Let me start by giving a little background info. I repair CNC machinery for a living. The other day I had a problem that required I know whether the 3 phase coming in to the machines main relay was dropping out or if the relay itself was dropping out first. It was a situation of which came first the chicken or the egg. I run into this type of problem on occasion, not enough to justify expensive test equipment so I'm looking for an inexpensive way of monitoring the voltages. I was thinking along the lines of a PIC to compare two voltages and let it determine which one went low first. My problem is how to convert the 3 phase to something the PIC can handle. Any advise from the experts here?
thanks
dan
thanks
dan
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