Nice - they are pretty fashionable, too. Win/win.
On Fri, Apr 1, 2016 at 3:37 PM, Ken Hohhof <[email protected]> wrote: > Maybe it means you need one of these: > > http://www.amazon.com/SCS-formerly-Static-Control-Economy/dp/B013J8CM6O/ref=sr_1_3?ie=UTF8&qid=1459539400&sr=8-3&keywords=esd+heel+strap > > > *From:* Josh Baird <[email protected]> > *Sent:* Friday, April 01, 2016 2:32 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Another ground question > > Well - today, I'm not seeing -any- voltage (from my digital multimeter) > between metal IN the enclosure. I have no idea why I did yesterday, > because nothing has changed. > > I do see a little bit of DC voltage when I hold the black lead in my hand > (lead touching my hands) and put the red lead on various metal pieces in my > enclosure. No idea why this is, but I don't think it's something I should > be concerned with, right? > > On Thu, Mar 31, 2016 at 6:44 PM, Ken Hohhof <[email protected]> wrote: > >> If the two pieces of metal are not connected together, like if one of >> them is floating except for stray high resistance paths to ground, then I >> wouldn’t pay much attention to the voltmeter reading. Especially if you >> are using a high impedance digital meter. >> >> Or if they are connected via a wire carrying high current, 0.1 volt may >> not mean much. If you have 10 amps flowing through a wire with 0.01 ohms >> resistance, there’s your 0.1 volt. >> >> If that second piece of metal is grounded to your common ground point >> with a wire that should not be carrying any current, then I might worry >> about the 0.1 volt. You might have a ground loop. >> >> Are you seeing a DC or AC voltage? >> >> >> *From:* George Skorup <[email protected]> >> *Sent:* Thursday, March 31, 2016 5:32 PM >> *To:* [email protected] >> *Subject:* Re: [AFMUG] Another ground question >> >> That's what i was going to say. If it's a cheap meter, don't worry about >> it. Bond everything and you should be fine. >> >> On 3/31/2016 5:27 PM, Chuck McCown wrote: >> >> Depends on the meter. Does the meter read 0.0 when the leads are shorted >> together? >> Some meters have some random fluctuations in the least significant digit >> all the time. >> >> *From:* Josh Baird <[email protected]> >> *Sent:* Thursday, March 31, 2016 3:24 PM >> *To:* [email protected] >> *Subject:* [AFMUG] Another ground question >> >> 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 >> >> >> >> >> >
