If ya coulda just waited another month, this would be a ten year thread resurrection. Oh well. It'll happen sooner or later!
On December 21, 2017 at 19:27, Grasshopper said...
Perhaps you're the guy to answer this question. Might seem dumb, but if ya don't know, ask somebody, right?
It's possible that voltage has gotten onto some water pipes at an installation we did, causing a proplem with one of our pieces of equipment. Would I just put a lead on the pipe and the other on the ground on the water heater? If I wanted to check for voltage on the ground, what would I put my other lead on? Just anything else that is grounded? Thanks.
The earlier discussion involved analog video where ground currents produce horizontal bars that slowly roll up the image. I haven't seen that kind of result from hum in digital TVs, and it's hard to believe hum just doesn't exist any more -- it's more believable that the manner in which digital displays make their images make them less susceptible to hum.
What are you seeing that makes you think there's hum?
What do you know that makes you point to water pipes?
In other words, examine all you know before going off to find out what you don't know.
Do what I suggested in the earlier post.
Also, add a ground. Connect a wire to some place in your system, say AVR chassis ground (NOT a signal ground) and touch it to different ground places, including at least local power socket ground lead and a water pipe or two. After you've done that, come back here and tell us what you've found.
