And technically speaking, the way to do the latter is to specify a not-to-exceed voltage distortion, either total, and/or spectral distribution, that must be checked prior to making the current measurement. Ken Javor
Phone: (256) 650-5261 > From: John M Woodgate <j...@jmwa.demon.co.uk> > Date: Sun, 25 Apr 2010 12:12:51 +0100 > To: "ce-test, qualified testing bv - Gert Gremmen" <g.grem...@cetest.nl> > Cc: Ken Javor <ken.ja...@emccompliance.com>, <EMC-PSTC@LISTSERV.IEEE.ORG> > Subject: Re: [PSES] Harmonic Emissions Testing > > In message <FCA549BE3ECF9D4CB8CB8576837EA4890A7255@ZEUS.cetest.local>, > "ce-test, qualified testing bv - Gert Gremmen" <g.grem...@cetest.nl> > writes >> The reasons to limit harmonic currents are not all emc-related, >> >> and mostly power distribution related: > > That is regarded as an EMC matter. > > The issue of absolute or proportional limits is complex. It's not just > 'history' as such, although you might read IEC 61000-1-4 some time. > > Logic says that harmonic current limits for a given technology should be > proportional to fundamental current, and indeed IEC 61000-3-12 is based > on proportional limits, but that in turn demands requirements on source > impedance (expressed as shot-circuit power) in order to control *voltage > distortion*. > -- > This is my travelling signature, adding no superfluous mass. > John M Woodgate - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
