Look at CISPR 16-1, Annex M for insight. This provides the basis for the +/- 4 dB.
3 of the 4 dB is already measurement uncertainty with the remaining 1 dB as site imperfections. However this MU does not include the signal source or the repeatibility of the test procedure. Bob Heller 3M Product Safety, 76-1-01 St. Paul, MN 55107-1208 Tel: 651- 778-6336 Fax: 651-778-6252 ============================================================================================= "KC CHAN [PDD]" <kcc...@hkpc.org> To: emc-p...@majordomo.ieee.org cc: (bcc: Robert E. Heller/US-Corporate/3M/US) 07/17/2002 02:53 Subject: NSA measurement and its uncertainty AM Please respond to "KC CHAN [PDD]" Hi all I just got a tough question from our auditor about NSA and uncertainty. He asked if we will include the uncertainty into our Normalized Site Attenuation measurement or not. If we include the uncertainty of NSA measurement, it is impossible for us to ensure it is within the +/- 4dB with 95% CL. I would like to seek comment form the expertise if it is necessary to include the uncertainty when we do the NSA measurement. Thank you KC Chan ------------------------------------------- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"