Braun MCA166-USB user manual Connection of detectors

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2.2.5 Connection of detectors

To connect a detector switch the device off. Before connecting the high voltage connector of the detector make sure that the built in High Voltage supply has the correct polarity and that the power consumption of the detector does not exceed the maximum value ( 0.5mA or 0.25 Watt).

On the right side of the MCA166-USB case (front view) the high voltage indicator is located (Figure 1). If it shines red a positive HV module is inserted, if it shines blue a negative HV module is present. If the indicator is black / dark gray no HV module is present. Furthermore, it is possible to check the HV polarity by software; go to the menu setup / high voltage and look at indicated polarity. The correct values for HV, polarity, and power consumption should be found in the detectors manual.

●Check by the detector manual that the pin assignment of the preamplifier power supply connector is compatible with the MCA166-USB, and that the power consumption does not exceed the maximum ratings (see Table 6, Chapter 6.2).

●Connect the cable for the preamplifier power supply of the detector to the concerning female D9 connector on the MCA166-USB and attach it by the clamps.

●Plug the BNC Signal connector of the detector to the female BNC input connector of MCA166-USB.

●Plug the High Voltage connector of detector into the female SHV connector of MCA166-USB.

If problems occur, it is possible to check the detector signal and the main amplifier signal (Amplifier Test out, see figure 1) with a scope. A typical signal which should be seen is shown in figure 2.

(V)

 

0

 

 

 

 

 

 

 

 

Signal

-0.01

 

 

 

-0.02

 

 

 

Detector

-0.03

 

 

 

-0.04

 

 

 

 

Amplifier (V)

1

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

0

5

10

15

Time (µs)

Figure 2:

Typical signals which can be seen at the detector preamplifier out and the amplifier test out. This example: CdZnTe Detector SDP310/Z/60, measuring a Cs137 sample, amplifier setting 200*0.91, negative pulses, 1µs shaping time, pulse height equals to about channel 662 of 1024 channels.

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Contents MCA166-USB Exclusion of liability MCA166-USBTable of Contents Appendix Introduction Users safety information HardwareGeneral Description Switching on Power managementCharging the MCA166-USB Connecting the MCA166-USB to a ComputerConnection of detectors Additional external battery pack and Power Pack SoftwareOverview MCS MS-DOS, WinMCS Windows Spec MS-DOS, WinSPEC WindowsU235 MS-DOS, WinU235 Windows UF6 MS-DOS, WinUF6Rate WinSCANIdentify Source Target MCAPlot and MCAPrintMiscellaneous MCA166-USB parameters for use with different detectorsIsotope Half-life Energy keV Branching ratio % Some of the most important photon energiesTechnical Data MCA166-USB Hardware SpecificationsAmplifier 2 ADC Battery Power supplyPreamplifier Voltages High VoltageMechanical specification Computer InterfaceEnvironmental ratings Block Diagram of the MCA166-USB Diagrams and pin connectionsContact Signal Contact Voltage Max. CurrentHV-Inhibit mode2 Troubleshooting Page MCA166-USB File Content Explanation $ROI File Content ExplanationFile Content Explanation $ENERFIT $SPECREM$PRESETS File Content $ADC$FASTDISCR 400 $SLOWDISCR $INPUT$MCSCHANNELS $POWERSTATE$MCSINPUT $MCSTIME$RECERRORCOUNTER File Content Explanation $RECCOUNTERFile Content Explanation $WINSPECINFO $SPECINTEGRALIcod Analysiscsratio$WINSPECINFO Analysismga$WINSCANINFO File Content Explanation $UF6INSPINFOOUT LOT LOT ID MBAMBA LOT LOT ID File Content Explanation $INSPINFOArea and the Area Uncertainty Function Appendix 2 MCA166-USB algorithm, formulasSmooth CentroidStrip Appendix 3 Description of the communication DLLs8 MCA166-USB A3.1.3 Functions to work with the MCA Mmcastartacquire MmcaresetMmcasetmodemcs MmcasetmodemcaMmcaclearmemory MmcacleartimeMmcasetpresetlivetime MmcasetpresetnoneMmcasetpresetrealtime MmcasetpresetintegralMmcasetroi MmcasetadcresdiscrMmcasetrepeat MmcasetmcschannelMmcasetmcsinputicr MmcasetmcsinputttlMmcasetmcsinputdiscr Mmcasetmcainputamplifierpos MmcasetgainMmcasetmcainputamplifierneg MmcasetmcainputdirectposMmcasetshapingtimelow MmcasetthresholdMmcasetshapingtimehigh MmcasetpileuprejectionMmcasetslow MmcasetfastMMCASETPZCMANUAL18 MMCASETPZCVALUE19Mmcasetstabilisation MmcasetpreamplifierpowerMmcasetstabparam MmcasethighvoltagesMmcasettdf MmcasetuserdataMMCASETUF6ROIS Mmcaqueryuserdata Contents of the Mmca User Date memory21Page Mmcaquerypower Mmcaquerystate Mcamode MODEMCA, ModemcsMcastabresult STABSTARTED, Stabactive Mcainputadc Adcamplifier ADC Directpos Adcdirectneg STABIDLE, StaberrorMcainputpol Inputpolaritypositive Inputpolaritynegative DTCMmcaquerysystemdata MMCAQUERYIMAGE36 Mmcaqueryenrichment MmcaqueryspectraMMCAQUERYUF6ROIS MMCAQUERYUF6INFOMmcaquerycentroid MmcaqueryonlineMmcaqueryvoltagecurrent Cmdstart CmdinitCmdstop StatestopModemca Modemcs CmdsetmodeCmdclear Clearmemory = Cleartime Clearroi ClearallPresetnone Presetreal Presetlive Presetint Presetarea CmdsetpresetsCmdsetadcresdiscr LLD, ULDCmdsetrepeat CmdsetmcschannelCmdsettimeperchannel Cmdsetgain CmdsetinputpolarityCmdsetmcainput Cmdsetmcsinput CmdsetthresholdCmdsetshapingtime Cmdsetpur CmdsetfastCmdsetslow Cmdsetpzctimeoffset CmdsetpzcCmdsetstabparam Cmdsetbias CmdsetpreamplifierpowerCmdsettdf CMDSETUF6ROICmdsetuserdata Cmdquerystate CmdquerypowerCmdqueryspectra CmdqueryimageCmdqueryuserdata CmdsystemdataCmdquerycentroid CMDQUERYUF6ROIS CmdqueryenrichmentAppendix 5 Changing the MCA166-USB Firmware

MCA166-USB specifications

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