3.
Measure
the horizontal distance between the time-
measurement points.
4. Calculate time duration, using the following formula:
horizontal
distance X
(divisions)
TIME/DIV
switch
setting
Time
Duration
magnification
EXAMPLE:
The distance between the time-measurement
points
is
8.3 divisions
(see
Figure 18), and the TIME/DIV
switch
is
set to 2
ms.
No
magnification
is
used.
Substitute the
given
values:
D
Timt.e
= 8.3 div X 2 ms/div = 16.6
ms
ura
1on
FREQUENCY
The frequency of a recurrent
signal
can
be
determined
from its time duration measurement
as
follows:
1.
Measure the time duration of one waveform cycle
using the preceding Time Duration measurement
procedure.
2. Calculate the reciprocal of the time duration value
to
determine the frequency of the waveform.
EXAMPLE: The
signal
shown
in
Figure 18
has
a time
duration of
16.6 milliseconds.
Calculating the reciprocal of time duration:
1
Frequency = . . =
t1me
duration
16.6
ms
RISE TIME
=60Hz
Rise
time measurements
use
the same methods
as
time
duration, except that the measurements are made between
the
10% and 90% points on the leading edge of the
wave-
form
(see
Figure 19).
Fall
time
is
measured between the
90% and 10% points on the trailing edge of the waveform.
48
465B/DM44
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