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Appendix B: Algorithms
Appendices
AĆ12
For details of the integration algorithm, see page AĆ17.
Delay
Timing measurement. The amount of time between the MidRef and Mid2Ref
crossings of two different traces, or two different places on the same trace.
Delay measurements are actually a group of measurements. To get a specifĆ
ic delay measurement, you must specify the target and reference crossing
polarities and the reference search direction.
Delay = the time from one MidRef crossing on the source waveform to
the Mid2Ref 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 HighRef value (default = 90%) to a LowRef value (default = 10%).
Figure AĆ2 shows a falling edge with the two crossings necessary to calcuĆ
late a Fall measurement.
1. Searching from Start to End, find the first sample in the measurement
zone greater than HighRef.
2. From this sample, continue the search to find the first (negative) crossĆ
ing of HighRef. The time of this crossing is THF. (Use linear interpolation
if necessary.)
3. From THF, continue the search, looking for a crossing of LowRef. UpĆ
date THF if subsequent HighRef crossings are found. When a LowRef
crossing is found, it becomes TLF. (Use linear interpolation if necesĆ
sary.)
4. FallTime = TLF - THF