To make time measurements automatically
You can measure the following time parameters with the oscilloscope:
frequency, period, duty cycle, positive and negative widths, rise time, and
fall time. The following exercise guides you through the time keys by making
a rise-time measurement. Steps for making other measurements are included
at the end of the procedure.
1
Connect a signal to the oscilloscope and obtain a stable display.
When the signal has a well-defined top and bottom, the rise time and fall time
measurements are made at the 10% and 90% levels. If the oscilloscope
cannot find a well-defined top or bottom, the maximum and minimum levels
are used to calculate the 10% and 90% points from. These levels are shown in
the section on making voltage measurements automatically.
The following figure shows a pulse with some time measurement points.
Pulse with Time Measurement Points
Figure 5-22
Making Measurements with HP 54645A/D Oscilloscopes
To make time measurements automatically
5-28
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