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DSPEC 50

®

and DSPEC 502

®

Digital Gamma-Ray Spectrometer User’s Manual

932502G / 0618

Figure 11. The Gauges Screen, Preset Reached and Acquisition Halted.

Figure 12. The Chart Screen With Gain Stabilizer Chart.

2.1.5.2. The Chart Screen

Figure 12 illustrates the Chart screen, which presents “virtual strip-charts” of the current input
count rate and % dead time. If the gain and/or zero stabilizers are enabled (Section 4.5), their
current % correction is also displayed. In addition; the

Now/Started/Finish

readouts are

shown at the bottom of the screen.

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Summary of Contents for DSPEC 50

Page 1: ...ORTEC DSPEC 50 50A DSPEC 502 502A Standard Advanced Digital Gamma Ray Spectrometer Hardware User s Manual Printed in U S A ORTEC Part No 932502 0618 Manual Revision G ...

Page 2: ...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 s...

Page 3: ...computer for any other purpose may void your warranty In addition the DSPEC 50 contains no user serviceable parts Breaking the seal on the case voids your warranty The DSPEC 50 should be opened only by ORTEC authorized service personnel If you have anyquestions about the use or maintenance of this instrument please contact your ORTEC representative or our Global Service Center first iii ...

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Page 5: ...cted Spectra Stored 11 1 6 3 CORR_ERR ZDT and Error Spectra Stored 11 1 6 4 Choosing a ZDT Mode 13 1 6 4 1 The NORM_CORR Diagnostic Mode 14 1 6 4 2 To Summarize 14 1 7 Host Computer and Software Requirements 14 1 8 About This Manual 15 2 THE DSPEC 50 17 2 1 Front Panel 17 2 1 1 The ON OFF Switch and Power Up 17 2 1 2 The Touchscreen Interface 17 2 1 3 The Display Control Screen Status Screen Setup...

Page 6: ... Ethernet Connection 34 3 4 2 USB Connection 35 3 5 Step 5 Run MCB Configuration to Establish Communication With Your MCBs 35 3 5 1 Configuring a New Instrument 36 3 5 2 Customizing ID Numbers and Descriptions 37 3 5 3 Connecting to and Disconnecting from the Computer 37 4 MCB PROPERTIES IN MAESTRO 39 4 1 Amplifier 39 4 1 1 Optimize 40 4 2 Amplifier 2 41 4 2 1 InSight Mode 42 4 2 1 1 Mark Types 44...

Page 7: ...1 4 Dollar Response Records 81 7 1 5 Command Catalog 81 APPENDIX A STATIC IP ADDRESSING 123 A 1 Preliminary Notes on IP Addresses and Subnet Masks 123 A 2 Assigning Static IP Addresses 123 APPENDIX B TROUBLESHOOTING 127 B 1 MAESTRO Does Not Connect with the DSPEC 50 127 B 2 Troubleshooting Static IP Addresses 128 B 3 Lost Password 128 APPENDIX C STATE OF HEALTH BIT DEFINITIONS 129 APPENDIX D CALCU...

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Page 9: ...instruction is not observed In addition the following symbols may appear on the product 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 th...

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Page 11: ...ample port programmable coincidence and gate settings counters for the Sample Ready and Gate input ports Web Services programming interface and a Web Page interface for hardware control and basic MCA emulation functions Features available only on the Advanced models are noted accordingly throughout this manual The DSPEC 50 is packed full of ORTEC s premier performance enhancing technology and user...

Page 12: ...e crystal volume The DSPEC 50 uses our Resolution Enhancer which enables you to correct for charge trapping by training the spectrometer to accommodate the particular performance of your detector See Section 1 3 Enhanced Throughput Mode This signal processing method allows the spectrometer to begin sampling the next pulse before the preceding one has returned to baseline The effect is optimum thro...

Page 13: ... own programs that can reconstruct histograms for any time segment without dead time between histograms or make histograms for overlapping time slices Data can be stored easily for reconstruction of any time frame needed In addition MAESTRO v7 supports our List Mode MCBs with menu and toolbar commands as well as commands in our automated JOB streams If your application requires real real time moni...

Page 14: ...d time for peak amplitude there will be a deficit in the measured peak amplitude and a broadening of the pulse width 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 ...

Page 15: ...ma ray from 60 Co would be about 1 5 keV FWHM Real detectors typi cally have a resolution of 1 8 to 2 2 keV FWHM ORTEC s Charge Trapping Corrector CTC helps reduce this energy resolution loss caused by charge trapping yielding the DSPEC 50 s Resolution Enhancer Mode The controls are accessed via the Acquire MCB Properties com mand in the accompanying MAESTRO Multichannel Analyzer Emulation Softwar...

Page 16: ...se has returned to the baseline provided the first pulse has returned to baseline when the peak detect of the second pulse occurs The ORTEC Enhanced Throughput Mode takes advantage of this feature of digital signal pro cessing by allowing you to adjust the delay between the peak detect and the start of processing of the next pulse The dead time for a conventionally processed pulse is the sum of th...

Page 17: ...he step pulse are averaged and then subtracted from the average of N samples taken after the step pulse This simple procedure produces a trapezoidal weighting function with a rise time of N sample intervals and a flattop of M sample intervals The maximum value of the trapezoid output occurring at the end of the flattop is the best esti mate of the step height and therefore the gamma ray energy Wit...

Page 18: ...the trapezoidal filter itself to measure the slope both before and after the energy measurement Since the digital filter is always sampling the input signal it is only necessary to store 1 the values measured before the event is detected 2 the gamma ray energy measurement and 3 the values measured after the event is detected The modified trapezoidal digital filter for LFR from an InSight Virtual O...

Page 19: ... ZDT Mode An extended live time clock increases the collection time real time of the acquisition to correct for input pulse train losses incurred during acquisition due to system dead time This corrected time value known as the live time is then used to determine the net peak count rates necessary to determine nuclide activities As an example consider the case where the spectrometry amplifier and ...

Page 20: ...taking very short acquisitions and applying a correction in real time that is as the data are coming in to the number of counts in the spectrum This technique allows the gamma ray flux to change while the acquisition is in progress yet the total counts recorded in each of the peaks are correct The resulting spectrum has no dead time at all in ZDT mode the data are correc ted not the acquisition ti...

Page 21: ...ime losses real time only Unfortunately in the analysis of the ZDT spectrum the uncertainty of the measurement cannot be determined using either spectrum NOTE This mode is not useful for quantitative analysis if the counting rate varies significantly during the measurement time particularly if the user desires an accurate counting rate and standard deviation calculation When you select the NORM_CO...

Page 22: ...ed as where B1 sum of background counts for the channels adjacent to the peak start low energy channel L B2 sum of background counts for the channels adjacent to the peak end high energy channel H n1 the number of low background points n1 1 3 or 5 used n2 the number of high background points n2 1 3 or 5 used The peak area uncertainty is calculated from where G is the sum of counts from the error s...

Page 23: ...Consequently the average activity of the short lived isotope will be under estimated If you anticipate significantly varying counting rates during the time taken to acquire the spectrum the CORR_ERR ZDT mode should be used The CORR_ERR mode corrects for dead time losses over minuscule time intervals by adding counts to the ZDT spectrum in propor tion to the instantaneous ratio of real time to live...

Page 24: ...ion 1 6 4 2 To Summarize Use the ZDT Off mode when the counting rate is expected to be constant during the time taken to acquire the spectrum Use the ZDT CORR_ERR mode when the counting rate is expected to change or might change significantly during the time required to acquire the spectrum Avoid using the NORM_CORR mode because ISOTOPIC v4 will default to analyzing the LTC spectrum and will ignor...

Page 25: ... and responses Features associated only with the Advanced models DSPEC 50A and DSPEC 502A are identified in the respective sections of this manual Complete details on using the control software are in the accompanying MAESTRO Software User s Manual as well as the manuals for GammaVision ISOTOPIC and our other integrated MCA emulator analysis software NOTE Except as noted when we refer to MAESTRO i...

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Page 27: ...ts the DSPEC 50 software application at the Switchboard screen discussed below This typically takes 20 30 seconds 2 1 2 The Touchscreen Interface The touchscreen interface includes The Switchboard screen from which you can open two control screens and four data display screens The DSPEC 502 Switchboard displays two banks of four data display screens one per MCA this is shown in Fig 6 To view a con...

Page 28: ...his screen and the Display Control screen and assign static IP addresses to multiple DSPEC 50s where required typically not necessary see Section 2 1 4 Display Control Status Setup This screen controls the display display order and display interval of the touchscreen graphics see Section 2 1 3 Four data display screens per MCA i e two banks of four for the DSPEC 502 that provide real time system a...

Page 29: ...screen s display order tap it then tap the Up and Down buttons as needed to reposi tion it Tap Scroll to move up and down through the list of screens Tap Time and Time to change the screen display interval The DSPEC 502 has two sets of the four data display screens identified here with a suffix of MCA 1 or MCA 2 Tap Apply to accept any changes and return to the Switchboard Tap Cancel to return to ...

Page 30: ...IP address to an Ethernet connected unit Tap the yellow wrench thumbnail to access it Fig 8 If a password is in effect a password screen with soft keyboard will open tap the password and OK The upper left Host name is factory assigned The MAC address is unique to the Ethernet adapter and can be used to trouble shoot network connection issues The Advanced models will also display the Web Page addre...

Page 31: ... user manual To set the password Tap the Set Password button to open the soft keyboard shown in Fig 9 Passwords can be any length and any combination of uppercase and lowercase letters and numbers Enter and reenter the new password Tap OK to accept the new password or Cancel to exit the screen with no change The password goes into effect immediately When you try to access either of the setup scree...

Page 32: ...quisition parameters in real time All four display the following The current time Now the start time for the current or most recent acquisition Started and at the end of acquisition the stop time of the most recent acquisition Finish A red HV Off indicator when the bias is off A bright background when data acquisition is in progress and a neutral background when acquisition is stopped In addition ...

Page 33: ...set was reached Figures 10 and 11 respectively illustrate the Gauges screen during and after a data acquisition Note that the of preset gauge in Fig 10 shows that about 33 of the preset has elapsed Also the Dead time gauge and readout as well as the bright screen background reflect that a count is in progress By contrast in Fig 11 the 100 reading on the of preset gauge indi cates the preset condit...

Page 34: ... Screen With Gain Stabilizer Chart 2 1 5 2 The Chart Screen Figure 12 illustrates the Chart screen which presents virtual strip charts of the current input count rate and dead time If the gain and or zero stabilizers are enabled Section 4 5 their current correction is also displayed In addition the Now Started Finish readouts are shown at the bottom of the screen 24 ...

Page 35: ...rked with a yellow background and an activity readout for each is displayed below the histogram See the two yellow ROIs in Fig 13 Figure 14 shows the Nuclide Report setup tab for these two ROIs If standard ROIs have been defined in an ORTEC spectroscopy application using the com mands on the ROI menu they are indicated with an orange background on the DSPEC 50 spectrum screen See the three orange ...

Page 36: ...DSPEC 50 and DSPEC 502 Digital Gamma Ray Spectrometer User s Manual 932502G 0618 Figure 14 Two Nuclide Report ROIs Defined Figure 15 The Spectrum in GammaVision showing standard ROIs 26 ...

Page 37: ...lot and RESET port Otherwise each MCA has the following set of inputs and outputs On the DSPEC 502 some connector labels are abbreviated due to space constraints the abbreviations are given in parentheses below See Section 6 1 1 for more detail on the inputs and outputs DIM Multi pin 13W3 connector supports the SMART 1 and other ORTEC DIM detectors No other rear panel detector connections are requ...

Page 38: ...ear panel BNC accepts preamplifier output signals of either polarity PREAMP POWER Rear panel 9 pin D connector provides 24 V and 12 V for preamplifier power GATE IN GATE Accepts slow positive NIM input Software selectable as off coincidence or anticoincidence INHIBIT IN INHIBIT Rear panel BNC connector accepts reset signals from TRP or POF preamplifiers 28 ...

Page 39: ...connection Link and Activity LEDs are integrated into the connector USB Emulates a USB connection Any number of DSPEC 50s can be connected to a host computer via USB SD SecureDigital SD memory card slot for uploading a maximum of 9 optional JPG format image files See page 19 RESET Maintenance port AC MAINS POWER MODULE 100 240 V ac 47 63 Hz 110 watts The unit is shipped with the voltage setting fu...

Page 40: ... 0 25 inch Fig 20 4 The door can now be opened from the right exposing the fuse holder and voltage selector card Fig 21 2 2 1 1 Replacing the Fuse s 1 With the unit disconnected from ac power lift out the reversible fuse holder Fig 22 2 This instrument requires the following 250 V fuses For 100 or 120 V ac line voltage one fuse 2 A SB size 3AG For 230 or 240 V ac line voltage two fuses 1 A T size ...

Page 41: ...e voltage the single AG fuse should face down and for 230 or 240 V ac line voltage the twin metric fuses should face down Gently press down until the fuse holder is fully seated Close the module door as described in Section 2 2 1 3 2 2 1 2 Changing the Line Voltage 1 Use the indicator pin to pull the voltage selector card straight out of the module If necessary lift the indicator pin a few millime...

Page 42: ...module 4 Reinsert the card into the module printed side of the card facing left toward the IEC power connector with the edge listing the desired voltage first down Gently but firmly press the card into the module until it is fully seated 5 Close the module door as described in Section 2 2 1 3 2 2 1 3 Closing the Input Power Module 1 When you have completed changes to the line voltage and or fusing...

Page 43: ...sed on your location However before you use the unit we strongly recommend that you confirm it is pro perly set up for your region s ac mains supply For instructions on changing the line voltage and fusing see Section 2 2 1 3 2 Step 2 Install the CONNECTIONS Driver Update Next install the accompanying CONNECTIONS Driver Update Kit P N 797230 according to its instruction sheet This product must be ...

Page 44: ...DSPEC 50 to your net work with a standard Cat 5 RJ45 Ethernet cable power the DSPEC 50 on wait 10 15 seconds for the network s DHCP server to assign a dynamic IP address to the DSPEC 50 and you re ready to run the MCB Configuration program Section 3 5 In addition to these networked DSPEC 50s you can attach DSPEC 50s directly to your computer either by Ethernet or by USB connection as described in ...

Page 45: ...TANT 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 ne...

Page 46: ...g 29 will remind you that all new instruments must be assigned a unique non zero ID number 11 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 NOTE We strongly recommend not using the Renumber All button In addition we strongly recommend not renumbering MCBs that b...

Page 47: ... Disconnecting from the Computer The DSPEC 50 can be connected to and disconnected from the computer without shutting down either If you disconnect from the computer during data acquisition leaving the DSPEC 50 under power so that the high voltage stays on the DSPEC 50 will continue data NOTE FOR MULTIPLE USERS ON A NETWORK There are two ways to reduce the chance that other users will renumber you...

Page 48: ...gital Gamma Ray Spectrometer User s Manual 932502G 0618 collection To redisplay the spectrum simply reconnect the DSPEC 50 via the same method Ethernet or USB then close and reopen the MAESTRO spectrum window for that input 38 ...

Page 49: ...move from tab to tab and set your hardware parameters then click Close 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 elapsed without further input While the entry is underlined no other program or computer on the network can modify this value 4 1 Amplifier The Amplifier tab is shown in figures 31...

Page 50: ...in the DSPEC 50 even when the power is off The time constant can be manually set on the InSight display see the discussion beginning on page 42 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 44 In the automatic mode the current value is shown on the InSight sidebar Fig 34 For a low count rate system the value will re...

Page 51: ... several rise time values and the DSPEC 50 is cycled through all the rise time values for the determination of the optimum tilt values All values for all the combinations are then saved in the DSPEC 50 so you do not need to optimize for each possible rise time Optimization can take from 1 to 10 minutes depending on count rate but typically takes 5 minutes NOTE Be sure to repeat the optimization if...

Page 52: ...he 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 In the Pole Zero section the Start button performs a pole zero at the specified rise ...

Page 53: ... InSight mode The Status Sidebar changes from the PHA mode controls to the InSight controls for adjusting the peak display Fig 34 On the left is a vertical scrollbar for adjusting the vertical offset of the waveform 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...

Page 54: ...e display when it is expanded The display can be switched from the DSPEC 50 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 50 If you exit the program with the DSPEC 50 in InSight mode it will be in InSight mode on th...

Page 55: ...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 all 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 ìs after the pulse maximum on the display On t...

Page 56: ...sed below Note that once an MCB is trained for the Resolution Enhancer see the following section it must be retrained if any settings are changed that can affect peak shape or position e g bias gain rise time flattop pole zero Low Frequency Rejector This feature is discussed in detail in Section 1 5 You cannot optimize or pole zero the DSPEC 50 while in LFR mode The Optimize feature must be used w...

Page 57: ...ou can adjust this value at any time Each time you change the rise time or flattop the DSPEC 50 will automatically set itself to the new minimum protection time Inhibit Width Advanced Models Only Sets a minimum inhibit signal time from 0 to 200 us in increments of 0 025 us If the inhibit signal is still high after this time period has elapsed then the inhibit signal remains high until the input si...

Page 58: ...er might require one or more data acquisitions When finished proceed to Step 4 4 Clear the MCB and acquire a well isolated peak 5 Mark the Resolution Enhancer checkbox to turn on the learning mode 6 You will now use the gain stabilization section of the Stabilizer tab to configure the Resolution Enhancer the gain stabilizer is disabled in the learning mode Enter the Center channel and Width of the...

Page 59: ... again operates on the gain stabilizer that is it no longer adds values to the table of adjustments NOTE The peak selected for the gain stabilizer can be different from the peak used for training the Resolution Enhancer 13 To turn off the Resolution Enhancer mark its checkbox to turn on the learning mode go to the Stabilizer tab and click the Initialize button for the gain stabilizer This will set...

Page 60: ...pplied The peak detect time can be determined from the Rise Time and Flat Top settings for peak detection Note that the Gate cannot start until after the coincidence has been determined so the coincidence delay and window should be accounted for when setting the Gate Delay For example if the coincidence delay is negative 4 uS and the combination of Rise Time and Flat Top is 12 uS then the Gate Del...

Page 61: ...level establishes an upper level cutoff by channel number for storage 4 5 Stabilizer The DSPEC 50 has both a gain stabilizer and a zero stabilizer see Section D 2 The Stabilizer tab Fig 40 shows the current values for the stabilizers 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...

Page 62: ... SMART 1 or DIM module The Source is Internal for con ventional non DIM detectors DIM 296 for the Model 296 and DIM SMART for all other DIM based detectors NOTE NaI detectors require the DIM POSNAI interface and the DIM SMART source selection The shutdown types are ORTEC TTL and SMART The ORTEC mode is used for all ORTEC detectors except SMART 1 SMART detectors For non ORTEC detectors check with t...

Page 63: ...DSPEC 50 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 pass word see the password discus sion in the MAESTRO User s Manual Read Write indicates that the Detector is unlocked Read Only means it is locked 4 8 Status Figures 43 and 44 shows the Status tab for the Standard and Advanced models respect...

Page 64: ...ns OK or an error message describing a problem with detector power or bias Counter A Sample Ready Advanced Models Only Displays the current input counter value for the Sample Ready port This counter is cleared and started with spectrum acquisition Counter B Gate Advanced Models Only Displays the current input counter value for the Gate port This counter is cleared and started with spectrum acquisi...

Page 65: ...e ROI Peak preset can be viewed as a safety valve 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 Presets tab the changes take place only when you Close the Properties dialog Enter the Real Time and Live Time presets in units of seconds and fractions of a second These values are stored internally w...

Page 66: ...d after the preset is entered without affecting the uncertainty calculation If the marker is not in positioned in an ROI for calibrated spectra the start channel is 1 5 times the FWHM below the marker channel and the width is 3 times the FWHM for uncalibrated spectra the region is centered on the peak located within two channels of the marker and as wide as the peak The net peak area and statistic...

Page 67: ...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 Corre ction 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 click to highlight it in the table This will load its Nuclide Energy and coef ficients in the lower sections of...

Page 68: ...alculated value is computed by multiplying the net peak count rate by a user defined constant If the constant includes the efficiency and branching ratio the displayed value is the activity You enter the nuclide label and the activity units The report format and calculations are discussed in Appendix D IMPORTANT The entries you make on this screen are saved in the MCB memory and are not dynamicall...

Page 69: ...uclide Make any changes needed Any or all of the entries can be changed When finished with the changes click Update 4 11 3 Delete To remove an entry select the entry and click Delete When you close the Properties dialog all the values entered are written to the DSPEC 50 and the two lowest energy ROIs and corresponding activity readouts are displayed on the DSPEC 50 screen 4 12 Output Tab The Outpu...

Page 70: ...the pulses being processed by the digital filter to the minimum value for the resolution needed 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 is about twice that indicated by the conven tional time constants displayed on the front panel of commercial analog amplifiers For example germanium detectors are often specified...

Page 71: ...ile achieving the best resolution obtainable from the detector 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 ìs even though some digital instruments can be set for rise times as long as 23 ìs I...

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Page 73: ...s Operating Systems are desired in the user environment Access to these features requires an ethernet connection and a valid IP configuration to access the instrument on the network 5 1 Web Page The main Web Page interface shown in Fig 50 is accessed by entering the Remote Web URL which is displayed on the front panel Communication Control screen as described in Section 2 1 4 An internet connectio...

Page 74: ...ese pages to the MCA currently selected on the Main page Note that the information displayed on these pages are updated when the page is accessed and static thereafter The pages must be refreshed periodically when monitoring parameters that are changing For example to observe the High Voltage ramping up after applying the target voltage the page should be refreshed until the Actual High Voltage st...

Page 75: ... described for the Web Page 0 Normal View 1 Alt1 2 Alt2 The content for each depends on ZDT or Gate Route Mode acquisition iStartChan is the starting channel iNumChan is the number of channels to load starting from the start channel The spectrum data is returned as a string where each 32 bit channel counts is represented by eight hex characters When in PHA data acquisition mode the counts in each ...

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Page 77: ... Amplifier Input Polarity Software selectable System Conversion Gain Software selectable as 16384 8192 4096 2048 1024 or 512 channels Advanced models also include 256 32768 and 65536 settings Digital Filter Shaping Time Constants Rise time 0 8 ìs to 23 ìs in steps of 0 2 ìs Flattop 0 3 to 2 4 in steps of 0 1 ìs Corrections Dead Time Correction Extended live time correction according to Gedcke Hale...

Page 78: ...nt that would normally be histogrammed as a spectrum is sent to the computer in the form of a pulse height value along with a time stamp that indicates the time the pulse arrived The data can be analyzed by the computer in real time to determine if some significant event has occurred or can be streamed to disk for analysis at a later time See Appendix E Linearity Integral Nonlinearity 0 025 over t...

Page 79: ...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 Real Time Stops data collection when the real time reaches this value Live Time Stops data collection when the live time reaches this value ROI Integral Integral count stops data collection when the sum of counts in all ROI ch...

Page 80: ...low positive NIM input software selectable as off coincidence or anticoincidence ADC GATE signal must precede and overlap the flat top region by 0 5 ìs and extend beyond the flat top region by 0 5 ìs InSight Oscillo scope allows easy alignment of the ADC GATE signal with the digital output pulse The Advanced models have configurable coincidence and gate timing options to align the gate to the peak...

Page 81: ...nal is configurable with the Advanced models as described in Section 4 12 SAMPLE READY IN Rear panel BNC connector accepts TTL level signal from sample changer The Advanced models have a counter associated with TTL pulses on the Sample Ready port ETHERNET Standard 10 100 Mbit Ethernet connection Link and Activity LEDs are inte grated into the connector Use dynamic or static IP addressing USB Emula...

Page 82: ...e gain 2 Software selectable fine gain 3 Gain stabilizer 4 Zero stabilizer 5 PHA mode functions available 6 MCS mode functions available 7 List mode functions available 8 Sample mode functions available 9 Digital Offset e g 920 10 Software selectable analog offset 11 HV power supply 12 Enhanced HV SET_HV SET SHOW_HV_POL SHOW_HV_ACT 13 Software selectable HV range ENA_NAI DIS_NAI 14 Auto PZ START_P...

Page 83: ... upper and lower thresholds 43 Software selectable MCS mode input sources 44 Uncertainty statistical preset SET_UNCERT_PRES 45 Features vary by input SHOW_FEATURES depends on device segment multi input MCBs only 46 Software selectable HV shutdown mode SET SHOW VERI_SHUT 47 Software selectable shaping time constants SET_SHAP 48 Explorable shaping time constants SHOW_CONFIG_SHAP 49 Advanced shaping ...

Page 84: ...es SET SHOW LIST_MODE_ZDT 76 Has multi nuclide MDA preset 77 Has MCS Replace then Sum Mode SET_RPLSUM 78 Has programmable external dwell voltage capability 79 No Peak Preset feature M3 CA and OASIS 80 Programmable pulser OASIS 81 Programmable Vacuum HV interlock OASIS 82 Programmable Current HV interlock OASIS 0 83 Explorable Stabilizer LIST_GAIN_ADJU LIST_ZERO_ADJU 84 Has programmable input imped...

Page 85: ...ynch List Mode is available 111 DSPEC PRO auxiliary BNC input available 112 SET_DISPLAY is NOT used to select ZDT data view 113 ID Reports DO_ID SHOW_REPORT SHOW_REPO_LINES 114 Has neutron detector SHOW_CRM 2 returns valid number 115 List Mode data streamed and formatted like DIGIBaseE 116 Has the ORTEC new Alpha Instrument feature set 117 Selectable HV source 118 Has noise rejection circuits in t...

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Page 87: ...scussed in Section 7 1 2 SHOW and STEP commands respond with a dollar response record Section 7 1 4 7 1 1 Command Records Commands consist of a command header that may be followed by numeric parameter values The header consists of a verb or a verb and noun separated by an underscore or a verb noun and modifier each separated by underscores The first four letters of a word in a command will always ...

Page 88: ...ple the SET_WINDOW command must include the two optional parameters start and length if the checksum is provided e g SET_WINDOW 0 16384 209 7 1 2 USB Interface Error Codes On each completion of the command the MCB returns a macro error code and micro error code The macro error code represents the general class of error with 0 meaning no error and the micro error code represents the sub class of er...

Page 89: ... code bbb represents the micro error code ccc represents the checksum and CR represents the ASCII carriage return character signifying the end of the record The macro error code represents the general class of error with 0 meaning no error and the micro error code represents the sub class of error with 0 meaning no error Following is a list of all percent responses for the DSPEC 50 Unconditional S...

Page 90: ... power up selftest passed 003000072 CR Battery backed up data lost Command Syntax Errors 129001082 CR Invalid command verb 129002083 CR Invalid command noun 129003084 CR Invalid command verb and noun 129004085 CR Invalid command modifier 129005086 CR Invalid command verb and modifier 129006087 CR Invalid command noun and modifier 129007088 CR Invalid command verb noun and modifier 129132087 CR Inv...

Page 91: ...ON command Mxxxxxxxxxx ccc CR Response to SHOW_STATUS command Nxxxyyyzzzccc CR xxx yyy and zzz are 8 bit unsigned numbers 7 1 5 Command Catalog This section lists each command with a description of its operation The descriptions include a list of any unusual responses that may result The no errors response from a command is a 000000069 CR Ethernet interface or a macro error code of 0 and a micro e...

Page 92: ...ion was in progress No action was taken CLEAR_COUNTER 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_LIST Clears data and resets acquisition in List Mode The response is the same as the CLEAR command CLEAR_MDA_PRESET Clears ...

Page 93: ... 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_GAIN_ STABILIZATION SET_GAIN_PEAK or SET_GAIN_WIDTH command See also SHOW_GAIN_STABILIZATION DISABLE_HV Turns off the high voltage enable signal of the DSPEC 50 See ...

Page 94: ...led See ENABLE_RENH DISABLE_THRESHOLD_FMAN Disables manual adjustment of the fast channel threshold DISABLE_THRESHOLD_AUTOMATIC DISABLE_THRESHOLD_SAMPLE DISABLE_TRIGGER_SPECIAL No function in the DSPEC 50 included for backward compatibility DISABLE_TRIGGER Disables the data acquisition trigger that was enabled by the ENABLE_TRIGGER command Cancels an ENABLE_TRIGGER_REP if it is issued before the a...

Page 95: ...e also DISABLE_GAIN_ STABILIZATION SHOW_GAIN_STABILIZATION and INITIALIZE_GAIN_STABILIZATION ENABLE_HV Turns on the high voltage enable output of the DSPEC 50 See also DISABLE_HV and SHOW_HV Non USB Execution Errors 131137085 CR The high voltage could not be enabled due to a high voltage shutdown condition ENABLE_HV_DIM Enables the DSPEC 50 to work with a standard DIM e g DIM POSNAI DIM POSGE or D...

Page 96: ...ABLE_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_THRESHOLD_FMAN Enables manual adjustment of the fast channel threshold ENABLE_THRESHOLD_SAMPLE ENABLE_TRIGGER_SPECIAL No function in the DSPEC 50 included for backward compatibility ENABLE_TRIGG...

Page 97: ...ITIALIZE_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_AD...

Page 98: ... 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_INHIBIT_WIDTH Lists the valid inhibit width settings Response INHI_WIDT 0 200 0 8000 0 to 200 u...

Page 99: ...r 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 ìs LIST_SHAPE_RISE Lists the valid rise time settings Response SHAP_RISE 0 8 23 0 4 115 Settings are 0 8 to 23 in 0 2 ìs steps LIST_SHUT Lists the valid shutdown settings Response SHUTDOWN TTL ORTEC SMART LIST_TIME_ETP Returns the range of valid ...

Page 100: ...he specified value ROI flags are not affected SET_DATA_APPLICATION string1 string2 This is used to store information in the DSPEC 50 internal memory that can be used by other programs such as sample descriptions and energy calibrations The Unified MCB Interface UMCBI structure and ORTEC CONNECTIONS make use of this feature String1 the data identifier 32 bytes maximum string2 the data 128 bytes max...

Page 101: ...nly by the gain stabilizer and reset to 0 with the INITIALIZE_ GAIN_STABILIZATION command See also SHOW_GAIN_ADJUSTMENT Non USB Execution Errors 131134082 CR The command was attempted when the currently selected device was other than device 1 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 woul...

Page 102: ...oint value from 0 5 to 1 1 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 50 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 cha...

Page 103: ...ing analyzed See also SHOW_ID Non USB Execution Errors 131132080 CR No ID string was specified No action was taken Example SET_ID Site 123 SET_INHIBIT_WIDTH XX XXX Sets the width value in microseconds for the Inhibit input Legal values are 0 to 200 us with a step size of 0 025 uS e g SET_INHIBIT_WIDTH 4 025 This width extends the Inhibit signal to be high at least as long as the specified value If...

Page 104: ...data acquisition See also CLEAR_COUNTER and SHOW_LIVE Non USB Execution Errors 131135083 CR The command was attempted while spectrum acquisition was in progress No action was taken SET_LIVE_PRESET ticks Sets the live time preset to the specified number of ticks 20 ms tick During data acquisi tion when the live time counter reaches the preset number of ticks the preset is complete and the acquisiti...

Page 105: ...ity software that only supports the one nuclide MDA method implemented in some MCBs SET_MODE_LIST Sets the DSPEC 50 to list mode See also SHOW_MODE SET_MODE_PHA Sets the mode to PHA SET_MODE_SAMPLE Starts the InSight Virtual Oscilloscope mode SET_MODE_ZDT mode Sets the ZDT mode LIST_MODE_ZDT can be used to determine which modes are valid Mode 0 standard indicates that a normal and corrected spectr...

Page 106: ...preset value by a small number of counts due to the pipelined architecture of the DSPEC 50 Setting a peak preset to 0 counts disables the preset The peak preset may be set to from 0 disabled to 2147483647 counts See also CLEAR_PRESETS and SHOW_PEAK_PRESET Non USB Execution Errors 131135083 CR The command was attempted while spectrum acquisition was in progress No action was taken SET_PZ num This s...

Page 107: ...put pulse width in microseconds If active is zero then the SCA pulse is only generated when acquisition is in progress If active is one then the SCA pulse is active regardless of acquisition status Use SET_OUTPUT_SEL 2 to route the SCA signal to the Change Sample Port or manually set the output option using MCB Properties pages SET_SEGMENT No function in the DSPEC 50 included for backward compatib...

Page 108: ...hreshold to value The negative threshold is normally set automatically by the DSPEC 50 See also ENABLE_ THRESHOLD_AUTOMATIC and SHOW_ THRESHOLD_NEGATIVE SET_THRESHOLD_POSITIVE value Sets the positive threshold to value The positive threshold is normally set automatically by the DSPEC 50 See also ENABLE_THRESHOLD_AUTOMATIC and SHOW_ THRESHOLD_POSITIVE SET_TIME hour min sec Sets the time stored in t...

Page 109: ..._TRIGGER and SHOW_TRIGGER_POLARITY SET_TRIGGER_SAMPLE setting Selects the triggering source in Insight Mode See LIST_TRIGGER_SAMP for legal trigger sources 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 50 during data acquisition See also CLEAR_COUNTER and SHOW_TRUE No...

Page 110: ...5535 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 c...

Page 111: ...AUTOMATIC Shows whether automatic selection of the baseline restorer constant is off or on Responses IT CR Automatic baseline is enabled IF CR Automatic baseline is disabled 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 50 and the current conversion gain f...

Page 112: ... CR The specified string could not be matched 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 C...

Page 113: ...E 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 if a DIM is connected Examples FNAID000 NaI DIM firmware version FSMDT000 SMART 1 firmware version SHOW_DEVICE Shows the currently selected devic...

Page 114: ...90633872 02153857247 Advanced Models FEATURES 02268854591 01099845644 00790633872 04267786463 SHOW_FEATURES_EXT This command is an extension of the SHOW_FEATURES command and returns four 32 bit masks indicating which features are present in the MCB starting with Bit 128 Example Responses Standard Models FEATURESEX 00000000000 00000000000 00000000000 00000000000 Advanced Models FEATURESEX 000000000...

Page 115: ...n gain Responses C00512095 CR Conversion gain reported as 512 channels C01024094 CR Conversion gain reported as 1024 channels C02048101 CR Conversion gain reported as 2048 channels C04096106 CR Conversion gain reported as 4096 channels C08192107 CR Conversion gain reported as 8192 channels C16384109 CR Conversion gain reported as 16384 channels SHOW_GAIN_FINE Returns the current fine gain setting ...

Page 116: ... and the status of the high voltage power supply in the form Dvvvvvsssssccc 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 negati...

Page 117: ... 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 Example Responses D0200000003077 CR 2000 V negative not overloaded disabled D0200000002076 CR 2000 V positive not overloaded disabled D0200000007082 CR 2000 V negative not overloaded enabled SHOW_ID Reports the sample ID string as was previously set by the SET_ID com...

Page 118: ...ROI integral preset see SET_INTEGRAL_PRESET See also SHOW_INTEGRAL Responses G0000000000075 CR Integral preset reported as 0 G4294967295132 CR 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 CR Integral remaining r...

Page 119: ...ING Reports the current live time remaining in units of 20 ms 50 ticks s See also SET_LIVE_REMAINING Responses G0000000000075 CR Live time remaining reported as disabled G0000000001076 CR Live time remaining reported as 1 tick G4294967295132 CR 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 SH...

Page 120: ...T_MODE_ZDT Responses MODE_ZDT 00000 Mode 0 selected normal and corrected MODE_ZDT 00001 Mode 1 selected error and corrected SHOW_MONI_LABEL num Returns with an ASCII string label designation for the SOH parameter for num SHOW_MONI_MAX Returns with the number of SOH values available for viewing SHOW_MONI_VALUE num Returns with an ASCII representation of the value for the SOH parameter SHOW_NAI Indi...

Page 121: ...el last set by a SET_OUTPUT_HIGH or SET_OUTPUT_LOW command Responses C00000087 CR Change Sample output currently low C00001088 CR Change Sample output currently high SHOW_OUTPUT_WIDTH Returns the status of the output pulse generated initiated by SET_OUTPUT_WIDTH Responses IT CR Pulse in progress IF CR Pulse finished SHOW_PEAK This command returns the contents of the ROI channel with the largest nu...

Page 122: ...e value of the ROI peak preset See SET_PEAK_PRESET for information about the ROI peak preset Responses G0000000000075 CR Peak preset disabled G0000000001076 CR Peak preset set to 1 count G2147483646120 CR Peak preset set to 2147483646 counts G2147483647121 CR Peak preset set to 2147483647 counts SHOW_PUR Returns the status of the Pile Up Rejection Circuitry Responses IT CR PURenabled IF CR PUR dis...

Page 123: ... that all have their ROI bit set Responses D0100000050078 CR First ROI starts at channel 1000 and is 50 channels long D0215000150086 CR First ROI starts at channel 2150 and is 150 channels long D0000000000072 CR 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 channel...

Page 124: ...T_SHAP_RISE Responses SHAP_RISE 0000000000003 2 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...

Page 125: ... 6 7 Unused Bit 8 Amplifier automatic PZ 1 Auto PZ in progress 0 normal Bit 9 Optimization 0 normal 1 in progress Bits 10 14 Unused Bit 15 MSB Reserved SHOW_THRESHOLD_AUTOMATIC See also SET_THRESHOLD_AUTOMATIC Responses IT CR Automatic threshold is enabled IF CR Automatic threshold is disabled SHOW_THRESHOLD_FAST Returns the current fast channel threshold in the form FMAN_ENA xxxxx or FMAN_DISA xx...

Page 126: ...n the form Nhhhmmmsssccc CR 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 CR Time returned 10 54 17 10 h 54 min 17 s N020013037050 CR Time returned 20 13 37 20 h 13 min 37 s SHOW_TRIGGER T...

Page 127: ...icks 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 CR True time preset reported as disabled G0000000001076 CR True time preset reported as 1 tick G4294967295132 CR True time preset reported as 4294967295 ticks SHOW_TRUE_REMAINING Reports the current true time remaining in units ...

Page 128: ...ple Responses FDS50 003 CR Model DSPEC 50 firmware version 3 reported SHOW_WINDOW Reports the start channel and number of channels in the window of interest in the form Dxxxxxyyyyyccc CR 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 CR Window of interest reported...

Page 129: ...en set C00003089 CR Zero width is 3 channels lowest possible width C00256100 CR Zero width is 256 channels highest possible width in Gauss mode C16383108 CR 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 may be any value...

Page 130: ...nd was received The duration of the intermediate level varies but is never less than 2 ìs Use the SET_OUTPUT_HIGH or SET_OUTPUT_LOW commands to establish an initial output level Responses C00000087 CR Initial and final level on Change Sample was low C00001088 CR Initial and final level on Change Sample was high STOP seg mask Stops the acquisition of spectral data The optional segment mask is provi...

Page 131: ...932502G 0618 7 FIRMWARE COMMANDS AND RESPONSES VERIFY_CORR_FLAT VERIFY_SHAP_FLAT VERIFY_SHAP_RISE These test the argument against the list of valid settings and return true if valid 121 ...

Page 132: ...DSPEC 50 and DSPEC 502 Digital Gamma Ray Spectrometer User s Manual 932502G 0618 Intentionally blank 122 ...

Page 133: ...IP Address Subnet Mask Computer 10 7 3 3 255 255 0 0 Printer 10 8 3 3 255 255 0 0 DSPEC 50 10 7 3 4 255 255 0 0 All IP addresses on the list are unique this is the minimum requirement for successful communi cation However we must also examine the subnet mask setting In the subnet mask 255 255 0 0 the first two bytes sections have all the bits set This means that in order for two devices to communi...

Page 134: ...RTANT Do not enter leading zeroes in any of the four sections e g enter 10 not 010 Also be sure to insert the decimal point demarcator between sections Tap OK to accept the completed IP address then tap Apply to close the Communication Center dialog As noted above the same Subnet Mask must be assigned to the computer and all DSPEC 50s that will communicate with it If the DSPEC 50 s subnet mask doe...

Page 135: ...ernet connection PING the IP address assigned to the DSPEC 50 and verify that no other device responds to the PING If a device does respond choose a new address for the DSPEC 50 and try again See also Sections A 1 and B 2 or consult your IT department 5 Each subsequent DSPEC 50 must have a unique valid IP address and its subnet mask must match the computer s When all have been set up and connected...

Page 136: ...DSPEC 50 and DSPEC 502 Digital Gamma Ray Spectrometer User s Manual 932502G 0618 Intentionally blank 126 ...

Page 137: ...ress See Section B 2 For networked DSPEC 50s with static IP addresses each must have a valid IP address See Section B 2 and keep in mind that no two adapters in the system can have the same signifi cant bits in their IP address Usually this means if the subnet has 255 in one of its groups that group is significant The actual calculation is to do a bitwise AND operation between the IP address and t...

Page 138: ...occurring unplug the DSPEC 50 Ethernet connection PING the IP address which has been assigned to the DSPEC 50 and verify that no other device responds to the PING If a device does respond choose a new address for the DSPEC 50 and try again PING the new IP address to confirm it is correctly configured B 3 Lost Password If you lose the password to the Communication Settings and Data Display screens ...

Page 139: ...oltages coming from the DSPEC 50 If one of these values varies by more than 2 V the corresponding bit is set 1 12V 2 12 V 3 24V 4 Temperature Set if the detector temperature increases and shuts down the HV therefore the SHUTDOWN bit will also be set 5 HV voltage Set if the high voltage deviates by more than 300 V from the value you entered in MAESTRO 6 Overload Set if the preamplifier overloads fo...

Page 140: ...C 50 queries the SMART 1 HPGe detector for its serial number The DSPEC 50 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 9 Power Set if the power fails during an acquisition 130 ...

Page 141: ...el and the activity units are entered by the user The report has this format Nuclide keV uCi m2 CO 60 1332 5 1 21E 01 10 2 CO 60 1173 2 1 09E 01 12 3 CO 57 122 1 1 48E 00 86 2 D 1 1 Calculations These are the calculations used to generate the Nuclide Report s Activity Uncertainty and Peak values Activity is calculated as follows NucCoef is normally the inverse of efficiency times the branching rat...

Page 142: ...IWidth is Uncertainty in percent is calculated as follows Peak is the position of the maximum count and is computed with the following equation MaximumROIChan is the channel in the ROI with the most counts If there are no data the center channel of the ROI is used EnergySlope and EnergyIntercept are the energy calibration values as entered on the digiDART LF keypad or by software If the values are...

Page 143: ...in The relation between pulse height and channel number slope of the curve Changes in either the intercept or gain can affect the positions of all the peaks in the spectrum When used with the zero stabilizer both the zero intercept and the gain slope will be monitored to keep all the peaks in the spectrum stabilized The zero stabilization and gain stabilization are separate functions in the DSPEC ...

Page 144: ...DSPEC 50 and DSPEC 502 Digital Gamma Ray Spectrometer User s Manual 932502G 0618 Intentionally blank 134 ...

Page 145: ...rns a block of 32 bit list mode words that begin with a 32 bit integer number of valid bytes followed by a 3 word CONNECTIONS time stamp thus the minimum of 4 words in a request The first word is the number of bytes returned not including the first 4 bytes The minimum value returned here is 12 for the three CONNECTIONS time stamp words only and the maximum is 65532 indicating 3 CONNECTIONS time st...

Page 146: ...all six requests were made in less than 1 second The following tables describe the format for the list mode data as returned by CONNECTIONS from the DSPEC 50 The ADC Word contains a raw 14 bit ADC value and a 16 bit real time stamp The Hardware Time Word contains the same 16 bit real time stamp In both cases this value represents the time that the word was created as represented by an internal clo...

Page 147: ...ated at the same time as the RT and LT words i e it always appears next to these words in the list mode data stream The count rate meter is incremented each time the ADC fast channel detects a pulse Since many pulses may be rejected before one is converted into an ADC event this number is not the simple sum of the ADC events over the past 10 ms instead it represents the true input count rate as we...

Page 148: ...DSPEC 50 and DSPEC 502 Digital Gamma Ray Spectrometer User s Manual 932502G 0618 Intentionally blank 138 ...

Page 149: ...rt setup tab 58 optimize 40 real time preset 55 rear panel connectors 27 70 Resolution Enhancer 48 ROI integral preset 55 ROI peak count preset 55 Spectrum screen 25 stabilizer setup 51 Status Setup screen 18 Switchboard screen 17 touchscreen 17 uncertainty preset 56 upper level discriminator 51 zero dead time ZDT mode 50 Enhanced throughput mode 6 Ethernet connectivity 34 troubleshooting 128 Feat...

Page 150: ...tus Setup screen 18 19 Switchboard screen 17 Throughput 41 42 Time constant 40 Touchscreen Big Numbers 27 Chart 24 Communication Control screen 20 Display Control screen 19 Gauges 22 import JPG files 19 Spectrum 25 static IP addressing 123 Switchboard screen 17 Transistor Reset 40 Troubleshooting 127 MAESTRO issues 127 reset lost password 128 static IP addresses 128 Uncertainty preset 56 Upper lev...

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