<generator set up to drive a fast rise time buffer amp (so I can get a <reasonable amount of current) what else do I need to do to verify that I'v <successfully "flipped" the device. (My first guess would be a garden <variety compass) first you need a waveform that looks like this.... _____|-----|_____________ _______+I |_____| -I And put about one turn through the ferrite or steel under test. Then you'll need a second 1-2 turn loop hooked to the scope. You'll know the right waveform when the signal starts showing a huge amplitude difference as switches. Allison