HP 54645A User's And Service Manual page 171

Making Measurements with HP 54645A/D Oscilloscopes
To make time measurements automatically
Press the
4
The oscilloscope automatically measures the rise time of the signal and
displays the result on the display.
The following figure shows how to use delayed sweep to isolate an edge for a
rise-time measurement.
Figure 5-23
Isolating Edge for Rise-Time Measurement
To measure the fall time, press the
5
5-30
Rise Time softkey.
Automatic Measurements
The oscilloscope makes automatic measurements on the first displayed event.
Rise Time and Fall Time Measurements
Rise-time and fall-time measurements do not work on digital channels on
HP 54645D.
Fall Time softkey.