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ORTEC

®

 EASY-MCA™ Digital Gamma-Ray Spectrometer User’s Manual

931044C / 1014

12

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 incre-
ments 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 (i.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 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 on 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 after the preset is entered without affecting the uncertainty calcu-
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 way as the MAESTRO
Peak Info command.

Содержание EASY-MCA-2K

Страница 1: ...ORTEC EASY MCA 8K EASY MCA 2K Digital Gamma Ray Spectrometer User s Manual Printed in U S A ORTEC Part No 931044 1014 Manual Revision C...

Страница 2: ...3 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...

Страница 3: ...B Configuration to Communicate With Your MCBs 7 2 2 4 1 Configuring a New Instrument 8 2 2 4 2 Customizing ID Numbers and Descriptions 8 2 2 5 Attaching More Than One EASY MCA to the Computer 9 2 2 6...

Страница 4: ...l Gamma Ray Spectrometer User s Manual 931044C 1014 iv 3 2 Feature Mask Bits 18 4 FIRMWARE COMMANDS AND RESPONSES 23 4 1 Command Format 23 4 2 Error Codes 23 4 2 1 Dollar Response Records 24 4 2 2 MCB...

Страница 5: ...nstruction 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 determ...

Страница 6: ...vi...

Страница 7: ...d live time method 1 The EASY MCA communicates via high speed USB and up to eight units can be controlled by a single computer Features Fast 1 25 s ADC and memory Onboard memory allows fast downloads...

Страница 8: ...ORTEC EASY MCA Digital Gamma Ray Spectrometer User s Manual 931044C 1014 2 Intentionally blank...

Страница 9: ...25 s Zin 1 k dc coupled No internal delay GATE Optional positive TTL input In MAESTRO select the Coincidence Anticoin cidence or Off gate mode from the ADC property page see Section 2 3 1 The signal m...

Страница 10: ...g the EASY MCA 2 1 3 Cabling for Spectroscopy Figure 3 shows the standard cabling of an EASY MCA in an HPGe detector system If the detec tor has a TRP preamplifier PLUS model all connections shown bel...

Страница 11: ...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 MAES...

Страница 12: ...t 2 Windows will indicate that the EASY MCA 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 d...

Страница 13: ...power on all other local and network ORTEC instruments to be used as well as their associated computers Otherwise the MCB Configuration program will not detect them during installation Any instruments...

Страница 14: ...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...

Страница 15: ...etector droplist on the Toolbar 2 3 EASY MCA MCB Properties in MAESTRO This section discusses the hardware setup dialog you will see within MAESTRO and all other ORTEC CONNECTIONS software e g GammaVi...

Страница 16: ...with gating in Coincidence 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 co...

Страница 17: ...s the Presets tab MDA presets are on a separate tab The presets can only be set on an MCB that is not acquiring data during acquisition the preset fields are disabled You may use any or all of the pre...

Страница 18: ...til 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 a...

Страница 19: ...make on this screen are saved in the MCB memory and have no direct link to MDA methods selected in the analysis options for applications such as GammaVision ScintiVision ISOTOPIC etc The MDA preset c...

Страница 20: ...4 Troubleshooting 2 4 1 MAESTRO Does Not Connect with the EASY MCA If properly installed and functioning MAESTRO software or other ORTEC spectroscopy applications cannot find and communicate with the...

Страница 21: ...MCA If MCB Configuration hangs i e fails to run to completion click on Cancel then cycle the power to the EASY MCA by disconnecting and reconnecting its power cable The MCB Configuration program will...

Страница 22: ...ORTEC EASY MCA Digital Gamma Ray Spectrometer User s Manual 931044C 1014 16 Intentionally blank...

Страница 23: ...up memory per MCB 231 1 counts per channel 2 109 LLD Software selectable from 1 to 100 full scale ULD Software selectable from 0 to 100 full scale Presets Real Time Live Time Multiples of 20 ms Region...

Страница 24: ...input used by live time correction circuits Accepts TTL signal signal must occur prior to peak detect Zin 1 k BNC connector USB High speed USB 480 Mbps interface 12 V DC External power input from wall...

Страница 25: ...E_START 17 Sample changer support SET SHOW_OUTPUT SHOW_INPUT 18 One button acquisition ENA DIS SHOW_TRIG_SPEC MOVE 19 Nomadic likely to move between opens 20 Local app data SET_DATA_APP SHOW_DATA_APP...

Страница 26: ...SET SHO VERI_BLR 51 SHOW_STATUS command supported returns M record 52 Overflow preset ENA DIS SHO_OVER_PRES 53 Software enabled MicroNOMAD style audio clicker ENA DIS_CLICK 54 Software readable therm...

Страница 27: ...MART 1 Detector support SHOW_SMART_DET SHOW_SNUM_DET SHOW_HV_RECO 90 Nuclide report SET SHOW_NUCL_COEF SET SHOW_ROI_NUCL 91 Interactive Display Features Such as Nuclide Report 92 Advanced Stored Spect...

Страница 28: ...not user changeable from property page requires Bit 96 110 Portal Monitor style List Mode Synch is available 111 DSPEC Pro Auxilliary BNC input available 112 SET_DISPLAY is NOT used to select ZDT data...

Страница 29: ...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 SE...

Страница 30: ...id command in this mode 137 Hardware error 138 Requested data not found Micro error codes 0 Success 1 Input already started stopped 2 Preset already exceeded 4 Input not started stopped 64 Parameter w...

Страница 31: ...ed 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 prac...

Страница 32: ...e channels in the window of interest see SET_WINDOW command in the currently selected device see SET_DEVICE command are cleared DISABLE_OVERFLOW_PRESET Disables the overflow preset Channels that recei...

Страница 33: ...t can be used by other programs such as sample descriptions and energy calibrations CONNECTIONS uses this feature String1 the data identifier 32 bytes maximum string2 the data 128 bytes maximum SET_DE...

Страница 34: ...I integral may exceed the preset value by up to 512 counts due to the pipelined archi tecture of the EASY MCA Setting an integral preset to 0 counts disables the preset The integral preset may be set...

Страница 35: ...eakNumber 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 compatibility software that only supports t...

Страница 36: ...ly this value is set by the EASY MCA 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 da...

Страница 37: ...URATION_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 re...

Страница 38: ...n gain reported as 2048 channels C04096106 CR Conversion gain reported as 4096 channels C08192107 CR Conversion gain reported as 8192 channels SHOW_GATE Reports the current mode of operation of the AD...

Страница 39: ...as 1 tick 20 ms G4294967295132 CR 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...

Страница 40: ...urns 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_NEXT Used in conjuncti...

Страница 41: ...ount in an ROI channel is 1 G2147483646120 CR Maximum count in an ROI channel is 2147483646 G2147483647121 CR Maximum count in an ROI channel is 2147483647 SHOW_PEAK_CHANNEL This command returns the n...

Страница 42: ...Responses D0100000050078 CR First ROI group starts at channel 1000 and is 50 channels long D0215000150086 CR First ROI group starts at channel 2150 and is 150 channels long D0000000000072 CR No ROI gr...

Страница 43: ...mization since initialization 0 normal 1 needed Bits 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 Reser...

Страница 44: ...ersion 2 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 8192 and yyyyy is the number o...

Страница 45: ...lower level discriminator 10 MCB Properties in MAESTRO 9 MDA preset 13 overflow preset 13 real time preset 12 ROI integral preset 12 ROI peak count preset 12 uncertainty preset 12 upper level discrim...

Страница 46: ...ORTEC EASY MCA Digital Gamma Ray Spectrometer User s Manual 931044C 1014 40...

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