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 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
