7 An oscilloscope displays the trace below when the gain is

7. An oscilloscope displays the trace below when the gain is set at 15 V/div and the time/div setting is set at 5 ms/div. Find the peak-to-peak voltage and frequency of the input signal.

A) 90 V, 49 Hz

B) 45 V, 50 Hz

C) 100 V, 50 kHz

Solution

Ans) Peak to Peak Voltage V=6 divisions*15 V/div=90 V

V=90 V

Time period=4 divisions*5ms/div=20 ms

Frequency=1/time period=1/20m=50 Hz

F=50 Hz approximate it to 49 Hz as time period is slightly less than 4 divisions

So Ans isA i.e 90 V,49 Hz