Gbs-elektronik MCA166-USB Manuel d'utilisateur

Miniature Multi-Channel AnalyzerMCA166-USBUser’s ManualVersion 3.0

MCA166-USBTypical errors which may be observed with the detector preamp signal are:● Rise time is too slow (>0.5 µs). This may cause that the pile

3.2 SPEC (MS-DOS), WinSPEC (Windows)These programs are the default programs for measuring spectra. It supports semi-automated me

MCA166-USB3.7 RATEThis program supports measurements of count rates with any radiation detector (HPGe, NaI, CdTe, CdZnTe and neutron counters). In the

3.10 MCAPlot and MCAPrintMCAPlot and MCAPrint are programs to view and print spectra recorded with the MCA166-USB. Up to 32 sp

MCA166-USB3.13 MiscellaneousFor communication and evaluation some libraries for MS Windows and Linux are available. This may

5 Some of the most important photon energiesTable 3: Photon energies for different isotopesIsotope Half-life Energy (keV) Branching ratio (%)Am241 432

MCA166-USB6 Technical Data6.1 MCA166-USB Hardware Specifications6.1.1 Amplifier1. Type● Gaussian programmable shaping amplifier with pile-up rejector

6.1.2 ADC1. Successive approximation ADC with sliding scale linearisation● Channel splitting 128, 256, 512, 1K, 2K, or 4K● Full input voltage range 3V

MCA166-USB6.1.3 Power supply● Power supply adequate for commonly used NaI, HPGe, CdTe and proportional counters● Current limited mode with indica

6.1.7 Computer Interface● RS-232C serial port● USB 1.1; virtual COM port is used● 38.400Baud and 307.200Baud; both baud rates available on both interf

MCA166-USBExclusion of liabilityThe GBS Elektronik GmbH is not liable for errors and does not guarantee the specific utility of the MCA166-USB softwar

MCA166-USB6.2 Diagrams and pin connectionsFigure 3: Block Diagram of the MCA166-USB20

Table 4: Wiring Diagram of the Charger Input Connector (female Lemo 00-302)Contact Signal1 + charge voltage2 - charge voltageTable 5: Wiring Diagram o

MCA166-USB7 TroubleshootingGeneral Remark:Before changing anything concerning the hardware, plugging or pulling cables etc. shut down the high voltage

5. The threshold of the spectrum seems to be much higher than expected.● The input polarity may be wrong. Does the threshold depend on radioactive so

MCA166-USB12. Bad resolution in a HPGe spectrum or from a test generator, specially at high amplification factors● Check electrical noise and E

APPENDIX 1 - MCA166-USB spectral data formatThe MiniMCA spectral data format is in compliance with the IAEA SPE Spectral Data Format (see SPEDAC PRO

MCA166-USBSetup InformationFILE CONTENT EXPLANATION$ADC: ADC resolution4096 Channels0 LLD (lower level discriminator channel)3967 ULD (upper level dis

Setup information - continued$MCS_CHANNELS: Multi Channel Scaler (MCS) Setup4096 Channels$MCS_INPUT: MCS input Extern TTL Extern TTL (external TTL s

MCA166-USBSetup information’s – continuedFILE CONTENT EXPLANATION$REC_COUNTER: Counter of received commands 2823$REC_ERROR_COUNTER: Counter of receive

WinSPEC (inspection information if CsRation is attached)FILE CONTENT EXPLANATION$WINSPEC_INFO: WinSPEC inspection informationANALYSIS:CSRATIO Extern a

Table of Contents1 Introduction...

MCA166-USBWinSCAN (inspection information)FILE CONTENT EXPLANATION$WINSCAN_INFO:WinSCAN inspection information1999/001 Inspection number1999/11/01 Ins

UF6 / WinUF6 (inspection information) - continuedFILE CONTENT EXPLANATIONICODInstrument code50156 MMCA ID8289/025 Computer IDNAJ Detector type9475/029

MCA166-USBAPPENDIX 2 - MCA166-USB algorithm, formulasThis appendix lists the algorithms used by the MiniMCA for the following functions: ● Area, Are

Centroid:The peak centroid is the sum of the channel contents7 times the channel number divided by the sum of the channel contents in the range of th

MCA166-USBStrip:Strip subtracts a specified fraction of the spectrum. The Strip factor can be “positive“ or “negative“ :Spectrum = Spectrum - F*Spectr

APPENDIX 3 - Description of the communication DLLs8A3.1 MS-Windows DLL for communication with one MCA166-USBThe Dynamic Link Library exists as a 16-

MCA166-USBThe first argument is a string with the name of the command. In the following table all available commands (use of capital and small letters

The other arguments are the parameters of the firmware command. These arguments are optional since not all commands use the same number of paramete

MCA166-USBA3.2 Command setMCA Reset Command:Name MMCA_RESETDescription All MCA Parameters will be reset to their initial state and the spectra are cle

MCA Mode Commands:NameMMCA_SET_MODE_MCADescription The command sets the acquire mode to Multi-Channel AnalyserParameter -Results -Return Code see MMCA

MCA166-USB6.1.4 Preamplifier Voltages...186.1.5 High Voltage...

MCA166-USBMCA Measurement Setup Commands:NameMMCA_SET_PRESET_NONEDescription None preset Parameter -Results -Return Code see MMCA_RESET commandNameMMC

NameMMCA_SET_ADC_RES_DISCRDescription The command sets the ADC resolution and the software discriminator range.1. Parameter Channels integer value 128

MCA166-USBNameMMCA_SET_MCS_INPUT_ICRDescription The command selects the count rate signal as MCS input.Parameter -Results -Return Code see MMCA_RESET

MCA Hardware Setup Commands:NameMMCA_SET_GAINDescription The command sets the amplifier coarse and fine gain.1. Parameter Coarse gain integer value 2,

MCA166-USBNameMMCA_SET_THRESHOLDDescription The command sets the analog threshold 1. Parameter Threshold integer value 2 ... 60Results -Return Code se

NameMMCA_SET_FASTDescription The command sets the fast discriminator threshold. 1. Parameter Threshold integer value 0 ... 2499, default 400Results -R

MCA166-USBMCA Stabilisation Commands:NameMMCA_SET_STABILISATIONDescription The command sets the peak stabilisation.1. Parameter Stabilisation flag Int

MCA Data Setup Commands:NameMMCA_SET_TDFDescription The command sets the dead time correction parameter. 1. Parameter Tdf integer value 100 ... 3000,

MCA166-USBMCA Query Commands: NameMMCA_QUERY_USER_DATADescription The command reads 32 user data (32 bit values) from the MCA parameter memory.1. Para

Byte Offset 64 1. ROI pair (ROI End)25Byte Offset 66 1. ROI pair (ROI Begin)Byte Offset 68 2. ... ...Byte Offset 120 15.Byte Offset 124 16. ROI pairBy

1 IntroductionThe MiniMCA MCA166-USB is a battery powered high performance 4K Multi-Channel Analyzer/Multi-Channel Scaler module comparable

MCA166-USBNameMMCA_QUERY_POWERDescription The command reads the MMCA power state.Parameter -Result array Battery current [mA] long valueByte Offset 4

NameMMCA_QUERY_STATEDescription The command reads the MMCA state.Parameter -Results array MCA acquire mode MCA_MODE MODE_MCA, MODE_MCSByte Offset 2 MC

MCA166-USBNameMMCA_QUERY_STATESTAB_IDLE, STAB_ERRORByte Offset 72 Stab. ROI begin integer valueByte Offset 74 Stab. ROI end integer valueByte Offset 7

NameMMCA_QUERY_SYSTEM_DATADescription The command reads the MMCA system data.Parameter -Results array 0 integerByte Offset 2 Peak detect counter 48 Bi

MCA166-USBByte Offset 116 Stabilisation area preset longByte Offset 120 Stabilisation time preset integer valueByte Offset 122 Low shaping time34 byt

NameMMCA_QUERY_SPECTRADescription The command read the MMCA spectrum data.1. Parameter No. of 1. Channel and read out control37integer value2. Paramet

MCA166-USBNameMMCA_QUERY_UF6_INFODescription The command reads current dead time, real time the integral, begin and end of the UF6 ROIsParameter -Resu

NameMMCA_QUERY_VOLTAGE_CURRENTDescription The command reads the voltages and currents from the MMCA.Parameter -Results array Charger current [mA] long

MCA166-USBAPPENDIX 4 - Description of the MCA166-USB firmware functionsMCA Reset Command:Command nameCMD_INITDescriptionAll MCA Parameters will be r

MCA Mode Command:Command nameCMD_SET_MODEDescriptionDepending on the value of the first parameter (mod):MODE_MCA = 0MODE_MCS = 1the command set MMCA t

MCA166-USB2 Hardware2.1 Users safety informationRead all these instructions first!Save these instructions for later use.Do Not Remove ConnectorsTo avo

MCA166-USBMCA Measurement Setup Commands:Command nameCMD_SET_ADC_RES_DISCRDescription The command set the ADC resolution(res: 128, 256 … 4096), the LL

Command nameCMD_SET_REPEATDescription The command sets the number(rep: 0 ... 65535) of sweeps for repetitive measurement.Command syntaxFormat integer

MCA166-USBMCA Hardware Setup Commands:Command nameCMD_SET_GAINDescription The command sets the amplifier coarse(cg) and fine gain(fg).cg: 2, 5, 10, 20

Command nameCMD_SET_MCS_INPUTDescriptionThe command sets the input for the Multi-Channel Scaler.ip = 0 external TTL signalsip = 1 internal count rate

MCA166-USBCommand nameCMD_SET_PURDescription The command sets the pile up rejection.Command syntaxpur = 0 turns PUR offpur ≠ 0 turns PUR onFormat int

Command nameCMD_SET_PZCDescriptionThe command performs the Pole Zero Cancellation.pv: 0 ... 2499 PZC control voltagepm = 0 set PCZ only pm > 0 set

MCA166-USBMCA Stabilisation Commands: Command nameCMD_SET_STABILISATIONDescriptionThe command sets the peak stabilisation.fl: 0 turns stabilisation o

MCA Detector Power Commands:Command nameCMD_SET_PREAMPLIFIER_POWERDescriptionThe command sets the preamplifier power(pp).0X80 -24V on0X40 +24V on0X20

MCA166-USBMCA Data Setup Commands:Command nameCMD_SET_TDFDescriptionThe command sets the TDF parameter.tdf: TDF(100 ... 3000, default 800)Command syn

MCA Query Commands: Command nameCMD_QUERY_POWERDescription The command reads the power state.Command syntaxFormat integer integer integer long integer

2.2.1 Power managementThe MCA166-USB works with a built in rechargeable Li-Ion battery, which has no memory effect and is deep discharge and shor

MCA166-USBCommand nameCMD_QUERY_USER_DATADescriptionThe command reads a 32 bit value from the MCA parameter memory.e: 0 ... 63 parameter numberCommand

Command nameCMD_QUERY_ENRICHMENTDescriptionThe command read the integral of two ROIs and the real and dead time.pb: Peak1 beginbb: Peak2 beginpl: Peak

MCA166-USBAPPENDIX 5 - Changing the MCA166-USB FirmwareAttention:The order of changing the switches must be followed exactly, otherwise the µP will

MCA166-USB2.2.3 Charging the MCA166-USBCharging the MCAs battery is usually done by connecting the wall adapter to the ”Charger In” connector and powe

2.2.5 Connection of detectorsTo connect a detector switch the device off. Before connecting the high voltage connector of the d