CISPR 22 contains a wealth of methods for this.
The V network (LISN) for AC and DC supply The CDN method The ISN method The 150 Resistor method Current probe + capacitive voltage probe All are described in Annex C (normative) and while they are mentioned in the main text for telecom measurements, the methods are well applicable to any connection port. Well, if we think that the mains should be tested with a LISN or AMN, but the standard says nothing about DC power supplies, does it ? Strictly spoken it does not actually state that the mains port should be tested using a AMN or LISN too. It’s all assumed.( par 9.2) If you read Clause 5, one could conclude that current and voltage measurements to annex C are allowed for the mains port too. There is no prescription to use the LISN for mains measurement. Table 3 and 4 do only refer to *other limits* for the telecom port. The only referral to a LISN or AMN related to the mains port is a loose sentence in 9.4 : “A mains port is connected, via its mains cord (!!?!) , to an AMN.” it does not say the measurement shall use the AMN or LISN too. Well that is the overall problem with CISPR 22. It’s a mess. All requirements are “circumstantial” (free after “circumstantial evidence”) And I do not even mention the lack of coordination between CISPR16 and CISPR22 , it seems as if their respective committees never even read their products. (Paragraphs and citations from CISPR 22 ed 3 and 4) Regards, Ing. Gert Gremmen [email protected] <mailto:[email protected]> www.cetest.nl Kiotoweg 363 3047 BG Rotterdam T 31(0)104152426 F 31(0)104154953 Before printing, think about the environment. Van: [email protected] [mailto:[email protected]] Namens Honkala, Ari (Espoo) Verzonden: Tuesday, August 31, 2010 7:33 AM Aan: [email protected] Onderwerp: RE: Alternative Conducted EMI method for CISPR 22 Hi, If the problem is that EUT does not start due to series inductance, you may try to use LISN in parallel, as a voltage probe. The principle is explained in CISPR 16-2-1 Annex A.5 Ari Honkala SGS Fimko Oy ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: 31. elokuuta 2010 1:20 To: [email protected] Subject: Alternative Conducted EMI method for CISPR 22 Hello Group, Does anyone know if there is an alternative conducted EMI power line measurement method for CISPR 22? I'm having trouble testing a DC powered unit with a traditional CISPR 16 LISN. Someone mentioned that a current measurement can be made on power lines using a current clamp instead. I could not find anything about measuring power lines with a current clamp. What limits would be used? The only reference to current clamp measurements in CISPR 22 is for telecommunication ports. I know ANSI C63.4 mentions you can make measurements using a current clamp, however CISPR 22 does not. Any information would be helpful. Thanks, Tim Pierce TAP Engineering, LLC. Information in this email and any attachments is confidential and intended solely for the use of the individual(s) to whom it is addressed or otherwise directed. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the Company. Finally, the recipient should check this email and any attachments for the presence of viruses. The Company accepts no liability for any damage caused by any virus transmitted by this email. 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To post a message to the list, send your e-mail to <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]> - 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]>
