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Appendix B: Algorithms
TDS 620A, 640A & 644A User Manual
AĆ19
If some samples in the waveform are missing or offĆscale, 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 measureĆ
ment record will be assumed to have the value of the nearest known samĆ
ple.
When samples are out of range, the measurement will give a warning to that
effect (for example, CLIPPING") if the measurement could change by
extending 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 AĆ4:ăChoosing Minima or Maxima
to Use for Envelope Measurements
Missing or
OutĆofĆRange
Samples