Take the reading. It's the only way to be sure.. It is not unusual for a product to pass @ 3m and then fail at 10m (or vice versa).
Thanks! Charles Grasso W: 303-706-5467 From: John Woodgate [mailto:j...@woodjohn.uk] Sent: Monday, October 28, 2019 1:30 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Reading or Limit Conversion? This message originated outside of DISH and was sent by: owner-emc-p...@listserv.ieee.org<mailto:owner-emc-p...@listserv.ieee.org> This inconsistency (in the underlying CISPR standards) should be addressed by CISPR, but it is difficult to get consensus whenever it is discussed. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk<http://www.woodjohn.uk> Rayleigh, Essex UK On 2019-10-28 07:05, Charlie Blackham wrote: David Hmm, different standards appear to deal with this differently: * EN 55011:2009 section 6.2.2.3 instructs you to normalise the measured data to the specified distance in the standard * EN 55032:2015 section 9 instructs you to adjust the limits (in fact it gives limits for 3 and 10m which are 10 dB apart and not 10.45dB apart if you extrapolate using 20LogD) * ANSI 63-4:2014 instructs you to extrapolate the results If the standard or test method doesn't specify, I guess the important thing is to be clear in the report as to what's been done. Regards Charlie Charlie Blackham Sulis Consultants Ltd Tel: +44 (0)7946 624317 Web: https://sulisconsultants.com/ Registered in England and Wales, number 05466247 From: itl-emc user group <itl...@itl.co.il><mailto:itl...@itl.co.il> Sent: 28 October 2019 06:37 To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [PSES] Reading or Limit Conversion? A number of standards list radiated emission limits in the frequency range of 30-1000 MHz for test distance greater than 3 or 10 meters. Testing is normally performed at either 3 meters or 10 meters on an Open Area Test Site. A question has arisen concerning reporting the test results in these cases. Any opinions concerning which should be converted: a. Convert the limit to the relevant test distance (3 meters or 10 meters) by adding correction factor or b. Convert the reading to the unit and test distance listed in the standard (convert dBµV to µV and add correction factor for distance) On some occasions I have seen option b. above used. Which option is preferable? All opinions welcome Regards, David Shidlowsky | Technical Reviewer Address 1 Bat-Sheva St. LOD 7120101 Israel Tel 972-8-9186113 Fax 972-8-9153101 Mail : dav...@itlglobal.org<mailto:dav...@itlglobal.org>/dav...@itl.co.il<mailto:dav...@itl.co.il>/e...@itl.co.il Web www.itlglobal.org<http://www.itlglobal.org/> [cid:image001.png@01D58D9E.A73400D0]ITL Waze: https://waze.com/ul/hsv8vccn2j Fill out Customer Satisfaction Survey<http://app.sqm.co.il/SitePages/Questionnaire.aspx> Global Certifications You Can Trust This e-mail message may contain privileged or confidential information. If you are not the intended recipient, you may not disclose, use, disseminate, distribute, copy or rely upon this message or attachment in any way. 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