I have a surplus TRIAD N-59M isolation transformer I'd like to install on my home test bench.
I was doing some sanity checks on it and came across some unexplainable (to me) AC voltages between the output and the frame.
First off I did resistance checks between between all connections and frame, and as expected only the primary and secondary windings show continuity with themselves. No continuity to the frame.
However when connected to mains with/without a load (light bulb), I read AC voltage between the output and the frame:
- Output term 1 reads 83VAC to frame
- Output term 2 reads 30vac to frame
I did not test if I could actually draw any current with these connections to the frame.
Should I consider the isolation transformer junk?