On 03/15/2011 11:18 AM, Peter C. Wallace wrote: > On Tue, 15 Mar 2011, Kirk Wallace wrote: > >> Date: Tue, 15 Mar 2011 11:16:18 -0700 >> From: Kirk Wallace<kwall...@wallacecompany.com> >> Reply-To: "Enhanced Machine Controller (EMC)" >> <emc-users@lists.sourceforge.net> >> To: "Enhanced Machine Controller (EMC)"<emc-users@lists.sourceforge.net> >> Subject: [Emc-users] Floating Oscilloscope >> >> In order to investigate three phase issues more, it would be nice to >> measure at least two waves at a time. I have a two channel scope, but >> the channels are ground referenced. I can float the scope, but I think >> this will only allow me to measure one signal, or two if they happen to >> have the same reference point. Plus I don't think floating the scope is >> the safest practice for me or the scope. What might be good is to have a
Tried that when troubleshot switching power supplies but it's not pleasant when you forget that the scope is on an isolated transformer especially in Europe with 220V. >> box that floats like a DVM but can feed a scope channel. What sort of >> keywords should I use to find such a thing, or is there a better way? "current probe" is one of the terms you could try. It's the current that eventually drives the motor not the voltage. Current probes are easy to use in such a measurement. They are easy to get these days but you could make one in your machine shop. >> -- >> Kirk Wallace >> http://www.wallacecompany.com/machine_shop/ >> http://www.wallacecompany.com/E45/index.html >> California, USA > > A couple isolation/stepdown transformers is a good way > (I was going to say filament transformer but I guess not many would know what > that is anymore) yes we do. > > > Peter Wallace > Mesa Electronics -- Rafael ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
