Sascha Pypke wrote:
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Use halleffedt current sens modules.
Or (Linear) Optocouplers ?
?!?

Sascha, do you mean 'hall effect', don't you?
These devices are useful to sense current, either AC or DC.

Another way to isolate is using transformers. Bandwith is
one of their issues... another is size, depending of how low
is the frequency to measure.

Txip.