D–12
Appendix D
Parameter and what it does Definition Notes
top
Higher of two most probable states, the lower
being base. This is characteristic of rectangular
waveforms and represents the higher most
probable state determined from the statistical
distribution of data point values in the waveform.
Value of most
probable higher
state
(See Fig. D–1)
Gives similar result when
applied to time domain
waveform or histogram of data
of same waveform. But with
histograms, result may include
contributions from more than
one acquisition.
width
Width of cyclic signal determined by
examining 50 % crossings in data input. If first
transmission after left cursor is a rising edge,
waveform is considered to consist of positive
pulses and width the time between adjacent
rising and falling edges. Conversely, if falling
edge, pulses are considered negative and
width the time between adjacent falling and
rising edges. For both cases, widths of all
waveform pulses averaged for final result.
Width of first
positive or
negative pulse
averaged for all
similar pulses
(See Figs. 1, 2)
Similar to fwhm, which,
however, applies only to
histograms.
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