Thanks, Don!
That's exactly the kind of clue I was hoping for.? You're right, I did not control the polarity of the last cycle before turn-off.? So my statement about invariable remanence is not correct.? Remanance could have two quantities, A and B.? I can't control which one it is, but I should be able to record which one it is in a future experiment.? I'll try this again by noting the last cycle polarity and the off time before each measurement in a new session.? I might also try to set the remanence by applying some DC to the transformer prior to energizing.
I haven't found anything about remanence decay time, but I imagine it's quite long because once you magnetize a piece of steel, it stays that way for a long time.?
Cheers,
Halden VE7UTS
