So I would have to deduce then that ANSI C63.4 is schizophrenic, in that it doesn't trust the specified LISNs to work as they say they should. If the standard wants you to measure the LISN plus your facility filter, then you are characterizing your facility, not just the LISN.
Logically, where does it end? Surely the impedance of the local powerlines has a slight effect on the overall impedance, and then what about the generators at the power station? Of course, I'm being absurd here, but why can't they just spec a LISN that provides sufficient isolation under all conditions? Ed Price ed.pr...@cubic.com WB6WSN NARTE Certified EMC Engineer Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 Military & Avionics EMC Is Our Specialty > -----Original Message----- > From: Spencer, David H [mailto:david.spen...@xerox.com] > Sent: Tuesday, January 27, 2009 10:15 AM > To: Price, Edward; emc-p...@ieee.org > Subject: RE: Calibration Standards for LISN > > Ed, > > I agree, and I've verified that with the LISN(s) I use there > is no impact; however, ANSI C63.4, E1, b) states that > unless it can be shown that the RF filters do not impact the > impedance then you must perform the verification with the RF > filters in circuit. > > Really it's a case for either performing the verification in > house OR sending the RF filters with the LISN out as part of > the calibration (at least once). > > I know some facility RF line filters are not easily removed! > > Regards, > > Dave Spencer > EMC Engineer > Xerox Corp. > > -----Original Message----- > From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf > Of Price, Edward > Sent: Tuesday, January 27, 2009 1:04 PM > To: emc-p...@ieee.org > Subject: RE: Calibration Standards for LISN > > > > But isn't it the purpose of the AMN to present an impedance > to the EUT which is unaffected by whatever unknown impedance > exists at the source of the power? - 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...@ptcnh.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
