Applications
Rise
Time
and Fall
Time
Using Parametric Measurements
To measure rise or fail times with the Parametric Measurements feature:
1.
Push the MEASURE button.
2.
Select from the menu either RISE-t for rise times or FALL-t for
faii times.
The oscilloscope will automatically scale the amplitude and timing for the
best measurement. The measurement results will be displayed once each time
the measurement is selected.
If rise or fall time measurements are desired between points other than the
10%
and 90% points, use the TIME measurement as described in Section 2.
Signals that have relatively slow transitions at the 10% or 90% points with a
fast transition between the 10% and 90% points can give erratic measurement
results using RISE-t or FALL-t.
Without Parametric Measurements
or for
Maximum Accuracy
1.
Set VOLTS/DIV, VAR, and POSITION to align the bottom of the
waveform with the 0% graticule line and the top with the 100% line.
2.
Set Trigger SLOPE to + for rise time or to — for fall time.
3. Set SEC/DIV and. if necessary, X10 MAG to spread the transition over
as wide a span as possible.
4.
Turn on At and align the cursors with the points where the transition
intersects the 10% and 90% graticule lines.
For best accuracy, observe the considerations given in the Signal
Connection parts of the "Operation" section and be sure TRACE ROTATION is
set correctly, as described in the "Checks and Adjustments" section.
2465B/2455B/2445B Operators
3-9
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