Propeller Head Plaza

Technical and scientific discussion of amps, cables and other topics.

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Not sure but...

Posted by Lee of Omaha on July 13, 2011 at 14:10:58:
Terminal 3 is almost certainly the wiper, so it will be one of the outputs. Suggest you use a signal generator or bell transformer (10 volt output) or the 6V or 5V winding of a power transformer you have laying around as a low voltage source and safely determine the relationships among the terminals.

And remember that a variac is NOT an isolation transformer--the output still has a DC path to ground.