Bonjour,
Very good question and the answer is, as usual, yes and no… The latest discussion I had on that subject with a top representative of ANSI with the presence of a top representative of the FCC concluded that: “Using absorbers on the floor to perform tests over 1 GHz would be acceptable to ANSI (and the FCC) since it has been demonstrated that over “some” GHz the effect of the ground plane is neglectable BUT, in case of dispute, the test without absorbers will prevail for FCC Compliance.” Beware also that, at all times, the specifics of ANSI C63.4 must be followed (equipment setup, configuration, exploration etc..) and that over 6 GHz only ANSI C63.4 exist… This situation will exist until ANSI come with a site (and test) definition over 1 GHz. Regards, ========================================== Benoit Nadeau, ing. M.ing. Gérant du Groupe Conformité (Conformity Group Manager) Matrox 1055 boul. St-Régis Dorval (Québec) Canada H9P 2T4 Tél: (514) 822-6000 (2475) FAX: (514) 822-6275 [email protected] <mailto:[email protected]> www.matrox.com <http://www.matrox.com> ========================================== ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Flavin, John Sent: Tuesday, March 24, 2009 6:04 PM To: [email protected] Subject: CISPR and FCC Radiated Emissions Testing above 1GHz We have some questions concerning radiated emissions testing requirements above 1GHz for IT equipment. The basic question is whether a single test setup can be sufficient for both FCC and CISPR when testing for emissions at frequencies above 1 GHz. The FCC uses ANSI C63.4 to define the test setup (specifically, the test site). C63.4 currently says that a site acceptable for testing up to 1 GHz can be used for testing above 1 GHz, but also states that "additional site validation requirements above 1GHz are under study". The CISPR 22/CISPR 16-1-4 test method coming into effect next year provides requirements for the test site (absorber at the OATS, etc.) and has an upper frequency of 6 GHz. The FCC requires testing up to the 5th harmonic or 40GHz, whichever is lower. There are also some differences in the limits above 1 GHz. Does this mean that when we test above 1 GHz, we must perform two separate tests, one to the FCC requirements, and one to CISPR22/CISPR16-1-4? Does the FCC envision acceptance of CISPR22 test results for testing above 1GHz as they currently do for <1GHz (and more importantly, using the CISPR22/16-1-4 setup)? John D. Flavin Teradata TCP Engineering 17095 Via del Campo San Diego, CA 92127 [email protected] V: (858) 485-3874 F: (213) 337-5432 - 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]> - 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]>
