Benutzeranleitung / Produktwartung MCA166-USB des Produzenten GBS Elektronik
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Miniature Multi-Channel Analyzer MCA166-USB User’s Manual Version 3.0.
MCA 166- USB Exclusion of liability The GBS Elektronik GmbH is not liable for errors and does not guarantee the specific utility of the MCA166-USB software or firmware. In particular, the GBS Elektronik GmbH is not liable for indirect or subsequent damages due to errors of the MCA166-USB software or firmware.
Table of Contents 1 Introduction....................................................................................................................... 5 2 Hardware.......................................................................................
MCA 166- USB 6.1.4 Preamplifier Voltages..................................................................................... 18 6.1.5 High Voltage.................................................................................................. 18 6.
1 Introduction The MiniMCA MCA166-USB is a battery powered high performance 4K Multi-Channel Analyzer/Multi-Channel Scaler module comparable in its performance with laboratory grade MCA. High voltage supply for detector and preamplifier power suppl y are integrated as well as an internal amplifier and pulse shaping net work.
MCA 166- USB 2 Hardware 2.1 Users safety information Read all these instructions first! Save these instructions for later use. Do Not Remove Connectors To avoid personal injury or damage of equipment,.
2.2.1 Power management The MCA166-USB works with a built in rechargeable Li-Ion battery, which has no memory effect and is deep discharge and short circuit protected. If the device is working, the remaining battery life time is permanently checked. W hen the battery voltage has dropped down to 6.
MCA 166- USB 2.2.3 Charging the MC A 166- USB Charging the MCAs battery is usually done by connecting the wall adapter to the ”Charger In” connector and power it from the mains supply.
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.
MCA 166- USB Typical errors which may be observed with the detector preamp signal are: ● Rise time is too slo w (>0.5 µs). This may cause that the pile up rejector does not work correctly. There may be even a large amount of regular pulses rejected and especially the high energetic part of the spectrum seriously affected.
3.2 SPEC (MS-DOS), WinSPEC (Windows) These programs a re the d efault programs for measuring spectra. It supports semi- automated measurements of gamma ray spectra with the MCA166-USB. The spectra are stored on mass storage media on a PC. There are t wo variants of W inSPEC.
MCA 166- USB 3.7 RATE This program supports measurements of count rates with any radiation detector (HPGe, NaI, CdTe, CdZnTe and neutron counters). In the most convenient mode of operation only the me.
3.10 MCAPlot and MCAPrint MCAPlot and MCAPrint ar e programs to view and print spectra recorded with the MCA166-USB. Up to 32 spectra can be viewed at the same time and be printed on one page. Also some evaluation functions are available. MCAPlot is not included in the MCA price.
MCA 166- USB 3.13 Miscellaneous For communication and evaluation some libraries for MS W indows and Linux are available. This may help the make own application programs or to integrate the MCA166-USB in an existing system.
5 Some of the most important photon energies Table 3: Photon energies for different isotopes Isotope Half-life Energy (keV) Branching ratio (%) Am241 432.2y 26.34/59.54 2.4/36 Cd109 462.6d 88.03 3.63 Bi214 19.9min, daughter of Ra226 609.31 46.09 Ce139 137.
MCA 166- USB 6 Technical Data 6.1 MCA166-USB Hardware Specifications 6.1.1 A m plifier 1. Type ● Gaussian programmable shaping amplifier with pile-up rejector and gated base line restorer 2.
6.1.2 A D C 1. Successive approximation ADC with sliding scale linearisation ● Channel splitting 128, 256, 512, 1K, 2K, or 4K ● Full input voltage range 3V, positive and negative (10V with external attenuator) 2. ADC Dead time (including time needed to write into memory) ● < 8 µsec 3.
MCA 166- USB 6.1.3 Power supply ● Power suppl y adequate for commonly used NaI, HPGe, CdTe and proportional counters ● Current limited mode with indication of overload condition through software; short circuit protected and automated recovery after overload or shortening 6.
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 interfaces ● proprietary software protocol 6.1.8 Mechanical specification ● Size: 155mm x 95mm x 45mm (footprint of palmtop HP200LX) ● Weight: app.
MCA 166- USB 6.2 Diagrams and pin connections Figure 3: Block Diagram of the MCA166-USB 20.
Table 4: Wiring Diagram of the Charger Input Connector (female Lemo 00-302) Contact Signal 1 + charge voltage 2 - charge voltage Table 5: Wiring Diagram of the PC Interface Connector (female Lemo 0S-3.
MCA 166- USB 7 Troubleshooting General Remark: Before changing anything concerning the hardware, plugging or pulling cables etc. shut down the high voltage and switch off the MCA. Soldering or manipulating with the SMD boards is strongl y not recommended for users.
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 source and count rate? Try some other input polarity. ● P/Z may not be set correctly. Please check if P/Z is correctly adjusted.
MCA 166- USB 12. Bad resolution in a HPGe spectrum or from a test generator, specially at high amplification factors ● Check electrical noise and EMC compatibilit y of surroundings. Some laptops and also some switch mode p ower supply battery chargers may d isturb.
A P PENDIX 1 - MCA 166- USB spectral data format The MiniMCA spectral data format is in compliance with the IAEA SPE Spectral Data Format (see SPEDAC PRO User’s Manual Rel.
MCA 166- USB Setup Information FILE CONTENT EXPLANATION $ADC: ADC resolution 4096 Channels 0 LLD (lower level discriminator channel) 3967 ULD (upper level discriminator channel) $PRESETS: MCA Presets .
Setup information - continued $MCS_CHANNELS: Multi Channel Scaler (MCS) Setup 4096 Channels $MCS_INPUT: MCS input Extern TTL Extern TTL (external TTL signal), Input Rate (count rate from the internal amplifier / fast discriminator) $MCS_TIME: MCS time per channel 10 Time in msec , 0.
MCA 166- USB Setup information’s – continued FILE CONTENT EXPLANATION $REC_COUNTER: Counter of received commands 2823 $REC_ERROR_COUNTER: Counter of received commands with errors 2 $SPEC_INTEGRAL: Counts in the spectrum 4098917 $ROI_INFO: ROI information 1 266 332 299.
WinSPEC (inspection information if CsRation is attached) FILE CONTENT EXPLANATION $WINSPEC_INFO: WinSPEC inspection information ANALYSIS:CSRATIO Extern analysis application attached with WinSPEC 1999/.
MCA 166- USB WinSCAN (inspection information) FILE CONTENT EXPLANATION $WINSCAN_INFO: WinSCAN inspection information 1999/001 Inspection number 1999/11/01 Inspection date Inspector1/Inspector2 Inspect.
UF6 / WinUF6 (inspection information) - continued FILE CONTENT EXPLANATION ICOD Instrument code 5 0156 MMCA ID 8289/025 Computer ID NAJ Detector type 9475/029 Detector ID Collimator Collimator Filter .
MCA 166- USB A P PENDIX 2 - MCA166-USB algorithm, formulas This appendix lists the algorithms used by the MiniMCA for the following functions: ● Area, Area uncertainty ● Centroid ● FWHM ● Smoo.
Centroid: The peak centroid is the sum of the channel contents 7 times the channel number divided by the sum of the channel contents in the range of the channels above the half maximum: Centroid = i S.
MCA 166- USB Strip: Strip subtracts a specified fraction of the spectrum. The Strip factor can be “positive“ or “negative“ : Spectrum = Spectrum - F * Spectrum y ' y x where Spectrum y &a.
A P PENDIX 3 - Description of the communication DLLs 8 A3.1 MS-Windows DLL for communication with one MCA166-USB The Dynamic Link Library exists as a 16-bit variant (mca_comm.dll) and as a 32-bit variant (mca32com.dll). The DLL must reside in the system directory of Windows or in the same directory as the calling application.
MCA 166- USB The first argument is a string with the name of th e command. In the following table all available commands (use of ca pital and small letters is possible), the corresponding firmware specific names and the number of the required parameters are listed.
The other arguments are the parameters of the firmware command. These arguments are optional since not all commands use the same number of parameters. Unnecessary arguments you can leave out. Information about the parameters you can find in appendix 4.
MCA 166- USB A3.2 Command set MCA Reset Command: Name MMCA_RESET Description All MCA Parameters will be reset to their initial state and the spectra are cleared.
MCA Mode Commands: Name MMCA_SET_MODE_MCA Description The command sets the acquire mode to Multi-Channel Analyser Parameter - Results - Return Code see MMCA_RESET command Name MMCA_SET_MODE_MCS Descri.
MCA 166- USB MCA Measurement Setup Commands: Name MMCA_SET_PRESET_NONE Description None preset Parameter - Results - Return Code see MMCA_RESET command Name MMCA_SET_PRESET_LIVE_TIME Description The command sets the time for measurement (dead time corrected).
Name MMCA_SET_ADC_RES_DISCR Description The command sets the ADC resolution and the software discriminator range. 1. Parameter Channels integer value 128, 256, 512, 1024, 2048 or 4096 2.
MCA 166- USB Name MMCA_SET_MCS_INPUT_ICR Description The command selects the count rate signal as MCS input. Parameter - Results - Return Code see MMCA_RESET command Name MMCA_SET_MCS_INPUT_TTL Description The command selects the external TTL signals as MCS input.
MCA Hardware Setup Commands: Name MMCA_SET_GAIN Description The command sets the amplifier coarse and fine gain. 1. Parameter Coarse gain integer value 2, 5 , 10, 20, 50, 100, 200, 500 or 1000 2.
MCA 166- USB Name MMCA_SET_THRESHOLD Description The command sets the analog threshold 1. Parameter Threshold integer value 2 ... 60 Results - Return Code see MMCA_RESET command Name MMCA_SET_SHAPING_TIME_LOW Description The command sets the amplifier shaping time (1µs).
Name MMCA_SET_FAST Description The command sets the fast discriminator threshold. 1. Parameter Threshold integer value 0 ... 2499, default 400 Results - Return Code see MMCA_RESET command Name MMCA_SET_SLOW Description The command sets the slow discriminator threshold.
MCA 166- USB MCA Stabilisation Commands: Name MMCA_SET_STABILISATION Description The command sets the peak stabilisation. 1. Parameter Stabilisation flag Integer value 0 turns stabilisation off 1 turn.
MCA Data Setup Commands: Name MMCA_SET_TDF Description The command sets the dead time correction parameter. 1. Parameter Tdf integer value 100 ... 3000, default 800 Results - Return Code see MMCA_RESET command Name MMCA_SET_USER_DATA Description The command stores a 32 bit value in the MCA parameter memory.
MCA 166- USB MCA Query Commands: Name MMCA_QUERY_USER_DATA Description The command reads 32 user data (32 bit values) from the MCA parameter memory. 1.
Byte Offset 64 1. ROI pair (ROI End) 25 Byte Offset 66 1. ROI pair (ROI Begin) Byte Offset 68 2. ... ... Byte Offset 120 15. Byte Offset 124 16. ROI pair Byte Offset 128 26 U235/UF6: I nspection descr.
MCA 166- USB Name MMCA_QUERY_POWER Description The command reads the MMCA power state. Parameter - Result array Battery current [mA] long value Byte Offset 4 HV primary current [mA] long value Byte Of.
Name MMCA_QUERY_STATE Description The command reads the MMCA state. Parameter - Results array MCA acquire mode MCA_MODE MODE_MCA, MODE_MCS Byte Offset 2 MCA preset MCA_PRESETS PRESET_NONE PRESET_REAL .
MCA 166- USB Name MMCA_QUERY_STATE STAB_IDLE, STAB_ERROR Byte Offset 72 Stab. ROI begin integer value Byte Offset 74 Stab. ROI end integer value Byte Offset 76 ADC input MCA_INPUT_ADC ADC_AMPLIFIER, A.
Name MMCA_QUERY_SYSTEM_DATA Description The command reads the MMCA system data. Parameter - Results array 0 integer Byte Offset 2 Peak detect counter 48 Bit integer Byte Offset 8 0 integer Byte Offset.
MCA 166- USB Byte Offset 116 Stabilisation area preset long Byte Offset 120 Stabilisation time preset integer value Byte Offset 122 Low shaping time 34 byte value Byte Offset 123 High shaping time 35 .
Name MMCA_QUERY_SPECTRA Description The command read the MMCA spectrum data. 1. Parameter No. of 1. Channel and read out control 37 integer value 2. Parameter Compress factor (1 ... 32) long value Result array Channel contents N long value Byte Offset 4 Channel contents N+1 long value .
MCA 166- USB Name MMCA_QUERY_UF6_INFO Description The command reads current dead time, real time the integral, begin and end of the UF6 ROIs Parameter - Result array Real time long value Byte Offset 4.
Name MMCA_QUERY_VOLTAGE_CURRENT Description The command reads the voltages and currents from the MMCA. Parameter - Results array Charger current [mA] long Byte Offset 4 HV primary current [mA] long By.
MCA 166- USB A P PENDIX 4 - Description of the MC A 16 6-USB firmware functions MCA Reset Command: Command name CMD_INIT Description All MCA Parameters will be reset to their initial state and the spectra are cleared.
MCA Mode Command: Command name CMD_SET_MODE Description Depending on the value of the first parameter (mod): MODE_MCA = 0 MODE_MCS = 1 the command set MMCA to the required mode by activating the previous specified setup parameter. The command will be ignored and responded with a error messages, if a measurement is still running.
MCA 166- USB MCA Measurement Setup Commands: Command name CMD_SET_ADC_RES_DISCR Description The command set the ADC resolution(res: 128, 256 … 4096), the LLD(Low level discriminator) and the ULD(Upper level discriminator) to the values of its three parameter.
Command name CMD_SET_REPEAT Description The command sets the number(rep: 0 ... 65535) of sweeps for repetitive measurement. Command syntax Format integer integer integer long integer Parameter preambl.
MCA 166- USB MCA Hardware Setup Commands: Command name CMD_SET_GAIN Description The command sets the amplifier coarse(cg) and fine gain(fg). cg: 2, 5, 10, 20, 50, 100, 200, 500 or 1000 fg: 5000 .
Command name CMD_SET_MCS_INPUT Description The command sets the input for the Multi-Channel Scaler. ip = 0 external TTL signals ip = 1 internal count rate signal ip = 2 counts only pulses with amplitu.
MCA 166- USB Command name CMD_SET_PUR Description The command sets the pile up rejection. Command syntax pur = 0 turns PUR off pur ≠ 0 turns PUR on Format integer integer integer long integer Parame.
Command name CMD_SET_PZC Description The command performs the Pole Zero Cancellation. pv: 0 ... 2499 PZC control voltage pm = 0 set PCZ only pm > 0 set PZC and measure PZC offset Command syntax For.
MCA 166- USB MCA Stabilisation Commands: Command name CMD_SET_STABILISATION Description The command sets the peak stabilisation. fl: 0 turns stabilisation off 1 turns stabilisation on rb+3<fl<re.
MCA Detector Power Commands: Command name CMD_SET_PREAMPLIFIER_POWER Description The command sets the preamplifier power(pp). 0X80 -24V on 0X40 +24V on 0X20 -12V on 0X10 +12V on 0XF0 all on 0X00 all o.
MCA 166- USB MCA Data Setup Commands: Command name CMD_SET_TDF Description The command sets the TDF parameter. tdf: TDF(100 ... 3000, default 800) Command syntax Format integer integer integer long in.
MCA Query Commands: Command name CMD_QUERY_POWER Description The command reads the power state. Command syntax Format integer integer integer long integer Parameter preamble command 0 0 end flag Byte String (HEX) A5 5A 59 00 00 00 00 00 00 00 B9 9B Results see MMCA_QUERY_POWER function in DLL description.
MCA 166- USB Command name CMD_QUERY_USER_DATA Description The command reads a 32 bit value from the MCA parameter memory. e: 0 ... 63 parameter number Command syntax Format integer integer integer lon.
Command name CMD_QUERY_ENRICHMENT Description The command read the integral of two ROIs and the real and dead time. pb: Peak 1 begin bb: Peak 2 begin pl: Peak 1 length (8 .
MCA 166- USB A P PENDIX 5 - Changing the MC A1 66- USB Firmware A t tention: The order of changing the swi tches must be followed exactly, otherwise the µ P will be destroyed! The programming voltage (+12V) shall only be applied when the working voltage (+5 V) is swi tched on !! Each MMCA must be programmed wi th it’s corresponding HEX-file (e.
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