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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.
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.
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