Another measurement value is the average de of the com
bined ac and de portion of the waveform. This is obtained
in the DMM mode of operation with ac coupling and the
RMS pushbutton in the out position. This value for the
sample waveform is approximately 2 volts.
Time Duration
Make sure the HORIZ MGF VAR control is set to the cali
brated detent. Set the SEC/DIV control for at least a sin
gle event and position the display to place the time mea
surements points (see Fig. 13). Measure the horizontal
distance between the time measurement points and multi
ply the distance measured by the setting of the SEC/DIV
control.
EXAMPLE: The distance between the time measurement
points is 4 divisions and the SEC/DIV control is set to 2 m.
Using the formula:
Time Duration
=
horizontal
distance
(divisions)
Substituting: 4 x 2 m = 8 ms
X
SEC/DIV
setting
I
I
:
HORIZONTAL
:
1- DISTANCE-•
I
I
I
I
Fig. 13. Time duration between points on a waveform.
Periodic Signal Frequency
1480-6
The time-duration measurement can be used to determine
the frequency of a periodic signal. Measure the time-dura
tion of one event as described in Time-Duration Measure
ments and compute the reciprocal of the measurement to
determine the frequency.
@
213 Operators
23
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