I didn't test the isolation. I wanted to avoid accidentally destroying the chip, since that would mess up the analysis. I was tempted to hook the chip up to the 40 kV spark generator we had sitting around, but that would probably be a bad idea.
Probably the package would need to be over 1cm tall to withstand that.
(I think that the electric power guys get "30kV/cm" etched into their brains - the field strength at which sparks start to fly between conductors separated by air.)
