Section 15.35(b) details the two detectors and associated limits. See below: "(b) On any frequency of frequencies above 1000 MHz, the radiated limits shown are based upon the use of measurement instrumentation employing an average detector function. When average radiated emission measurements are specified in the regulations, including emission measurements below 1000 MHz, there is also a limit on the radio frequency emissions, as measured using instrumentation with a peak detector function, corresponding to 20 dB above the maximum permitted average limit for the frequency being investigated unless a different peak emission limit is otherwise specified in the rules in this part, e.g., see ยง15.255. Unless otherwise specified, measurements above 1000 MHz shall be performed using a minimum resolution bandwidth of 1 MHz. Measurement of AC power line conducted emissions are performed using a CISPR quasi-peak detector, even for devices for which average radiated emission measurements are specified." You have to meet both. The nature of the signal is unimportant in this respect. Both limits apply.
Ghery Pettit Intel -----Original Message----- From: umbdenst...@sensormatic.com [mailto:umbdenst...@sensormatic.com] Sent: Thursday, August 16, 2001 10:37 AM To: emc-p...@majordomo.ieee.org; stu...@timcoengr.com Subject: RE: FCC rule interpretation (add'l info) Stuart, Are you confusing the requirement to meet a peak limit while also meeting the average limit? The FCC imposes a condition on meeting a limit where an average detector is specified. If you have a pulsed system, the system must meet the average limit and at the same time not be more than 20 dB higher in peak detection. This does not mean you can add 20 dB to the average limit for any signal condition. Is this issue the origin of the question? Best regards, Don Umbdenstock Sensormatic > ---------- > From: Stuart Lopata[SMTP:stu...@timcoengr.com] > Reply To: Stuart Lopata > Sent: Thursday, August 16, 2001 10:50 AM > To: emc > Subject: Fw: FCC rule interpretation (add'l info) > > > Does this imply that we can use 74 dBuV/m (at 3 meters) rather than the 54 > dBuV/m limit > if we took measurements employing peak detection? > > I left that last part out in the previous question. > ------------------------------------------- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net 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.rcic.com/ click on "Virtual Conference Hall," ------------------------------------------- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net 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.rcic.com/ click on "Virtual Conference Hall,"
