FAST ComTec MCA4A, User Manual

Page: 46 / 107

Software Description
For the MCS Inputs the Polarity can be selected between TTL and ECL (NIM) signals. For each of the MCS
inputs you can select between the rising and the falling edge. Usually for TTL signals, rising edge should be
active and for (negative) fast NIM signals “rising edge” should be deselected as the leading edge has the
better timing.
OK takes the settings and closes the dialog. Apply sets the parameters in the hardware without closing the
dialog. Cancel closes the dialog and cancels all changes.
The input thresholds can be set individually for each input. Click the “Thresholds...” button to open the
Thresholds dialog.
4.1.6 Presets
Clicking the Presets checkbox in the Settings dialog opens the ADC Presets dialog as shown in Fig. 4.10.
Here all preset parameters for PHA mode and SVA mode can be set. Select the ADC in the drop-down
listbox at top right. If the checkbox ROIpreset is marked, the measurement will be stopped after acquiring
more events than specified in the corresponding edit field. The Counts are events counted by the hardware
that trigger a pulse height analysis, whereas the ROI events are counted in the software if the corresponding
data in the spectrum are within the ROI
2 boundaries, i.e. >= the lower limit ROI min and < the upper limit ROI
max that can be defined in the ADC Settings dialog. Another possibility is to acquire data for a given run time
via the RTimepreset or a given live time via the LTimepreset. A measurement will be stopped if the
corresponding checkbox is marked.
2 ROI: Region Of Interest
46
F
ComTec GmbH
Fig. 4.9: ADC Presets Dialog
Fig. 4.8: Thresholds Dialog