On Tuesday 04 August 2020 09:09:38 andy pugh wrote: > On Tue, 4 Aug 2020 at 14:03, Matthew Herd <herd.m...@gmail.com> wrote: > > I am guessing that the source of the trouble is probably the VFD, as > > 80kHz seems like a plausible base frequency for driving an AC motor. > > Add an input filter to the VFD. They are not expensive. Look on eBay > for "Rasmi" (one manufacturer, but a good search term)
Or on this side of the pond, CorCom make's both a single phase and a 3 phase filter thats a brick wall above 30 mhz, I have one on both sides of the vfd on the Sheldon. I can see the vfd, but its under 200 millivolts all the way to the scopes 100+ megahertz bandwidth. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
