Elenco 30MHz Dual Trace - Manual (Page 54)

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APPLICATION
For the example shown in Fig.9, the horizontal distance between the two points is
5.4 divisions. If the TIME/DIV is 0.2 ms and X10 magnification is not used, the time
period is calculated as follows:
Time = 5.4 (div) x 0.2 (ms/div) = 1.08 ms
FREQUENCY MEASUREMENTS
Method No.1
(Refer to Fig.10)
Frequency measurements are made by measuring the time period of one cycle of
waveform and calculating the frequency, witch equals the reciprocal of the time
period.
1. Set up the oscilloscope to display one cycle of waveform (see Fig.10).
2. Measure the time period of one cycle and calculate the frequency as follows:
Freq = 1/Period
In the example shown in Fig.15, a period of 40 μ s is observed. Substituting this
value into the above equation, the frequency is calculated as follows:
Freq = = 2.5 x 14 = 25 kHz
1
4
40 x 16 -6
100
90
10
0
1 cycle=40 S/div x 8 div) μ
Fig.10 Frequency Measurement