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Appendix B: Algorithms
TDS 620A, 640A & 644A User Manual
AĆ11
For details of the integration algorithm, see page AĆ17.
Cycle Area
Amplitude (voltage) measurement. The area over one waveform cycle. For
nonĆcyclical data, you might prefer to use the Area measurement.
If StartCycle = EndCycle then return the (interpolated) value at StartCycle.
CycleMean=
ŕ
EndCycle
StartCycle
Waveform(t)dt
For details of the integration algorithm, see page AĆ17.
Burst Width
Timing measurement. The duration of a burst.
1. Find MCross1 on the waveform. This is MCrossStart.
2. Find the last MCross (begin the search at EndCycle and search toward
StartCycle). This is MCrossStop. This could be a different value from
MCross1.
3. Compute BurstWidth = MCrossStop - MCrossStart
Cycle Mean
Amplitude (voltage) measurement. The mean over one waveform cycle. For
nonĆcyclical data, you might prefer to use the Mean measurement.
If StartCycle = EndCycle then return the (interpolated) value at StartCycle.
CycleMean=
ŕ
EndCycle
StartCycle
Waveform(t)dt
(EndCycle * StartCycle) SampleInterval
For details of the integration algorithm, see page AĆ17.
Cycle RMS
The true Root Mean Square voltage over one cycle.
If StartCycle = EndCycle then CycleRMS = Waveform[Start].
Otherwise,
CycleRMS =
ŕ
EndCycle
StartCycle
(Waveform(t))
2
dt
(EndCycle * StartCycle) SampleInterval
Ǹ