Hi Max YouAsked <<Does anyone know of a good method (or have any ideas) of how I could reduce line voltage down to low (DC) levels in order to measure the line voltage with an AD converter.>>
Why not just use a precision voltage divider, and then feed the reduced ac voltage to your A/D. If you need only positve voltage, then couple into the A/D with a capacitor and add a precise DC offset voltage. <<Using a transformer is obviously the easiest way and probably provides the least potential problems with safety agencies. But transformers are not (I don't think) terribly accurate and they are rather bulky even in this sort of application.>> Probably not the best way to do it! <<What are the safety implications, for example, of just rectifying and filtering the voltage and running it through a voltage divider?>> I am not a safety engineer however, I wouldn't think this is any less safe than using this same method for normal dc voltage supply! Many TV receivers use this basic idea for their supplies! But this method for your requirement is more costly than above. Regards Tony O'Hara Sales Engineer Technical Marketing Co
