On 04/08/2017 07:09 PM, Gene Heskett wrote: > On Saturday 08 April 2017 19:42:26 Jon Elson wrote: > >> On 04/08/2017 01:51 PM, Gene Heskett wrote: >>> I need to go to tsc or somewhere, wallies maybe, and get >>> me some of those 3 to 2 electrical adaptors as I just >>> found my gigahertz sampler scopes 3rd wire ground pin is >>> .2 ohms from a damned probe ground lead, so just hooking >>> up a ground lead is making a ground loop. I may even just >>> uncover the darned thing and see if I can find the jumper >>> and cut it. What the hell were they thinking? >> The problem with that is they used to have line filters with >> huge caps to line and neutral, and you'd get knocked on your >> rear if you touched a scope with an isolated ground and >> anything else. You could even get sparks off the ground clip. >> Not sure your current scope has such a filter, but if so, >> beware when using it isolated. >> >> Jon >> > That consideration has indeed crossed my mind, Jon, so before I make it > permanent, that will be checked. Those honking big line bypass caps > have tossed me around a bit in the last 70 years. Not the most pleasant > feeling... > > On the lcnc joint errors front, I unplugged the cat-6 and hdmi video to > the monitor cables, pulled them out of the holes in the bottom of the > box, and took them back to the pi from an overhead direction, putting > 15" of air between the cables and the noise from the stepper drivers. > It had, the last time I checked 15 minutes back, made 45 copies of > lathe_pawn.ngc w/o a joint error. So I guess I go prowling about fleabay > for a separate box to put whats now on the inside of the door in this > too small a box. If I close the door, the whole maryann will be too > close to the noisemakers. > > Yup, the noise produced by unfiltered stepper drives (or PWM servo drives) is a major problem. VFDs, too, of course.
Jon ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
