Update Qspice to the latest version with the derivative function problem fixed.
02/11/2025 Fixed a problem evaluating derivatives in .meas statements.
The derivative in the B-source is ddt(x), but in the waveform viewer or post-processing (.meas), it is represented as D(x). For more details, go to Help, Waveform Viewer > Waveform Expressions.
Here is the answer to your question on how to locate that point from .meas.
Steady with derivative (.meas).qsch (2.3 KB)
