On Monday, October 17, 2011 11:46:15 PM Bruce Klawiter did opine: > >> Well I hope it is solved and I don't even know how I did it. > > > >OHHHhhh NOOooooo! That's the worst kind, as it can come BACK! > > I know, I spent the rest of the day trying to get the twitching to come > back so I would know what the problem was, but I can't. > > >Well, this is NOT OK! .1 V AC on the minus power supply to the op > >amps in the servo amp is a real problem. And, it isn't your meter, > >as the + side is reading .001, which is fine. > > Well then I will have to find a new power supply. > > >Yes, the DAC outputs have a signal pin and a ground pin. > >The encoder board also has a ground pin for each encoder. > > With only the encoders plugged into the PPMC boards the D-sub > connector does not show ground. > OK let make sure I am saying this right with only the encoder > plugged in and my meter set to ohms, one lead on the D-sub > connector and on on the chassis it shows an open circuit. If I plug > in the amp to the DAC or the parallel cable my meter shows a dead short. > Not that this helps of changes anything I just want to make sure I > am explaining it rigth
I would go to the far end of this cable and opern up the dsub shell and break the connection there. It is making a ground loop. > Would there be any benefit to moving all the grounds to one one point, > this would be fairly easy to do. I would certainly try it. I have had no problems, but that is how I have always done it. With my 60 years of chasing electrons for a living, that is a lesson I learned about the first time I ever built an audio amplifier at about 15 YO. A Williamson circuit, using KT-66 vacuum tubes. > Thanks Jon and everyone else for the help > ------------------------------------------------------------------------ > ------ All the data continuously generated in your IT infrastructure > contains a definitive record of customers, application performance, > security threats, fraudulent activity and more. Splunk takes this data > and makes sense of it. Business sense. IT sense. Common sense. > http://p.sf.net/sfu/splunk-d2d-oct > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Classical music is the kind we keep thinking will turn into a tune. -- Kin Hubbard, "Abe Martin's Sayings" ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2d-oct _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
