Waveform Measurements
The Waveform Measurement Process
If there are not enough points on an edge, the measurement is either not
made or is agged as questionable.
The instrument scans the waveform data and records the transitions through
the three thresholds. If a waveform data point does not exactly correspond
to the threshold level value, the system interpolates between the two points
about the threshold. Then the location of the transition point is recorded
in an edge array. The system ignores incomplete transitions and glitches as
shown in Figure 7-7.
Figure 7-7. The system ignores incomplete transitions when dening edges.
The instrument denes the points on a rising edge as the last point before
crossing the lower threshold to the rst point crossing the upper threshold.
The
points
on
a falling
edge
include
the
last
point
before
crossing
the
upper
threshold
to
the
rst point
crossing
the
lower
threshold.
This
will
measure
the
fastest
rise
and
fall
times
.
7-12
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