Spectrum Techniques ICS-PCI, User Manual

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12
High Voltage and Amplifier Gain
Once the program is running it will be necessary to configure the system parameters for correct operation and calibration.
Connect a working compatible detector to the card and place a gamma emitting check source near the detector face.
Cesium-137 (Cs-137) is a good choice. It has major peak at 662 keV.
Click on Settings, then click on AMP/HV. Set the high voltage to the voltage as listed by the detector manufacturer.
As an example, set the high voltage to 600 volts, click ON.
DO NOT exceed the maximum high voltage rating of the detector, usually 1200 volts.
Set the amplifier COARSE GAIN to 2, and set the FINE GAIN to 1 as a starting position.
Click on OK , to set adjustments and exit the menu.
Start the data acquisition and adjust the amplifier gain up or down until the 662 keV peak is approximately mid-scale.
Once the acquisition is started, you may enter the AMP/HV menu, make adjustments while viewing the spectrum.
This will allow you to position the peak in the desired channels.