Dear EMC Experts, As we know, ANSI C63.4 requires volumetric NSA for alternative test sites, which means that we should evaluate NSA of the site at, in addition to the center, the points moved specific distance toward front, right, left (and back, maybe) from the center in general.
Clause 5.4.6.5 of the standard says: ... "test volume" is defined as that volume traced out by the largest equipment or system to be tested as it is rotated about its center location through 360 degrees. ... For vertical polarization, the off-center positions, of the transmit antenna are at the periphery of the test volume. If we want to test EUTs which completely fill a typical 1m x 1.5m test table, I think we should evaluate NSA of the site also at the points 0.9m (half of diagonal of the table) or more from the center. However, I recently noticed there are some people who think that evaluation at the points 0.75m from the center should enough for ANSI C63.4, maybe because of Figure 8c of ANSI C63.4-2003 (or Figure 6 of CISPR 16-1-4:2007), or maybe because of CISPR 22 Annex A. Is there anyone who does, or does not, think that NSA evaluation at the points 0.75m from the center should enough for ANSI C63.4, for EUTs which may completely fill a typical 1m x 1.5m table? Regards, Tom -- Tomonori Sato <vef00...@nifty.ne.jp> URL: http://homepage3.nifty.com/tsato/ - ---------------------------------------------------------------- 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://product-compliance.oc.ieee.org/ 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...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
