Sampling and averaging

[Bgmnt]

@CrossRulz

The actual sampling frequency of the acquired signal is 2kHz . Even the the poteiometer signal shows a peak at around 200Hz. But what i fail to understand is that why this frequency is obbserved even though THERE IS NO MOVEMENT IN THE POTENTIOMETER. It is still and rests at a support.

Then why is this frequency coming?

[crossrulz]

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@Bgmnt wrote:

Then why is this frequency coming?

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What else do you have in the room?  Motors?  Florescent lights?  Signal Generators?  etc.  There are many things that can couple onto your signal, especially in industrial settings.

[Bgmnt]

Just the AC.