Tektronix TLS 216 User Manual page 281

Appendix B: Algorithms
Missing or Out-of-Range Samples
B–16
MidRef
MidRef
Figure B–7: Choosing Minima or Maxima to Use for Envelope Measurements
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 measurement 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
extending the measurement range slightly. The algorithms assume the samples
recover from an overdrive condition instantaneously.
Both min and max
samples are above
MidRef, so use minima.
Both min and max
samples are below
MidRef, so use maxima.
TLS 216 User Manual