> I am looking for an isolated method of measuring mains 
> voltage (230VAC).
> 
> First thoughts are a Opto coupler running in its linear region ?
> My concerns are that the transfer ratio degrades over time.

Do the measuring at the HV side and transfer a digital signal via an
optocoupler.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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