I must disagree. I would cite Mr Leferinks paper from the Boston EMC Symposium. In it he concluded that a) correlation was possible for tuned dipoles to +/- 4db - an 8dB swing.and b) for test objects the variation in field strength can be as high as 40dB for "actual EUTs" and therefore correlation between different radiated emissions test methods is impossible.
I think its time we use predictive techniques rather than correlation techniques between test facilities. There will be a paper in the Santa Clara Symposium this year addressing just this issue. Best Regards Charles Grasso Senior Compliance Engineer Echostar Communications Corp. Tel: 303-706-5467 Fax: 303-799-6222 Cell: 303-204-2974 Email: [email protected]; Email Alternate: [email protected] From: Ken Javor [mailto:[email protected]] Sent: Wednesday, January 28, 2004 7:25 AM To: Tsang Steven; [email protected] Subject: Re: OATS Measurement Is the (semi?) anechoic measurement a 3 meter measurement? If it is and it meets the NSA curve, you ought to be able to correlate your anechoic and OATS measurements reasonably well. If they correlate where you don't have ambients, you ought to be able to use the anechoic measurement in lieu of the OATS measurement where the ambient intervenes. > From: "Tsang Steven" <[email protected]> > Reply-To: "Tsang Steven" <[email protected]> > Date: Wed, 28 Jan 2004 12:41:22 +0800 > To: [email protected] > Subject: OATS Measurement > > > Dear all, > I have a question regarding on OATS measurement (3m site, 30MHz to 1000MHz), I > hope someone could help me on this issue. > Currently my company is undergoing a accreditation porcess and the accreditor > is asking on the method of testing to overcome the issue of the noise floor > covering the signal generate from the EUT (i.e. Radio station signal ). > We have propose to measure the signal from EUT in an aechoic chamber and use a > signal generator to simulate the signal with a change of frequency (i.e. > 10kHz) to avoid the signal being block by the noise floor and re-measure the > signal on OATS. > This method is rejected by the assessor and asking to provide an alternative > method. Could someone provide the solution, thanks!!! > > Best Regards, > > emc_st > > _________________________________________________________________ > ??? : ???, ????? http://go.msnserver.com/HK/34698.asp > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ieee-pses.org/ > > 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://www.ieeecommunities.org/emc-pstc > This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ 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://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ 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://www.ieeecommunities.org/emc-pstc
