X-Stream Operator’s Manual
WM-OM-E Rev I 161
waveforms an acquisition occurs for each segment and a sweep is equivalent to acquisitions for all
segments. Only the section of a waveform between the parameter cursors is used in the calculation
of parameter values and corresponding histogram events.
The following table provides a summary of the number of histogram events captured per acquisition
or sweep for each parameter, and for a waveform section between the parameter cursors.
Parameters Number of Events Captured
duty, freq, period, width, time@lev, f@level,
f80-20%, fall, r@level, r20-80%, rise
All events in the acquisition
ampl, area, base, cmean, cmedian, crms, csdev,
cycles, delay, maximum, mean, minimum, nbph,
nbpw, over+, over-, pkpk, npts, rms, sdev, dly
One event per acquisition
Histogram Parameters (XMAP and JTA2 Options)
Once a histogram is defined and generated, measurements can be performed on the histogram
itself. Typical of these are the histogram's
• average value, standard deviation
• most common value (parameter value of highest count bin)
• leftmost bin position (representing the lowest measured waveform parameter value)
• rightmost bin (representing the highest measured waveform parameter value)
Histogram parameters are provided to enable these measurements. Available through selecting
"Statistics" from the "Category" menu, they are calculated for the selected section between the
parameter cursors:
fwhm full width (of largest peak) at half the maximum bin
fwxx full width (of largest peak) at xx% the maximum bin
hist ampl histogram amplitude between two largest peaks
hist base histogram base or leftmost of two largest peaks
hist max value of the highest (right-most) populated bin in a histogram
hist mean average or mean value of data in the histogram
hist median value of the x-axis of a histogram that divides the population into two equal halves
hist min value of the lowest (left-most) populated bin in a histogram
hist rms rms value of data in histogram
hist sdev standard deviation of values in a histogram
hist top histogram top or rightmost of two largest peaks
max populate population of most populated bin in histogram
mode data value of most populated bin in histogram
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