> > > That's pretty much standard these days. > > > > I don't understand the desire to connect two lines together because they > > 'seem' to be of the same magnitude. 0VDC is Not equal to Gnd > > Many systems will have multiple 5V power lines, heavy, light, designated. > > Do you want to link all those up too? > > > > Generally you want you power supply and logic nd safety grounds to be > separate. But at ONE and one one point would you connect them. > > What's happening here is that some "grounds" are carrying current exactly > equal to the power supply current and unless yu are using "super > conductor" > cable cool with liqi=ud helium there *will* be a non-zero voltage on the > "ground" cable. That is the problem with interconnected grounds, all > those return currents and by Ohm's law "return voltages". But if yu do > connect safety and return grounds at ONE point current can't flow. But > this is hard to do. Really hard if there are multiple 3-prong power plugs. >
And then there's impedance. That thick conductor that measure almost zero ohms with a meter compared to 0.5 ohms of the thin one suddenly has a very high impendence to high frequency noise bursts. So the high current spikes don't go through the thick but instead through the thin. John ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
