Yeah, something metal in the enclosure. Well, there could be a path between the ground in the enclosure and the electrical/AC ground, but I'm still seeing the 0.1v even with the electrical/AC ground disconnected.
On Thu, Mar 31, 2016 at 6:02 PM, Adam Moffett <[email protected]> wrote: > "something metal" in the enclosure, or something metal that is separate? > > If the "something metal" was like an electrical conduit or something else > that has it's own path to ground, there could be a path between the ground > in your enclosure to the other separately grounded item that goes all the > way through your building to the electric panel. A 0.1v potential > difference between the two might be normal. > > If you're measuring 0.1v between two points in your enclosure then yeah > that's weird. > > > On 3/31/2016 5:24 PM, Josh Baird wrote: > >> I'm working on a new DC enclosure (steel 19" rackmount cabinet). When >> using a DC volt meter, and putting the 'red' lead on a common ground point >> (my ground bus, a metal rack rail, etc), and the 'black' lead on something >> metal, I'm seeing ~0.1V. >> >> I'm assuming this is bad. On the bench currently, I have the AC ground >> connected to my PSU. I have all other devices (switch, surge suppressors, >> rack rails, etc) tied to a common ground that isn't yet connected to >> earth. My PSU and power distribution is on a metal DIN rail which in turn >> is mounted to the metal rack rails. >> >> Should I be concerned with this? As much as I try (or not), I still have >> trouble wrapping my head around ground/ground potential/etc. >> >> Josh >> >> >> >
