Mr. Javor, I guess I can't argue your points until I read your paper. Please send me a Word copy. I assure you, I will respect the copyright and destroy the article after I read it.
I think Mr. Betz original post needs to be answered in more thorough detail >from a practical application of the conducted immunity test standpoint. Theory is wonderful, but the question that was asked is how do you wire the thing up to perform the test? As I read his original request, and I may be reading more into it than was intended, he has a similar situation to what I have. That is, the metallic case of his product is normally grounded in production applications. Lifting the ground to create an artificial 150 Ohm environment defeats the purpose of the ground and creates additional immunity problems that would not be present in the production application. I suspect there are other members out there that have run this test many more times than I have and who could shed significant light on this subject. There are at least two of us, Mr. Betz and myself, who would really like to hear from you. Dan > -----Original Message----- > From: Ken Javor [SMTP:[email protected]] > Sent: Friday, February 14, 2003 5:39 PM > To: Dan Kinney (A); Oliver Betz; [email protected] > Subject: Re: Grounding of EUT in EN61000-4-6 conducted immunity test > > > snip: > In the case where a CDN is installed on each line from the EUT, how are > the > signal line shields handled at the EUT - left unterminated, terminated to > ground, or terminated to the metallic case? > snip > > I am no expert on the specifics of EN61000-4-6. I like to think I have a > good understanding of the physics of field-to-wire coupling. People > reading > that article I referred to may or may not agree with my self-assessment. > > With regard to the specific question above, I would assume, and I stress > assume, that shield termination at the EUT would have to be production > configuration. To me that is not the issue at all, but the real issue > raised by the original question was grounding of the EUT chassis to the > ground plane. That is what my paper talked about (in part). > > For those who are interested and do not have access to the symposium > record, > either hard copy or CD, I can send an electronic version in Word. Any > recipient would have to swear not to reproduce it because it is > copyrighted > by the IEEE. > > Ken Javor > > > From: "Dan Kinney (A)" <[email protected]> > > Date: Fri, 14 Feb 2003 17:13:06 -0500 > > To: "'Ken Javor'" <[email protected]>, "Dan Kinney > > (A)"<[email protected]>, Oliver Betz <[email protected]>, > > [email protected] > > Subject: RE: Grounding of EUT in EN61000-4-6 conducted immunity test > > > > Thanks for the quick response. Please let me explore this further. I > have > > used the "special case" as the general case where the EUT has many > signal > > lines in which it would be too costly and impractical to have a CDN on > each > > line. The special case allows the test engineer the flexibility of > > disregarding the multiple impedances by way of the method described in > the > > body of the document and amplified in Annex A. I will admit I somehow > > missed the point about the lower impedance requirement of the AE. In > the > > case where a CDN is installed on each line from the EUT, how are the > signal > > line shields handled at the EUT - left unterminated, terminated to > ground, > > or terminated to the metallic case? EN61000-6-2 is the generic immunity > > standard we use. It states the functional earth port of the EUT will be > > tested using this basic standard. If the earth is to be lifted, how is > this > > possible? > > > > I was not a member of this community in 1997 thus do not have a copy of > the > > symposium record. Is it available on the IEEE site? > > Thanks again for your quick response. > > Dan Kinney > > > >> -----Original Message----- > >> From: Ken Javor [SMTP:[email protected]] > >> Sent: Friday, February 14, 2003 4:41 PM > >> To: Dan Kinney (A); Oliver Betz; [email protected] > >> Subject: Re: Grounding of EUT in EN61000-4-6 conducted immunity test > >> > >> I was working off IEC 1000-4-6 (1996), Figures 2 and 5b, which cover > >> direct > >> injection and show the EUT isolated above ground. Figure 6 shows clamp > >> injection and EUT isolation above ground. What you are referencing is > a > >> special case in the annex when the cm 150 Ohm impedance cannot be met. > >> The > >> theory is, I believe, as I stated before. Incidentally clamp injection > is > >> fundamentally different than CDN injection. CDN injects > line-to-ground, > >> and > >> clamp injects in series with the cable. The standard specifically says > >> that > >> when using a clamp installed between EUT and AE, the AE must be an > equal > >> or > >> lower impedance than the EUT. This is opposite of what you want with a > >> CDN. > >> My paper covers that issue in detail. It appeared in the 1997 IEEE EMC > >> Symposium record, page 479. > >> > >> Ken Javor > >> > > > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: [email protected] > Dave Heald: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > > Archive is being moved, we will announce when it is back on-line. > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
