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Appendix B: Algorithms
Appendices
For details of the integration algorithm, see page A-19.
Delay
Timing measurement. The amount of time between the and
crossings of two different traces, or two different places on the same trace.
Delay measurements are actually a group of measurements. To get a specific
delay measurement, you must specify the target and reference crossing
polarities and the reference search direction.
= the time from one crossing on the source waveform to the
crossing on the second waveform.
Delay is not available in the Snapshot display.
Fall Time
Timing measurement. The time taken for the falling edge of a pulse to drop
from a value (default = 90%) to a value (default = 10%).
Figure A-2 shows a falling edge with the two crossings necessary to calculate
a Fall measurement.
1. Searching from to , find the first sample in the measurement
zone greater than .
2. From this sample, continue the search to find the first (negative) crossing
of . The time of this crossing is . (Use linear interpolation if
necessary.)
3. From , continue the search, looking for a crossing of . Update
if subsequent crossings are found. When a crossing
is found, it becomes . (Use linear interpolation if necessary.)
4. = –