Night all...woke up at 4 am...long day On Mar 31, 2016 8:28 PM, "Josh Luthman" <[email protected]> wrote:
> What?! Speak louder I'm deaf in one eye. > > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > On Mar 31, 2016 10:13 PM, "George Skorup" <[email protected]> wrote: > >> You're getting old-timers disease. >> >> On 3/31/2016 9:04 PM, Jaime Solorza wrote: >> >> Oh so I am old now. Thanks >> On Mar 31, 2016 7:59 PM, "Josh Luthman" <[email protected]> >> wrote: >> >>> Probably just shaky hands right when the camera snapped. >>> >>> Josh Luthman >>> Office: 937-552-2340 >>> Direct: 937-552-2343 >>> 1100 Wayne St >>> Suite 1337 >>> Troy, OH 45373 >>> On Mar 31, 2016 9:55 PM, "Jaime Solorza" <[email protected]> >>> wrote: >>> >>>> OK I will get a new phone... but first suffer >>>> On Mar 31, 2016 7:49 PM, "George Skorup" <[email protected]> wrote: >>>> >>>>> Dude, get a new phone, my eyes hurt now. Sorry, just being honest. >>>>> >>>>> On 3/31/2016 8:31 PM, Jaime Solorza wrote: >>>>> >>>>> We do isolate them... >>>>> On Mar 31, 2016 7:11 PM, "Adam Moffett" <[email protected]> wrote: >>>>> >>>>> Do you need to? We want them all to go to the earth eventually right? >>>>> >>>>> >>>>> On 3/31/2016 7:38 PM, Jaime Solorza wrote: >>>>> >>>>> Are you isolating your DC and AC grounds? >>>>> On Mar 31, 2016 4:44 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 >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>> >>>>> >>
