John:
Unfortunately, American consumer electronics has no E-field immunity requirement. The only help a consumer gets is that little paragraph of legalese that advises you to re-orient your device and move further away from emitters. OTOH, most consumer equipment design which takes emission compliance into account will also yield reasonable immunity levels. My personal experience indicates that most immunity problems with consumer electronics is not a design problem but a reliability problem. As an example, last year a friend asked me to repair his semi-pro mixer board (used in a church environment); he had problems "everywhere" with distortion, low gain and external RF susceptibility. However, the mixer board was fine; it was his patch cords that were horribly abused and leaky. Ed Price WB6WSN Chula Vista, CA USA -----Original Message----- From: John Woodgate [mailto:j...@jmwa.demon.co.uk] Sent: Saturday, September 12, 2015 11:47 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] RF Common Mode Immunity Test Question In message < <mailto:FCA549BE3ECF9D4CB8CB8576837EA48920AF42@ZEUS.cetest.local> FCA549BE3ECF9D4CB8CB8576837EA48920AF42@ZEUS.cetest.local>, dated Sat, 12 Sep 2015, "ce-test, qualified testing bv - Gert Gremmen" < <mailto:g.grem...@cetest.nl> g.grem...@cetest.nl> writes: >A Ham never can be a source of interference, by definition (if they >respect their limits- in more than one way). It is clearly not true, given the unlimited lack of immunity exhibited by some products. Immunity isn't even controlled in the Americas. > >To me an amateur is not a HAM, but that is a matter of language I >suppose. Yes. 'Amateur' is the larval form. (;-) > >My example showed a (spiced up) example of lack of immunity in a >professional audio installation , that due pragmatic testing, too >cables with average screening properties Was it definitely due to cables? Much professional PA equipment is none too good on immunity. And there are far too many installations that don't exclusively use balanced lines. > -- OOO - Own Opinions Only. With best wishes. See <http://www.jmwa.demon.co.uk> www.jmwa.demon.co.uk When I turn my back on the sun, it's to look for a rainbow 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 < <mailto:emc-p...@ieee.org> emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: <http://www.ieee-pses.org/emc-pstc.html> 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/> http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: <http://www.ieee-pses.org/> http://www.ieee-pses.org/ Instructions: <http://www.ieee-pses.org/list.html> http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: <http://www.ieee-pses.org/listrules.html> http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas < <mailto:sdoug...@ieee.org> sdoug...@ieee.org> Mike Cantwell < <mailto:mcantw...@ieee.org> mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: < <mailto:j.bac...@ieee.org> j.bac...@ieee.org> David Heald: < <mailto:dhe...@gmail.com> dhe...@gmail.com> - ---------------------------------------------------------------- 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://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://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
