# Measurements

### Explanation of question 25

An oscilloscope is displaying several cycles of a sine wave. To display just one cycle, adjustment should be made to the control marked

1. X-shift
2. timebase (time/cm)
3. vertical amplifier (V/cm)
4. trigger level

The answer is :- 2 Adjustment of the time base is required, which controls the speed of the ‘spot’ across the screen.

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