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[EXAMPLE]
For the example, the horizontal distance between the two points is 5.4 divisions.
If the SWEEP TIME/DIV is 0.2 ms/div we calculate. (See Fig. 13)
Substituting the given value:
Time = 5.4 (div) x 0.2 (ms/div) = 1.08 ms
FREQUENCY MEASUREMENTS
Frequency measurements are made by measuring the period of one cycle of waveform
and taking the reciprocal of this time value as the frequency.
Procedure:
1. Set the oscilloscope up to display one cycle of waveform (one period).
2. The frequency is the reciprocal of the period measured.
Using the formula:
[EXAMPLE]
A period of 40 /is is observed and measured. (See Fig. 14)
Substituting the given value:
Freq=1/[40x10"
6
] = 2 . 5 x 1 0
While the above method relies on the measurement directly of the period of one cycle,
the frequency may also be measured by counting the number of cycles present in a given
time period.
1. Apply the signal to the INPUT jack. Set the vertical MODE to the channel to be used
and adjusting the various controls for a normal display. Set the VARIABLE to CAL.
24
1
Freq = p
j
|
e r
Q C
1 c y c l e = 4 0 /ts ( 5 / t s / d i v . x 8 d i v . )
Fig. 14
4
= 25 kHz
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