It's my understanding that the 10Hz VBW provides a filter time-constant approximating that of an average detector.
Ralph McDiarmid, AScT Compliance Engineering Group Xantrex Technology Inc. > -----Original Message----- > From: owner-emc-p...@listserv.ieee.org > [mailto:owner-emc-p...@listserv.ieee.org] On Behalf Of Tom Cokenias > Sent: August 23, 2004 6:51 AM > To: Ridler, Samantha; 'EMC-PSTC@LISTSERV.IEEE.ORG' > Subject: Re: Average Detection > > > Hello Samantha, > > For analyzers that do not incorporate an average detector, > the FCC has specified settings of RBW 1 MHz and VBW of 10 Hz > for average measurements in other parts of the Rules for > measurements above 1 GHz. They have been accepting these > settings for many years for spread spectrum and now 802.11 > radios operating under 15.247 of the Rules. > > best regards > > Tom Cokenias > > T.N. Cokenias Consulting > P.O. Box 1086 > El Granada CA 94018 > > tel 650 726 1263 > fax 650 726 1252 > > cell 650 302 0887 > > At 8:21 AM +0100 8/23/04, Ridler, Samantha wrote: > >Hello All > > > >FCC part 18 requires the use of an Average detector. For > measurements > >above 1GHz on a HP8593E EMC (Spectrum) analyser, would > using a Video > >Average of 100 or more be equivalent to taking a measurement with an > >Average detector? > > > > > >It has been suggested to me by a test house that this is the > case, but > >I have not managed to find any rationale for this. > > > >The setup for the Analyser in question during the measurent was as > >follows if this helps: SPAN = 2GHz, RBW =1MHz, VBW = 3MHz, > SWEEP =40ms > > > >Many thanks. > > > >Samantha Ridler BEng MIEE > >Compliance Engineer > > > >---------------------------------------------------------------- > >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 emc-p...@ieee.org > > > >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: > > > > Ron Pickard: emc-p...@hypercom.com > > Dave Heald: emc_p...@symbol.com > > > >For policy questions, send mail to: > > > > Richard Nute: ri...@ieee.org > > Jim Bacher: j.bac...@ieee.org > > > >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 emc-p...@ieee.org > > 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: > > Ron Pickard: emc-p...@hypercom.com > Dave Heald: emc_p...@symbol.com > > For policy questions, send mail to: > > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > 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 emc-p...@ieee.org 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
