HV = Opto-insulation ...
Hi, TK5
The best for that voltage levels ( !!! ) is to use a little shunt, an AOP and a V/F converter, then drive an opto-isolator or better an opto-fiber coupler ... remember only CNY21 like HV optocouplers are safe, here ...
on the other side Freq = Current, so it's easy for a PIC to display that !!!
Alain
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Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
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