Annex E and F of EN 55011 contains safety and sensitive service bands. Bob Heller 3M EMC Laboratory, 76-1-01 St. Paul, MN 55107-1208 Tel: 651-778-6336 Fax: 651-778-6252 =================================
[email protected] wrote on 02/03/2012 03:02:56 AM: > From: Charlie Blackham <[email protected]> > To: Mark Gandler <[email protected]>, "EMC- > [email protected]" <[email protected]> > Date: 02/03/2012 03:05 AM > Subject: RE: [PSES] IEC61000-4-3: sensitive frequencies > Sent by: [email protected] > > Mark > > Looking at the 2006 standard, the reference to ?sensitive frequencies? is > ?The sensitive frequencies (e.g. clock frequencies) shall be > analysed separately according to the requirements in product standards? > > AFAIK there?s no reference to this in product standards (certainly > never come across it in EN55024 and EN301 489-x) > > Spot frequency tests are called up in standards such as EN55024 ? > but even then it calls up 80% AM modulation for frequencies such as > 900 MHz ? which is of limited use as GSM interference is better > simulated using pulsed interferer. > > The EMC directive requires you to consider your product and its EM > environment so you may need to develop specific tests for it ? but > labs are accredited to test to standards which can?t cover all eventualities. > > Regards > Charlie > > > > From: Mark Gandler [mailto:[email protected]] > Sent: 03 February 2012 00:48 > To: [email protected] > Subject: [PSES] IEC61000-4-3: sensitive frequencies > > Group, > what are the current test lab practices to evaluate "sensitive > frequencies" as specified in 61000-4-3? It is fair to assume what > some of the "sensitive frequencies" will be missed with 1% step, > especially in higher range. > Some of the big telco's have dedicated procedures on how to treat > sensitive or frequencies of key interest ("foki") with dedicated > levels, dwell times, 50kHz steps and so on. But it feels like an > uphill battle to convince the labs and to explain the procedure, > which brings up the suspicion what there are not much of "sensitive > frequencies" evaluations going on. > This fits in ongoing discussion about field uniformity and > calibration procedures. If you need to investigate individual > frequencies, you should calibrate the field at these frequencies. > How about 'external' frequencies sources, such as LTE or any other > mobile communications? should they not be tested separately or just > hope they get addressed during the sweep? > > Any opinions on test methodologies, besides traditional sweep are welcome. > > Thanks, > Mark Gandler > Netgear > - > ---------------------------------------------------------------- > 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]> - ---------------------------------------------------------------- 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]>
