Tektronix TDS 684A, TDS 744A, TDS 784A - page 245

Appendix B: Algorithms
TDS 684A, TDS 744A, & TDS 784A User Manual B–13
If all pairs straddle , use maxima. See Figure B–4.
The Burst Width measurement always uses both maxima and minima to
determine crossings.
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 B–4: Choosing Minima or Maxima to Use for Envelope Measurements