Hello Dan, You have 2 interesting options open to you, but you do not have enough information for either.
The FCC revised their Part 15 rules for conducted emissions this September essentially adopting CISPR 22, measuring in both QP and Ave. The product needs to pass both limits to establish compliance. However, the new rules are not mandatory until July 2004 for new designs (production and importation must include the new rules by July 2005). Under the old rules, the product is measured with a QP detector and compared to the limits. If an over-limit condition is observed, one then applies the broadband test. The broadband test compares the signal measured with an Average detector to the signal measured with the QP detector. If the Ave level is more than 6 dB below the QP level, the signal is considered broadband and a 13 dB relaxation is allowed. Also note that under the old rules, the spectrum of concern is 450 kHz to 30 MHz compared to 150 kHz to 30 MHz for the new rules. For the data that you presented, no one can tell if the product passes or fails because there is no QP data. Both the new and the old standard require a QP measurement. Hope this helps. Regards, Don Umbdenstock Tyco Safety Products -- Sensormatic > ---------- > From: Dan Pierce[SMTP:[email protected]] > Reply To: Dan Pierce > Sent: Thursday, November 07, 2002 4:04 PM > To: [email protected] > Subject: Conducted Line Emissions > > <<File: Dan Pierce.vcf>><<File: Pages from Line conduction.pdf>> > Greetings: > > I am looking for proof that I can use the averaged value for emissions > rather than the peak value. Attached is a chart that I was given by an > Asia > test site that told me I failed. According to my past experience, I > believe > that the average power is what I should be concerned about. Similar to > radiated emissions right? > > > Thank you. > > Daniel J. Pierce > Sr. Design Engineer > OpenGlobe, Inc. > > (An Escient Technologies Affiliate) > 6325 Digital Way > Indianapolis, IN 46278 > > mailto:[email protected] > > P: (317) 616.6587 > F: (317) 616.6587 > > > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
