You should really consider measuring the voltage difference before
correcting it...  :-)

My electronics teacher would, every so often, disconnect the cable from
the TV in hte classroom and measure the ground to ground voltage and
current.  More than once he measured enough of a difference to put out a
memo about teachers clipping off the ground terminal of extension cords,
then plugging them in backwards so the neutral (which some TV sets would
couple to chassis ground, and then couple to the cable system ground)
was hot, and hot neutral.

Cable company doesn't like it either...

-Adam

Harold Hallikainen wrote:

>Years ago, I was working on a telemetry system at a broadcast transmitter
>site. The equipment was in a rack beside the 5kW AM transmitter. The
>sample from the transmitter was ground referenced. I put a clip lead
>between the ground side of the sample and the rack cabinet the telemetry
>equipment was in. The clip lead melted....
>
>Harold
>
>
>
>>Probably, all you need to induce this noise is a cliplead between the two
>>system grounds.
>>If so, there's current flowing between the two systems.
>>
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