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Appendix B: Algorithms
TDS 684A, TDS 744A, & TDS 784A User Manual
B–11
2. From this sample, continue the search to find the first (positive) crossing of
LowRef. The time of this crossing is the low rise time or TLR. (Use linear
interpolation if necessary.)
3. From TLR, continue the search, looking for a crossing of HighRef. Update
TLR if subsequent LowRef crossings are found. If a HighRef crossing is
found, it becomes the high rise time or THR. (Use linear interpolation if
necessary.)
4. RiseTime = THR – TLR
High
HighRef
LowRef
Low
THRTLR
Rise Time
Figure B–3: Rise Time
Amplitude (voltage) measurement. The true Root Mean Square voltage.
If Start = End then RMS = the (interpolated) value at Waveform[Start].
Otherwise,
RMS =
ŕ
End
Start
Ă(Waveform(t))
2
dt
(End * Start) SampleInterval
Ǹ
For details of the integration algorithm, see below.
RMS: