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ORTEC

Alpha Duo

, Alpha Mega

and Alpha Ensemble

Integrated Alpha Spectrometer

Hardware User’s Manual

Printed in U.S.A.

ORTEC Part No. 932505

0520

Manual Revision F

Содержание Alpha Duo

Страница 1: ...ORTEC Alpha Duo Alpha Mega and Alpha Ensemble Integrated Alpha Spectrometer Hardware User s Manual Printed in U S A ORTEC Part No 932505 0520 Manual Revision F...

Страница 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 T...

Страница 3: ...nual 10 3 2 2 Automatic 10 3 3 Inserting a Sample into the Vacuum Chamber 10 3 4 Resolution Measurement and Calibration 11 3 5 MCB Properties in MAESTRO 12 3 5 1 Amplifier 12 3 5 2 Amplifier 2 13 3 5...

Страница 4: ...SPECIFICATIONS 27 5 1 Performance 27 5 2 Bias Supply 27 5 3 Calibration Pulser 28 5 4 Detector Current Monitor 28 5 5 Preamplifier 28 5 6 Digital MCA 29 5 7 Presets 29 5 8 Vacuum Chamber 30 5 9 Indica...

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: ...ns and the new module is ready for use Performance Duo Each of the two Alpha Duo channels has a vacuum gauge variable detector bias supply positive or negative preamplifier test pulser generator with...

Страница 8: ...utine At pressures 1 Torr to 13 Torr a change of 10 between the target and actual pressure triggers the automatic correction Outside this range the vacuum may not be controlled within 10 Recoil Contam...

Страница 9: ...operating software connecting the detec tors to it and connecting it to a vacuum pump Chapter 3 tells how to control the sample chamber pressure change samples and operate the Duo and Mega with MAESTR...

Страница 10: ...ORTEC Alpha Duo Alpha Mega Alpha Ensemble Hardware User s Manual 932505F 0520 Intentionally blank 4...

Страница 11: ...t Setup page be sure to select the USB based instruments family otherwise the Alpha unit s will not com municate properly with your ORTEC software Be sure to read the entire instruction sheet It discu...

Страница 12: ...should be able to select each of its spectrometers from the detector pick list within the software application at this point there will be no spectrum to view See Chapter 3 for instructions on using...

Страница 13: ...loves and make sure the white protective cap for the detector is in place Align the center pin in the top of the chamber with the center socket in the detector connector threads are right handed Insta...

Страница 14: ...ORTEC Alpha Duo Alpha Mega Alpha Ensemble Hardware User s Manual 932505F 0520 Intentionally blank 8...

Страница 15: ...g 9 page 16 AlphaVision On the Detector Grid click on the desired alpha chamber then click on the Hardware icon on the outlook sidebar Select the vent pump and hold settings as needed from the Pump dr...

Страница 16: ...and select VENT AlphaVision Turn off the detector bias pulser On the Detector Grid click on the desired alpha chamber then click on the Hardware icon on the outlook sidebar On the Pump droplist select...

Страница 17: ...er for resolu tion measurement or system calibration the following steps should be used for best results 1 Place the source on a sample tray and insert it into the Alpha chamber Placing the source as...

Страница 18: ...of the com puter selectable hardware controls including ADC setup parameters high voltage on off cham ber pressure controls and readouts and acquisition presets Just move from tab to tab and set your...

Страница 19: ...he InSight Virtual Oscilloscope mode This is typically not used in alpha spectroscopy For more information on the InSight mode see the MAESTRO User s Manual 3 5 3 ADC This tab Fig 5 contains the Conve...

Страница 20: ...cannot make further corrections in that direction The Center Channel and Width fields show the peak cur rently used for stabilization To enable the stabilizer enter the Center Channel and Width values...

Страница 21: ...leakage Current and chamber pressure information 3 5 6 About This tab Fig 8 displays hardware and firmware information about the currently selected Alpha chamber as well as the data Acquisition Start...

Страница 22: ...ns the target pressure 10 For pressures outside this range pressure may vary by more than 10 Note that if you try to assign two different Target settings to the chambers in one Alpha Duo both chambers...

Страница 23: ...ows the Presets tab The presets can only be set on an MCA that is not acquiring data 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 t...

Страница 24: ...a second These values are stored internally with a resolution of 20 milliseconds ms since the MCA clock incre ments by 20 ms Real time means elapsed time or clock time Live time refers to the amount...

Страница 25: ...osits of alpha emitting materials Decontamination of the chamber and of the detector if ULTRA or Ruggedized is indicated 4 1 1 Chamber Decontamination To decontaminate an Alpha chamber in place 1 Turn...

Страница 26: ...a cotton swab into the water and then carefully blot on a clean tissue to remove the excess 4 GENTLY swab the aluminum surface of the detector DO NOT scrub the detector Gently wiping the detector s al...

Страница 27: ...4 Use a 3 32 in hex head wrench to unscrew the three socket head cap screws holding the chamber in place Remove the two top screws first and the bottom screw last 5 Pull the chamber out slightly abou...

Страница 28: ...ct the octal connector to the vacuum gauge 2 Reconnect the vacuum hose Make sure it is still connected to the valve below 3 Connect the ground wire tighten the screw and solder the center lead on the...

Страница 29: ...el hardware Device Manager utility to con firm the ORTEC USB driver is installed correctly For further assistance contact your ORTEC representative or our Global Service Center 4 3 2 Data or Settings...

Страница 30: ...the vacuum valve for an Alpha module is in either the VENT or HOLD position its cham bers are isolated from the vacuum manifold Most vacuum problems can be easily isolated using a systematic approach...

Страница 31: ...they are suspect When looking for vacuum problems check things that have been recently changed If an individual Duo reads high it is likely to be a thermocouple reading error since a leak in one chamb...

Страница 32: ...ORTEC Alpha Duo Alpha Mega Alpha Ensemble Hardware User s Manual 932505F 0520 Intentionally blank 26...

Страница 33: ...to 41 mm in 4 mm increments using slide in sample trays Maximum distance from detector to bottom of chamber is approxi mately 44 mm Maximum Detector Size Duo 1200 mm2 Mega 3000 mm2 Energy Range 0 to...

Страница 34: ...y Stability 50 ppm C Amplitude Drift typically 150 ppm C Long Term Drift typically 0 005 of full scale 24 hours at constant temperature On Off Computer controlled 5 4 Detector Current Monitor Range 0...

Страница 35: ...y Channels Software selectable range from 0 to conversion gain digital offset Digital Spectrum Stabilizer Controlled via computer stabilizes gain errors Dead Time Correction Extended live time correct...

Страница 36: ...RCAP Option Duo only Automatic pressure controller requires addi tion of optional biased sample holders Controls chamber pressure in the range of 1 Torr to 13 Torr 10 Biased sample tray not available...

Страница 37: ...Duo and Mega Power Input 120 240 V ac 50 60 Hz Power Consumption 10 W input power Operating Environment 0 to 50 C to 95 relative humidity non condensing Dimensions 25 7 cm W 36 6 cm D 15 2 cm H 10 1 i...

Страница 38: ...sed on page 47 If the feature is supported in the Duo or Mega the bit will be set to 1 if the feature is not supported the bit will be 0 Bit Meaning 0 Software selectable conversion gain 1 Software se...

Страница 39: ...vel discriminator 35 Software selectable upper level discriminator 36 MCS mode SCA input available 37 MCS mode positive TTL input available 38 MCS mode fast negative NIM input available 39 MCS mode di...

Страница 40: ..._EXT 67 Explorable with MCS list commands LIST_SOURCE LIST_LLSCA LIST_ULSCA 68 Device supports the MDA preset 69 Software selectable ADC type MatchMaker 70 Has ability to daisy chain MCBs DART 71 Zero...

Страница 41: ...SH_TIME_SAMPLE 100 Adjustable Sample mode time per channel SET LIST_TIME_SAMPLE 101 List Mode data streamed and formatted as in digiBASE 102 Supports ETP mode ENA DIS SHOW_ETP 103 List Mode data strea...

Страница 42: ...ORTEC Alpha Duo Alpha Mega Alpha Ensemble Hardware User s Manual 932505F 0520 119 120 121 122 123 124 125 126 127 Extended feature mask available SH_FEAT_EXT 36...

Страница 43: ...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 g...

Страница 44: ...r of parameters 133 Invalid command 134 Response buffer too small 135 Not applicable while active 136 Invalid command in this mode 137 Hardware error 138 Requested data not found Micro error codes 0 S...

Страница 45: ...s 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 com...

Страница 46: ...W are cleared If start and length are specified region of interest flags for the channels specified by start and length are cleared DISABLE_GAIN_STABILIZATION Stops stabilization of the gain peak whil...

Страница 47: ...e sent to the host if alarms are enabled for the device whose acquisition is stopped see ENABLE_ ALARM command Overflow presets may be independently set for each of the devices in an Alpha Duo See als...

Страница 48: ...ified sets all channels of spectral data in the window of interest see SET_WINDOW command to the specified value ROI flags are not affected SET_DATA_APP entry data Stores information such as sample de...

Страница 49: ...be enabled The absolute minimum width for the gain peak is 3 channels See also SHOW_GAIN_WIDTH SET_GAIN_CHANNEL and SHOW_GAIN_CHANNEL SET_HV value This sets the bias to value in volts and stores value...

Страница 50: ...e that if the digital offset is set to a value greater than the current conversion gain setting no counts can be processed since the entire spectrum is shifted out of the segment See also SHOW_OFFSET...

Страница 51: ...tempt to change it Always 1 for the Alpha Duo SET_TRUE ticks Sets the true time counter for the currently selected segment to the specified number of ticks The number represents true time in units of...

Страница 52: ...in for each segment The record is organized as follows J0819200001aaaaa00000 65 zeros here for total of 75 zeros 00000ccc where aaaaa represents the conversion gain for segment 1 and ccc represents th...

Страница 53: ...orted as 1024 channels C02048101 CR Conversion gain reported as 2048 channels C04096106 CR Conversion gain reported as 4096 channels SHOW_GAIN_FINE Returns the current fine gain setting See SET_GAIN_F...

Страница 54: ...1 Bias supply overload 0 overload 1 normal Bit 2 High voltage enabled 0 disabled 1 enabled Example Responses D0200000003077 CR 2000 V negative not overloaded disabled D0200000002076 CR 2000 V positiv...

Страница 55: ...OW_INTEGRAL_PRESET Reports the current ROI integral preset value for the currently selected segment See SET_ INTEGRAL_PRESET for more information about the ROI integral preset See also SHOW_INTEGRAL R...

Страница 56: ...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...

Страница 57: ...l is 2147483646 G2147483647121 CR 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...

Страница 58: ...the currently selected segment that have the ROI flag set The response is of the form Dsssssnnnnnccc CR where sssss represents an integer number that is the number of the first channel of the first g...

Страница 59: ...used Bit 4 Amplifier pole zeroed since initialization 0 normal 1 needs pole zeroing Bits 5 7 Unused Bit 8 Amplifier Automatic Pole Zero 1 Auto Pole Zero in progress 0 normal Bits 9 14 Unused Bit 15 MS...

Страница 60: ...in the form Fmmmm vvv CR where mmmm is a 4 character model designator and vvv is a 3 character version designator Example Responses FADUO 002 CR Alpha Duo firmware version 2 reported SHOW_WINDOW Repo...

Страница 61: ...for compatibility with other MCBs and may be any value from 0 to 65535 but is ignored by the Alpha Duo STOP seg mask Stops the acquisition of spectral data in the currently selected segment The option...

Страница 62: ...ORTEC Alpha Duo Alpha Mega Alpha Ensemble Hardware User s Manual 932505F 0520 Intentionally blank 56...

Страница 63: ...Ensemble The vacuum USB and power connections from the Ensemble housing to the Duo rear panel are clearly visible 3 Next unscrew the Phillips head screws from the top panel of the module and set the p...

Страница 64: ...the faceplate chamber assembly out of the enclosure As you detach the connectors make sure each is labeled with its corre sponding PWB input the only consequence of improper reconnection is that the...

Страница 65: ...eir respective side edge of the PWB SW 102 and 202 are nearest the center line of the board just inboard of each side s silver amplifier shield SW 100 and 200 are located under each side s respective...

Страница 66: ...ORTEC Alpha Duo Alpha Mega Alpha Ensemble Hardware User s Manual 932505F 0520 Fig 16 Inside the Alpha Duo Fig 17 Alpha Mega Faceplate and Chamber Pulled Out of Enclosure 60...

Страница 67: ...them to negative polarity or toward the front panel for positive polarity 7 Replace the amplifier shield it should click into place 8 Install the new detector according to Section 2 4 9 You are now re...

Страница 68: ...ng Conversion Gain 4096 Lower Level Disc 40 Upper Level Disc 4095 5 On the Stabilizer make sure the Gain Stabilization Enabled checkbox is unmarked 6 On the Alpha tab set the following Digital offset...

Страница 69: ...panel HV Pulser indicator should begin blinking and a peak should begin accumulating in the spectrum window 16 Referring to Fig 18 turn the pulser adjustment screw potentiometer R172 for the LEFT cha...

Страница 70: ...ORTEC Alpha Duo Alpha Mega Alpha Ensemble Hardware User s Manual 932505F 0520 Intentionally blank 64...

Страница 71: ...Kit 5 Detector change to opposite polarity detector 57 determining type 57 installation 6 Digital offset 16 Ethernet option 1 Gain stabilization Initialize 14 Installation connecting the vacuum sourc...

Страница 72: ...ORTEC Alpha Duo Alpha Mega Alpha Ensemble Hardware User s Manual 932505F 0520 Intentionally blank 66...

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