Reply to thread

Hi,

If it was my task .. I´d go the scientific approach.

At first I need the hardware/ wiring setup, like this (wihtout knowing if this is realisitc:

Bare Hall sensor --> 100 unshielded twisted pair wire --> ADC

Then I´d need the maximum speed of change, like one full cycle in 0.5 seconds, plus the waveform (or at least a brief description)

Then I´d need the ADC sampling rate

*****

If sampling rate really is "every few seconds" then for sure I´d install an analog filter that satisfies nyquist. Because: if there is unknown noise, then (without the nyquist filter) you get alias frequencies. And you have zero chance on the digitial side to remove these "alias frequencies" because you can´t differentiate them from the true signals.

My approach would be to use an analog filter  --> ADC (with higher sampling rate) --> adjustable (maybe adaptive) digital filter.

Klaus