MEASAR software
The software for the MEASAR measuring system is based on LabVIEW and runs under the operating system Windows NT and Windows XP. After installation, a PC or laptop can be connected to the MEASAR measuring system with a RS232 or USB interface. The following settings can be made and measuring routines called up to determine the CEM performance:
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Settings |
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Operating voltage of the channel electron multiplier at a constant bias-voltage between CEM output and anode. |
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Dead time of the preamplifier |
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Discriminator threshold |
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Length of measuring interval |
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Number of measuring intervals |
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Pause between measuring intervals |
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Protection |
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Setting overload protection |
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Setting ramp speed |
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CEM performance |
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Determining dark pulse rate |
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Measurements of Counts vs. applied voltage plots to determine optimal working point of the CEMs |
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Measurement |
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Setting of the measuring interval from 10 ms to infinity |
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Setting of repetition rate |
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Specification of a pause between measurements |
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Optional: external trigger input |
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Data recording |
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Graphic representation of all measuring channels in real time |
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Saving the measuring data as .txt file |
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After setting the high voltage, the discriminator threshold, the dead time of the preamplifier and, if necessary, an overload protection in the menu "Device", the length of the measuring intervals, the number of repetitions, and if a pause should be made between measurements or if measurement should continue upon an external trigger, can be specified in the menu.
In addition, the Counts vs. High voltage plot can be opened, from which the start and end voltage can be selected in advance and the increment size specified. A constant radiation source must be present, for example a vacuum measuring tube, like for the measurements in Fig. 4.
Film 1. The film shows the installation of the MEASAR software, operation of a MEASARsolo-S, the measurement of the counts vs applied voltage plot and counting of CEM output pulses |
While the measurement is running, the measurements can be shown in real time in an overview for all CEMs simultaneously (see Fig. 4), whereby the magnitude of the counter results on the y-axis are shown. Each diagram can be enlarged with a double click and saved in bmp format (Fig. 7). The measuring results are saved under "Save" as a .txt file and available for data evaluation with an evaluation program (such as SigmaPlot) using drag&drop.
| Fig. 7 Overview graphics can be enlarged with a double click |
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