Figure
9
Operating
Your
Oscilloscope
To
•ake
tl•a
•easure•a•ts
auto•atlcally
To
make
time
measurements
automatically
You
can measure the following time parameters with the oscilloscope:
frequency, period, duty cycle, width, rise time, and
fall
time. The
following
exercise
guides you through the Time keys
by
making a rise
time measurement. Figure 9 shows a pulse with some of the time
measurement points.
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 arc
shown
on page 37 in figures
11
and
12.
RIS!:TIMt
FALL
TIME
l-oll---
+WIDTH
__
.....,..
___
-wiDTH
--~
34
90:';
50';
'-'
\_.1
\_.1
\_.1
\_.1
\.._)
..._,
..._,
-....;
v
'-'
'-'
'-'
'-'
\..__/
..._,
'-'
'-'
"'-'
v
'-'
v
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