James, please find the following Class B radiated emissions limits from CISPR 32 @ IEC:2012 for your reference. Thank you. -Grace
Table A.4 - Requirements for radiated emissions at frequencies *up to 1 GHz*for Class B equipment Table clause: A4.1, Frequency range MHz: 30 - 230, Measurement Distance m: 10, Measurement Detector type/bandwidth: Quasi Peak/120 kHz, Class B limits dB(uV/m) *OATS/SAC* (see Table A.1): 30 Table clause: A4.1, Frequency range MHz: 230 - 1 000, Measurement Distance m: 10, Measurement Detector type/bandwidth: Quasi Peak/120 kHz, Class B limits dB(uV/m) *OATS/SAC* (see Table A.1): 37 Table clause: A4.2, Frequency range MHz: 30 - 230, Measurement Distance m: 3, Measurement Detector type/bandwidth: Quasi Peak/120 kHz, Class B limits dB(uV/m) *OATS/SAC* (see Table A.1): 40 Table clause: A4.2, Frequency range MHz: 230 - 1 000, Measurement Distance m: 3, Measurement Detector type/bandwidth: Quasi Peak/120 kHz, Class B limits dB(uV/m) *OATS/SAC* (see Table A.1): 47 Apply only table clause A4.1 or A4.2 across the entire frequency range Table A.5 - Requirements for radiated emissions at frequencies *above 1 GHz * for Class B equipment Table clause: A5.1, Frequency range MHz: 1 000 - 3 000, Measurement Distance m: 3, Measurement Detector type/bandwidth: Average/1 MHz, Class B limits dB(uV/m) *FSOATS* (see Table A.1): 50 Table clause: A5.1, Frequency range MHz: 3 000 - 6 000, Measurement Distance m: 3, Measurement Detector type/bandwidth: Average/1 MHz, Class B limits dB(uV/m) *FSOATS *(see Table A.1): 54 Table clause: A5.2, Frequency range MHz: 1 000 - 3 000, Measurement Distance m: 3, Measurement Detector type/bandwidth: Peak/1 MHz, Class B limits dB(uV/m) *FSOATS* (see Table A.1): 70 Table clause: A5.2, Frequency range MHz: 3 000 - 6 000, Measurement Distance m: 3, Measurement Detector type/bandwidth: Peak/1 MHz, Class B limits dB(uV/m) *FSOATS* (see Table A.1): 74 Apply table clause A5.1 and A5.2 across the entire frequency range from 1 000 MHz to the highest required frequency of measurement derived from Table 1. Under A1.3 Limitations and clarfications of Table A.1, "*An FSOATS may be a SAC/OATS with RF absorber on the RGP or a FAR*." On Tue, Oct 16, 2012 at 10:26 AM, Pawson, James <[email protected]>wrote: > > We've just received EN 61000-6-3:2007 + A1:2011 which has added the > ability to test radiated emissions in either an OATS, Fully Anechoic Room > (FAR) or TEM waveguide. > > What puzzled me is the limits for the FAR @ 3m: > > 30MHz ~ 230MHz: 42 to 35dBuV decreasing linearly with the log of > the frequency > 230MHz ~ 1GHz: 42dBuV > > Checking a draft version of CISPR 32 also shows these same limits for an > FAR. > > These limits are lower than those for an OATS at 3m. *Does anyone know > why the limits are lower and of a different characteristic?* I'm guessing > something to do with the lack of reflective ground plane in the FAR. > > Does anyone have any further information? > > Many thanks > James > > ~~~~~~~~~~~~~~~~~~~~~ > James Pawson > Leading Hardware Engineer - EMC > *EchoStar Europe* > > > - > ---------------------------------------------------------------- > > 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]>
