Yes Chris, this is exactly what the criterium A is about. The manufacturer should specify the performance of the product during exposure to radiated (or conducted) RF-interference. The device should of course not loose 100 % of it's performance though.
This way, ideally, customers are able to choose a suitable product if (f.a.) they live nearby a transmitter or if they love using their GSM phone while listening Mozart ... Most manufacturers however, are not so specific about the actual value of the reduced performance......:<(( But, for professional audio a specific product standard set for emission and immunity exists, EN 55103-1/2. This standard is more specific then EN 50082-1 :1997 and adds several new test types compared to EN 50082-1 : 1997 Regards, Gert Gremmen, (Ing) ce-test, qualified testing =============================================== Web presence http://www.cetest.nl CE-shop http://www.cetest.nl/ce_shop.htm /-/ Compliance testing is our core business /-/ =============================================== >>-----Original Message----- >>From: [email protected] >>[mailto:[email protected]]On Behalf Of Colgan, Chris >>Sent: Tuesday, September 18, 2001 6:17 PM >>To: 'Emc-Pstc' (E-mail) >>Subject: performance criterion A >> >> >> >>According to EN50082-1, no degradation of performance below a performance >>level specified by the manufacturer is allowed whereas EN55020 >>gives a clear >>cut wanted/unwanted signal to noise ratio of 40dB. Now say my audio >>amplifier specs give a signal to noise ratio of x dB but also state in a >>footnote that this signal to noise ratio may be degraded in the >>presence of >>a modulated RF field (you can see where I'm going). Could my audio >>amplifier then demodulate the 1kHz tone in the conducted and radiated >>immunity tests and pass performance criterion A? >> >>I know the "get out clause" approach is far from ideal but I am spending >>rather a lot of time working on an amplifier at the moment and I will have >>to justify the time (or not) sooner or later. >> >>Cheers >> >>Chris Colgan >>Compliance Engineer >>TAG McLaren Audio Ltd >>The Summit, Latham Road >>Huntingdon, Cambs, PE29 6ZU >>*Tel: +44 (0)1480 415 627 >>*Fax: +44 (0)1480 52159 >>* Mailto:[email protected] >>* http://www.tagmclaren.com >> >> >> >> >> >>************************************************************** >> Please visit us at www.tagmclaren.com >>************************************************************** >> >>The contents of this E-mail are confidential and for the exclusive >>use of the intended recipient. If you receive this E-mail in error, >>please delete it from your system immediately and notify us either >>by E-mail, telephone or fax. You should not copy, forward or >>otherwise disclose the content of the E-mail. >> >>TAG McLaren Audio Ltd >>The Summit, 11 Latham Road >>Huntingdon, Cambs, PE29 6ZU >>Telephone : 01480 415600 (+44 1480 415600) >>Facsimile : 01480 52159 (+44 1480 52159) >> >>************************************************************** >> Please visit us at www.tagmclaren.com >>************************************************************** >> >>------------------------------------------- >>This message is from the IEEE EMC Society Product Safety >>Technical Committee emc-pstc discussion list. >> >>Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ >> >>To cancel your subscription, send mail to: >> [email protected] >>with the single line: >> unsubscribe emc-pstc >> >>For help, send mail to the list administrators: >> Michael Garretson: [email protected] >> Dave Heald [email protected] >> >>For policy questions, send mail to: >> Richard Nute: [email protected] >> Jim Bacher: [email protected] >> >>All emc-pstc postings are archived and searchable on the web at: >> No longer online until our new server is brought online and >>the old messages are imported into the new server. >> >>
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