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Appendix B: Algorithms
TDS 620A, 640A, & 644A User Manual
If some samples in the waveform are missing or off-scale, the measurements
will linearly interpolate between known samples to make an “appropriate”
guess as to the sample value. Missing samples at the ends of the measure-
ment record will be assumed to have the value of the nearest known sample.
When samples are out of range, the measurement will give a warning to that
effect (for example, “CLIPPING”) if the measurement could change by ex-
tending the measurement range slightly. The algorithms assume the samples
recover from an overdrive condition instantaneously.
MidRef
Both min and max
samples are above
MidRef, so use
minima.
MidRef
Both min and max
samples are below
MidRef, so use
maxima.
Figure A-4: Choosing Minima or Maxima
to Use for Envelope Measurements
Missing or
Out-of-Range
Samples