GBS Elektronik MCA-527 How to do an optimum setup - Manual (Page 4)

Signal is permanently out of range, here much to positive. Try smaller coarse gain. Significant offset can be a
sign of a degrading detector with leakage currents. Up to 100mV may be acceptable. Very high offsets may be a
sign of a defective preamplifier or detector, also a warm HPGe would exhibit such a behavior.
Without any signal or even with extreme DC Offset, it is useless to try a setup, rather there should be
troubleshooting on the detector.
Signal rise time, Flattop setting
Next setting to be adjusted is the Flat top setting, which corresponds to the rise of the preamplifier signal. The
purpose of this is to exclude the rise part of the signal from evaluation as this would only add error to the
amplitude evaluation.