Rise time measurements are made in the same manner as
tim e duration measurements, except the horizontal meas
urements are made between the 10% and 90% points o f the
waveform amplitude. Rise time measurements are made as
follows:
1.
Set the V O LTS /D IV and Variable control for a 5 d ivi-
sion display.
2.
Adjust vertical POSITION so that display bottom
crosses m idpoint o f 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, m ultiple the horizontal distance
(in divisionsl by the SEC/DIV setting.
Figure 18. Example of rise time measurement.
REV A SEP 1979
305 Operators
31
