1. An oscilloscope shows a steady sinusoidal signal of 5 Volt peak to peak, whic
ID: 1317993 • Letter: 1
Question
1. An oscilloscope shows a steady sinusoidal signal of 5 Volt peak to peak, which spans 5 cm in vertical direction on the screen. By tweaking the time sweep, the periodic saw-tooth voltage of the oscilloscope is replaced by voltage signal identical to the one that is detected. What will be observed on the oscilloscope screen?
2. On a 20 MHz oscilloscope as those used in class, the knob of the time sweep rate shows for the fastest setting the mark of 0.2 microseconds per major division in horizontal direction on the screen. How many full periods of a 5 MHz periodic signal will be observed in one major horizontal division?
Explanation / Answer
1.
instead of using the time base saw tooth to drive the horizontal deflection, you use an external sinusoidal input signal to drive the horizontal deflection then the result would be a diagonal line on the screen
2.
T = 1/f =1/50MHz= 0.2 microseconds
Therefore there will be exactly ONE of these waves visible in a 0.2 microsecond division
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