The MDA presets are implemented in the MCB i e the entries you make on this screen are saved in the MCB memory and have no direct link to MDA methods selected in the analysis options for
84. s designed to expose any flaws in materials or workmanship Permanent records of these tests are maintained for use in warranty repair and as a source of statistical information for design improvements Repair Service If it becomes necessary to return this instrument for repair it is essential that Customer Services be contacted in advance of its return so that a Return Authorization Number can be assigned to the unit Also AMT 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 AMT standard procedure requires that instruments returned for repair pass the same quality control tests that are used for new production instruments Instruments that are returned should be packed so that they will withstand normal transit handling and must be shipped PREPAID via Air Parcel Post or United Parcel Service to the designated AMT repair center The address label and the package should include the Return Authorization Number assigned Instruments being returned that are damaged in transit due to inadequate packing will be repaired at the sender s expense and it will be the sender s responsibility to make claim with the shipper Instruments not in warranty should follow the same procedure and AMT
85. s will renumber your MCBs e Add the I flag to their MCB Configuration command line as described in the CONNECTIONS Driver Update Kit instructions This will allow you to assign whatever ID Numbers you wish regardless of the numbers assigned by other users on your network Ideally everyone using ORTEC instruments on your network should make this change To prevent others from renumbering your MCBs or performing any other actions except read only viewing password lock your MCBs with the MAESTRO Lock Unlock Detector command If you lock a detector that will be controlled by a JOB stream remember to include the proper password unlock commands in your JOB file see the MAESTRO user manual If a modified description has already been applied to a particular instrument you can restore the default description by deleting the entry in the Description field and re running MCB Config uration After MCB Configuration runs the default description will be displayed 2 2 5 Attaching More Than One DSPEC LF to the Computer Once the drivers have been installed for one DSPEC LF adding subsequent units is simple REMINDER Be sure to run MCB Configuration any time you add new DSPEC LFs or other ORTEC MCBs to your system or when you move an instrument from one USB port to another 13 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 2 2 6 Connecting to and Disconnecting from the Computer The USB connection allows
86. sabled TRP SHOW_RADIX SHOW_REMOTE No function in the DSPEC LF included for backward compatibility SHOW_ROI Used in conjunction with the SHOW_NEXT command SHOW_ROI reports the first continuous group of channels that have the ROI flag set The response is of the form Dsssssnnnnnccc lt CR gt where sssss represents an integer number that is the number of the first channel of the first group of channels that all have their ROI bit set and nnnnn represents an integer number 65 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 that is the number of channels in the group The SHOW_NEXT command is used to report the next group of channels that all have their ROI bit set Responses D0100000050078 lt CR gt First ROI group starts at channel 1000 and is 50 channels long D0215000150086 lt CR gt First ROI group starts at channel 2150 and is 150 channels long D0000000000072 lt CR gt No ROI groups to report SHOW_ROI MDA Reports the start channel and number of channels used in the MDA preset calculation Example Response D0700000050ccc Calculation is performed on channels 7000 7049 SHOW_ROI SAMPLE Displays the ROI Sample setting See also SET_ROI_SAMPLE Responses C00001088 SHOW_ROIUNCERTAINTY Reports the start channel and number of channels used in the uncertainty preset calculation See also SET_ROI_UNCERTAINTY Response D0700000050ccc Calculation is performed on channels 7
87. string2 the data 128 bytes maximum SET_DATE day month year Sets the date stored in the battery backed up system clock to the specified values Day can be any value from 1 31 month any value from 1 12 and year any value from 0 99 The cur rent date and time are stored for a device when an acquisition is started See also SHOW_ DATE SET_TIME and SHOW_TIME SET_DATE_START day month year Sets the start date to the specified values Normally the start date and time are set automati cally whenever a device is started with the START command See also SHOW_DATE_ START SET_TIME_START and SHOW_TIME_START SET_DELAY_COLLECTION value Controls the pileup rejector by setting a width threshold such that if a fast channel discrimi nator pulse is wider than value the pulse is rejected This portion of the pileup rejector rejects pulses that are too close together to be detected separately by the fast channel Value is in microseconds with a range from 0 250 to 1 6 in steps of 0 05 See also SHOW_ DELAY_COLLECTION SET_DELAY_SAMPLE num Delays the waveform collected in InSight mode by num points Num must be between O and 65535 See also SHOW_DELAY_SAMPLE SET_DEVICE SET_FRONT_BYPASS No function in the DSPEC LF included for backward compatibility SET_GAIN_ADJUSTMENT value Sets the gain stabilization adjustment to an arbitrary value from 65535 to 65535 This adjustment is usually made only by the gain stabilizer and reset to O with the INITI
88. such as the underscore _ and comma 13 in the prototype line are literal text to be sent to the MCB exactly as they appear Lowercase letters in the prototype line represent numeric values as described in the accompanying text they should not be sent literally to the MCB but should be replaced by an appropriate numeric value In this section the term lt CR gt represents the ASCII carriage return character decimal value 13 and the character _ represents the ASCII underscore character decimal value 95 CLEAR The channels of spectral data in the window of interest see SET_WINDOW command are set to zero The live time and true time counters are also set to zero This command is equivalent to the combination of CLEAR_COUNTERS and CLEAR_DATA commands 41 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 CLEAR_ALL This command is equivalent to the combination of CLEAR_COUNTERS CLEAR_DATA CLEAR_PRESETS and CLEAR_ROI commands CLEAR COUNTERS The live time and true time counters are set to zero CLEAR_DATA The channels of spectral data in the window of interest see SET_WINDOW command are set to zero The ROI flags are not changed nor are the presets changed CLEAR_HV_HEALTH Clears resets the state of health bits This command clears the SOH bits in the DIM and does not affect the stored SOH which is reported when the instrument is not acquiring data CLEAR_MDA_PRESET Clears all MCA preset
89. th adjusts the extent of the flattop from 0 3 to 2 4 us The Tilt adjustment varies the flatness of this section slightly The Tilt can be positive or negative Choosing a positive value results in a flattop that slopes down ward choosing a negative value gives an upward slope Alternatively the optimize feature on the Amplifier tab can set the tilt value automatically This automatic value is normally the best for resolution but it can be changed on this dialog and in the InSight mode to accommodate particular throughput resolution tradeoffs The optimize feature also automatically adjusts the pole zero setting The dead time per pulse is approximately 3 x Rise Time 2 x Flattop Width In the Pole Zero section the Start button performs a pole zero at the specified rise time and other shaping values Unlike the optimize feature it performs a pole zero for only the one rise time The pole zero Stop button aborts the pole zero and is normally not used For the more advanced user the InSight mode lets you directly view all the parameters and adjust them interactively while collecting live data To access the InSight mode go to the Insight section on the Amplifier 2 tab and click Start The InSight mode is discussed in more detail in the following section When you are satisfied with the settings you are ready to acquire data Once data acquisition is underway you may wish to return to MCB Properties and click the Insight section
90. th has not been set C00003089 lt CR gt Zero width is 3 channels lowest possible width C00256100 lt CR gt Zero width is 256 chamnels highest possible width in Gauss mode C16383108 lt CR gt Zero width is 16383 channels highest possible width in point mode with zero channel set to 8192 START seg mask Starts the acquisition of spectral data The optional segment mask is provided for compatibility with other MCBs and can be any value from 0 to 65535 but is ignored by the DSPEC LF START_FLAT_AUTO Performs optimization of PZ and flattop correction for a single rise time instead of all rise times START_OPTIMIZE Starts optimization of PZ and flattop correction for all rise times 71 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 START_PZADJUST_AUTO Starts the automatic PZ process The automatic PZ is not complete until indicated by the auto PZ status bit This bit is returned by the SHOW_STATUS command Spectral data can be corrupted if automatic PZ is initiated while a device is collecting data STOP seg mask Stops the acquisition of spectral data The optional segment mask is provided for compatibility with other MCBs and can be any value from 0 to 65535 but is ignored STOP_OPTIMIZE Stops the optimization in progress The DSPEC LF could be in an indeterminate mode See also START_OPTIMIZE STOP_PZ_AUTOMATIC Stops the optimization in progress The DSPEC LF could be in an indeterminate
91. the command the MCB returns a macro error code and micro error code The macro error code represents the general class of error with O meaning no error and the micro error code represents the sub class of error with O meaning no error In case of error con dition you can use the MIOGetLastError DLL interface or GetErrMajor GetErrMinor ActiveX control interface Macro error codes 0 Success gt Power up just occurred Battery backed data lost 39 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 E 132 Invalid Command For macro code 129 syntax error or 131 execution error the following apply 129 Micro error codes Success Input already started stopped 2 Preset already exceeded Input not started stopped Parameter was rounded for decimal numbers No sample data available 4 2 1 Dollar Response Records SHOW and STEP commands respond with a single dollar response record followed immediately by a percent response record All valid dollar response records for each command are listed in the command dictionary The following list provides the general form of each dollar response record for the MCB API In this list lower case letters represent numeric values The letters ccc always represent an 8 bit 40 931049D 0914 4 FIRMWARE COMMANDS AND RESPONSES unsigned checksum of all characters on the record up to but not including the checksum charac ters and lt CR gt
92. the high voltage module will be hardwired to the detector To support older detectors a detector interface module DIM with 12 inch leads connect the detector and DSPEC LF providing HV bias and control The leads are as follows 9 pin D preamplifier power cable Analog In Shutdown In Bias Out Inhibit In The DSPEC LE uses the following DIMs e DIM POSGE For any non SMART 1 positive bias HPGe detector includes leads with mating connectors for existing detector cabling 500 V to 5000 V 34 3 SPECIFICATIONS e DIM NEGGE For any non SMART 1 negative bias HPGe detector includes leads with mating connectors for existing detector cabling 500 V to 5000 V e DIM POSNAI For any positive bias Nal detector includes leads with mating connectors for existing detector cabling 100 V to 1800V 300 uA e DIM 296 For any positive bias Nal detector includes Model 296 ScintiPack tube base preamplifier bias supply for Nal detectors with 14 pin 10 stage photo multiplier tubes 0 V to 1200 kV In all cases except the DIM 296 the bias voltage setting and shutdown polarity are set via MAESTRO or other CONNECTIONS software The SMART 1 detector provides detector state of health information as discussed above and in Section 1 2 3 3 Feature Mask Bits The following table describes the feature bits from the SHOW_FEATURES command discussed on page 58 If the feature is supported in the DSPEC LF the bit is set to 1 if the featur
93. the highest amplitude pulse that will be stored This level establishes an upper level cutoff by channel number for storage 2 3 4 Stabilizer The Stabilizer tab Fig 14 allows you to adjust and monitor the gain and zero stabilizers which are discussed in detail in the MAESTRO user manual The value in each Adjustment section shows how much adjustment is currently applied The Initialize buttons set the adjustment to 0 If the value approaches 90 or above the amplifier gain should be adjusted so the stabilizer can continue to function when the adjustment value reaches 100 the stabilizer cannot make further corrections in that direction The Center Channel and Width fields show the peak currently used for stabilization 21 DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 To enable the stabilizer enter the for DSLF 3472 Center Channel and Width values manually or click on the Suggest Region button Suggest Region High Voltage About Status Presets MDAPreset Amplifier Amplifier2 AmplifierPRO ADC Stabilizer reads the position of the marker Gain Stabilization Enabled Zero Stabilization Enabled and inserts values into the fields ii j0 Center Chan o If the marker is in an ROI the Width f1 Width f1 limits of the ROI are used If the See eee Sasa esos marker is not in an ROI the center Akame Aane channel is the marker channel and Initialize 0 Initialize 0 the width is 3
94. to the internet or the Microsoft website to locate the driver choose the automatically locate driver option and follow the remaining prompts to completion When this operation is complete you are ready to run the MCB Configuration program so that MAESTRO and other CONNECTIONS software can recognize the DSPEC LF 2 2 4 Step 4 Run MCB Configuration to Communicate With Your MCBs IMPORTANT This is an abbreviated discussion of the operation and use of the MCB Configuration program We strongly recommend that you read the instructions for the CONNECTIONS Driver Update Kit for complete details on the command line arguments that change how the program searches for MCBs customizing MCB ID Numbers and Descriptions changing your Windows firewall settings to allow MCB access across a network enabling additional device drivers and troubleshooting 1 Make sure the DSPEC LF is connected and powered on 2 Connect and power on all other local and network ORTEC instruments that you wish to use as well as their associated PCs Otherwise the MCB Configuration program will not detect them during installation Any instruments not detected can be configured at a later time 3 To start the software type mcb in the Search programs and files box on the Windows Start menu then click the MCB Configuration search result or open the Windows Start menu and click MAESTRO then MCB Configuration The MCB Configuration program will locate all of t
95. values This command is used to quickly clear the list of MDA preset values CLEAR_PRESETS The live time true time ROI integral ROI peak and overflow presets are all set to zero disabled CLEAR_ROI The region of interest flags for the channels in the window of interest see SET_WINDOW command in the currently selected device see SET_DEVICE command are cleared CLOSE_FILE_FLASH crc No function in the DSPEC LF included for backward compatibility COMP No function in the DSPEC LF included for backward compatibility DISABLE_ BLRE_AUTOMATIC Disables the automatic determination of baseline restorer time constant See also ENABLE _ BLRE_AUTOMATIC SET_BLRE and SHOW_BLRE DISABLE_GAIN_STABILIZATION Stops stabilization of the gain peak while data is being acquired The gain stabilization adjustment is held at its current value until either gain stabilization is reenabled with the ENABLE _GAIN_STABILIZATION command or reinitialized with the INITIALIZE_ 42 931049D 0914 4 FIRMWARE COMMANDS AND RESPONSES GAIN_ STABILIZATION SET_GAIN_PEAK or SET_GAIN_WIDTH command See also SHOW_GAIN_STABILIZATION DISABLE_GATE_ROUTE No function in the DSPEC LF included for backward compatibility DISABLE_HV Turns off the high voltage enable signal of the DSPEC LF See the section on the bias supply for more information about the high voltage output See also ENABLE_HV and SHOW_HV DISABLE_HV_DIM Disables the use of the Detector connect
96. ware and Hardware Installation Installing the DSPEC LF and the MAESTRO MCA Emulation Software takes just four easy steps You must have Administrator access in Windows to install MAESTRO For easiest installation do not connect the DSPEC LF to your computer until MAESTRO has been installed 1 Install the accompanying CONNECTIONS Driver Update Kit P N 797230 selecting the USB based instruments family on the install wizard s Instrument Setup page 2 Install the accompanying MAESTRO MCA Emulation Software A65 BW 3 Connect the DSPEC LF to the USB port on the computer 4 Run the MCB Configuration program to build a list of available ORTEC MCBs DSPEC LF Digital Gamma Ray Spectrometer User s Manual 931049D 0914 2 2 1 Step 1 Install the CONNECTIONS Driver Update The first step is to install the CONNECTIONS Driver Update Kit P N 797230 according to its instruction sheet This software must be installed before MAESTRO can be installed The update kit s instructions tell how to install CONNECTIONS enable disable the drivers for your ORTEC MCB s and share ORTEC instruments across a network On the Instrument Families page be sure to mark the USB based instruments checkbox as shown in Fig 5 Otherwise the DSPEC LF will not be able to communicate with the computer and MAESTRO software At the end of installation you will be directed to restart the computer Instrument Setup 2
97. where Xxxxx is the start channel 0 16383 and yyyyy is the number of channels 1 16384 See SET_WINDOW for more information about the window of interest Example Responses D0000016384094 lt CR gt Window of interest reported as starting at channel 0 and continuing for 16384 channels D0000008192092 lt CR gt Window of interest reported as starting at channel 0 and continuing for 8192 channels D0819208192112 lt CR gt Window of interest reported as starting at channel 8192 and continuing for 8192 channels SHOW_ZERO_ ADJ Returns the value of the zero offset for the zero stabilizer SHOW_ZERO_CHANNEL Reports the center channel for the stabilizer zero peak See also SET_ZERO_CHANNEL SET_ZERO_WIDTH and SHOW_ZERO_WIDTH 70 931049D 0914 4 FIRMWARE COMMANDS AND RESPONSES Responses C00000087 lt CR gt Zero channel has not been set C00002089 lt CR gt Zero channel is channel 2 lowest possible channel C16382107 lt CR gt Zero channel is channel 16382 highest possible channel SHOW_ZERO_STABILIZATION Reports the state of zero peak stabilization See also ENABLE_ZERO_STABILIZATION and DISABLE_ZERO_STABILIZATION Responses IT lt CR gt Zero stabilization is currently enabled IF lt CR gt Zero stabilization is currently disabled SHOW_ZERO_WIDTH Reports the current width for the stabilizer zero peak See also SET_ZERO_WIDTH SET_ZERO_CHANNEL and SHOW_ZERO_CHANNEL Responses C00001088 lt CR gt Zero wid
98. will not turn on if the detector is sending a remote shutdown or overload signal The Overload indicator means there 22 931049D 0914 2 GETTING STARTED is a bad connection in your system The Shutdown indicator means that either the detector is warm or you have chosen the wrong Shutdown or Source mode To use a Sodium Iodide Detector mark the checkbox This changes the gain and zero stabili zers to operate in a faster mode For the DIM 296 the HV is controlled by the adjustment in the Model 296 and not here 2 3 6 About This tab Fig 16 displays hardware and firmware information about the currently selected DSPEC LF as well as the data Acquisition Start Time and Sample description In addition the Access field shows whether the Detector is currently locked with a password see the password discus sion in the MAESTRO user manual Read Write indicates that the Detector 1s unlocked Read Only means it is locked 2 3 7 Status Figure 17 shows the Status tab There are 21 values monitored at all times You can select any six of these to be displayed simultaneously on the Status tab The parameters you select can be changed at any time so you can view any of them as needed Two types of values are presented OK or ERR and numeric value The state of health SOH parameters read OK or ERR If the state is OK the para meter stayed within the set limits during the spectrum acquisition If the parameter varied fro

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