Choose the system metric first: absolute phase, phase matching between channels, electrical length, group delay or time delay. State the frequency points, baseline condition and whether the limit is total change, peak-to-peak movement or repeatability after the cable returns to one position.
For flexure, define bend radius, bend angle, movement plane, travel, torsion, speed, cycle count, dwell and connector restraint. For temperature, define range, ramp, soak, measurement state and recovery. Test the mechanisms separately before applying a combined mission sequence.
Retain complex S-parameters and the serialized baseline, then compare post-stress data at identical reference planes. Connector remate variation should be measured independently so it is not misreported as cable-body phase instability.