On Tue, 2007-09-18 at 19:49 +1200, paul schulz wrote: > I've seen this where touching the metal shield on the outside of the > plug, i can feel 50Hz, and measure about 100volts open cct. The > scanner still worked though, and i put it down to a cheap power supply > in the scanner. As Rex says, it will ground itself through the pc. You > may start getting problems if the leakage is such that it starts to > trip any earth leakage cct breakers upstream from where you are.
Hmmmm. That might explain why the computer was resetting itself randomly when I had the scanner plugged in for a few hours before I noticed the sparking huh? :)
