Question

Why do we not simply find the average of the sine wave on the oscilloscope screen...

Why do we not simply find the average of the sine wave on the oscilloscope screen when comparing to the value measured by a hand held multimeter (voltmeter)? Be sure to EXPLAIN what we are doing/calculating instead.

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Answer #1

Both Oscilloscope and Multimeter are similar piece of equipment but their uses vary. Oscilloscope displays a graph of voltage varying with time with voltage on the Y- axis and time on the X- axis while multimeter is used for make the precise measurement of electrical parameters such as voltage, current etc.

Now coming direct to the comparing the average value of oscilloscope sine wave with the value measured by multimeter of voltage do not displays the noise, distortion and spikes. So, if we are looking for anomalies like noise, distortion and spikes we have to go with the actual displayed sine wave output given by the oscilloscope. Multimeter can not give instantaneous value of the voltage while oscilloscope can give the voltage reading at any instant of time.

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