And that is what these standards do. The placement of the test sample on the table top, and the lay of the cables is tightly specified. Ken Javor Phone: (256) 650-5261
> From: John Woodgate <[email protected]> > Date: Wed, 17 Oct 2012 19:03:13 +0100 > To: <[email protected]> > Subject: Re: [PSES] OATS vs FAR Radiated Emissions Limits > > In message <cca44bd5.2f750%[email protected]>, dated Wed, 17 > Oct 2012, Ken Javor <[email protected]> writes: > >> There are indeed near field test methods. They are enshrined in >> vehicle-based standards, such as MIL-STD-461, DEF-STAN-5941, >> RTCA/DO-160 and its EUROCAE equivalent, and CISPR 25 for automotive use. >> >> In order to address the valid concerns Mr. Woodgate raises, these >> standards not only specify antenna-test sample separation, but also the >> specific type of electric field probe or antenna used in each frequency >> band. > > Indeed: you can get repeatability for near-field measurements on one > product by rigidly controlling the test conditions. But each product > needs its own set of test conditions because exact physical disposition > of *everything* is required. > -- > OOO - Own Opinions Only. See www.jmwa.demon.co.uk > The longer it takes to make a point, the more obtuse it proves to be. > John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK > > - > ---------------------------------------------------------------- > 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.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used > formats), large files, etc. > > 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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]>
