Livetime is the total amount of time during which the pulse processor has not rejected pulses due to pileup. Please review Tech Support Note 2000-1 for more detailed information, including how the deadtime is calculated. The number of channels and the eV per channel settings, as well as other characteristics of the EDS probe acquisition, depend on the selections made in the X-Ray Probe Prefs . The preview spectrum window will clear its counts to zero and restart after the amount of time specified in the Preview Dwell field of the X-Ray Probe Prefs panel. By setting that time to only a few seconds, the preview window becomes a convenient way to observe a changing spectrum such as when calibrating or deciding which area of the sample to probe.
User sets the current count as the full scale value of the counts axis.
Each number value sets the full scale value of the counts axis. While holding the mouse button down, drag the spectrum left or right. If an active probe preview is in progress, the ROI for that element will immediately appear on screen. To see or change individual ROI settings, shift-click on the element of choice. Default values are supplied for most elements.