Years ago I recall discussions about electronic wristwatches and FCC compliance; the power drawn from the watch battery was less than the output power of an emission that would just pass the Class B limit therefore compliance was inherent and no EMC testing was required. I don't know if this was ever codified.
Extending this concept to a radio would give new meaning to a flea-powered transmitter. Best Regards, Mike From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Crane, Lauren Sent: Wednesday, January 25, 2012 1:31 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: EMC and RTTE directive - out of scope because of power levels? With regard to the EU EMC Directive, can anyone recommend a rule of thumb for when it can be said that equipment is a) incapable of generating or contributing to electromagnetic emissions which exceed a level allowing radio and telecommunication equipment and other equipment to operate as intended; and b) it will operate without unacceptable degradation in the presence of the electromagnetic disturbance normally consequent upon its intended use? My rough guess for a) is that it is fair to claim if the equipment emissions are below 20% of the limit line for the same group & class of equipment. My rough guess for b) is that it is fair to claim if the equipment has operated in its intended environment without known errors due to electromagnetic disturbance. The thesis I am exploring here is that an known EMC emitter is not necessarily in scope of the EMC directive if Article 1.3 is valid, and what is a sound way to test its validity. Although I cannot find it explicitly in the RTTE directive, I wonder if there is a similar concept in practice - radio equipment having such low power levels such that they are considered benign? Regards, Lauren Crane (mr.) KLA-Tencor | Chief Engineer Staff Corp. Product Compliance Mgr. ================================= - ---------------------------------------------------------------- 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://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> - ---------------------------------------------------------------- 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://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>
