>From a practical standpoint, most of the existing SAR measurement systems use a broadband isotropic probe of some sort, so summing the components of the various transmitters is pretty easy. I agree with the assessment that if all sources can radiate simultaneously, then it should be tested that way. Since the exposure is a time dependent integral, the duty cycle of each of the sources will probably need to be taken into account. My company doesn't perform SAR testing, so there are certainly more experienced voices out there that can contribute on this.
Respectfully, Brent G DeWitt Laboratory Manager CKC Laboratories Redmond, WA email: [email protected] phone: 425-883-4757 > -----Original Message----- > From: [email protected] [mailto:[email protected]]On > Behalf Of [email protected] > Sent: Tuesday, October 18, 2005 8:29 AM > To: [email protected]; [email protected] > Subject: RE: EMF testing multiple radios > > > If the composite device can radiate all transmitters simultaneously, I > believe you will find that they will need to be tested > simultaneously. The > exposure limit standards indicate the sum of all exposure > sources, though I > am not sure that you will find that the measurement methodology for a > particular phantom is set up for simultaneous measurements. > You'll need to > work this through with your lab of choice. > > A fall back position might be to measure each separately and then > numerically sum the results per the calling standards. > > Good luck, > > Don Umbdenstock > Manager Compliance Engineering > > Tyco Safety Products / Sensormatic > 6600 Congress Avenue > Boca Raton, FL 33487 USA > 561.912.6440 > [email protected] > > > -----Original Message----- > From: Carpentier Kristiaan [mailto:[email protected]] > Sent: Tuesday, October 18, 2005 10:49 AM > To: EMC-PSTC List > Subject: EMF testing multiple radios > > Hi group, > > A product contains multiple radio's at the same and/or different > frequencies > (ex. WLAN & Bluetooth (2.4GHz) & WLAN 5GHz. > Do all radios have to be activated (transmitting) simultaneously > to measure > EMF, SAR at once or shall each radio be tested individually? Is this maybe > country dependent? > > Best regards, > > Kris Carpentier > Regulatory & Approvals > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. Website: http://www.ieee-pses.org/ > > To post a message to the list, send your e-mail to [email protected] > > Instructions: http://listserv.ieee.org/listserv/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] > > All emc-pstc postings are archived and searchable on the web at: > > http://www.ieeecommunities.org/emc-pstc > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. Website: http://www.ieee-pses.org/ > > To post a message to the list, send your e-mail to [email protected] > > Instructions: http://listserv.ieee.org/listserv/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] > > All emc-pstc postings are archived and searchable on the web at: > > http://www.ieeecommunities.org/emc-pstc > -- > No virus found in this incoming message. > Checked by AVG Anti-Virus. > Version: 7.0.344 / Virus Database: 267.12.4/142 - Release Date: 10/18/2005 > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.344 / Virus Database: 267.12.4/142 - Release Date: 10/18/2005 - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
