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]
<mailto:[email protected]>> wrote:
Probably just shaky hands right when the camera snapped.
Josh Luthman
Office: 937-552-2340 <tel:937-552-2340>
Direct: 937-552-2343 <tel:937-552-2343>
1100 Wayne St
Suite 1337
Troy, OH 45373
On Mar 31, 2016 9:55 PM, "Jaime Solorza"
<[email protected] <mailto:[email protected]>> wrote:
OK I will get a new phone... but first suffer
On Mar 31, 2016 7:49 PM, "George Skorup" <[email protected]
<mailto:[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] <mailto:[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] <mailto:[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 <mailto:[email protected]>
*Sent:* Thursday, March 31, 2016 5:32 PM
*To:* [email protected] <mailto:[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 <mailto:[email protected]>
*Sent:* Thursday, March 31, 2016 3:24 PM
*To:* [email protected] <mailto:[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
