Rise time measurements are made in the same manner as
time duration measurements, except the horizontal meas
urements are made between the 10% and 90% points of the
waveform amplitude. Rise time measurements are made as
follows:
1. Set the VOLTS/DIV and Variable control for a 5divi-
sion display.
2. Adjust vertical POSITION so that display bottom
crosses midpoint of the second division.
3. Measure horizontal distance (in divisions) between
the 10% and 90% points on the waveform (points A and B).
4. To find the rise time, multiple the horizontal distance
(in divisionsl by the SEC/DIV setting.
Figure 18. Example of rise time measurement.
REV A SEP 1979 305 Operators
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