PSI System Controls and Diagnostics
F3200E User Manual
F3200E_UM_180726 Page 45 of 107
bounded by the window, which is the maximum number of channels to include either side of the
peak channel.
Figure 27. Center of gravity calculation controls
In the following schematic illustration, a threshold of 20% and a window of 2 limits the
calculation to the yellow channels.
Figure 28. Limiting channels included in the peak position calculation.
11.7.2 Gaussian Fit (regression)
Channels for the fit are chosen in the same way as for the center of gravity calculation. A
Gaussian curve is fitted to the data by a weighted regression method. This method works well
where signal is spread over several channels, and it is relatively robust in the presence of noise.
A minimum of three channels are required in the fit. The Peak Threshold setting allows the fit to
be inhibited if the charge in the peak channel is below to the setting, to prevent spurious fits to
noise.
Figure 29. Gaussian regression fit control.
