Also see the FCC Rules. Part 15.31 (f) has additional guidance. -Bob
From: Charlie Blackham [mailto:char...@sulisconsultants.com] Sent: Monday, October 28, 2019 3:05 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [EXTERNAL] Re: [PSES] Reading or Limit Conversion? CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. 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/<https://urldefense.proofpoint.com/v2/url?u=https-3A__sulisconsultants.com_&d=DwMFAw&c=YEQWdgm3lcu5w_Y3fWOQZUGtAhl_lImuPlnxuD4zIqo&r=E-bIuBpV7qaznZidXiTC0TWb0gnLg1HYoyssP-ii97E&m=ik_Nvilz-_f2zABFWOdb7XdtIJqI-YoKbenVWx65w4I&s=2FZn7sFD3uwQYngObHOG8Sjk55lFP0rFk8WvIYEjx4g&e=> 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? 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