I agree with Dennis. Any measurement of anything has uncertainty. The applicable question is; can we agree on a uniform method of evaluation of that uncertainty. Many of the procedures and methods we use in the EMC world are not perfect, but if we strive to make them as uniform as possible, we may have common ground for agreement with respect to the results.
Standard disclaimers for personal opinion apply! Brent Dewitt, AB1LF Milford, MA From: dward [mailto:dw...@pctestlab.com] Sent: Sunday, October 30, 2016 1:46 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Measurement Uncertainty Above 18 GHz All measurements are subject to uncertainty. Because there is no “standard” for sites above a specific frequency does not mean that measurements are not ‘uncertain’. It just means we may not know them in relation to a specific standard. So, while measurement is always “uncertain”, it is basically more uncertain simply because we have no established gage to judge them by (yet). Dennis Ward This communication and its attachements contain information from PCTEST Engineering Laboratory, Inc., and is intended for the exclusive use of the recipient(s) named above. It may contain information that is confidential and/or legally privileged. Any unauthorized use that may compromise that confidentiality via distribution or disclosure is prohibited. Please notify the sender immediately if you receive this communication in error, and delete it from your computer system. Usage of PCTEST email addresses for non-business related activities is strictly prohibited. No warranty is made that the e-mail or attachments(s) are free from computer virus or other defect. Thank you. From: John Woodgate [mailto:jmw1...@btinternet.com] Sent: Saturday, October 29, 2016 9:16 AM To: EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] Measurement Uncertainty Above 18 GHz I don't see that one can tell if it's reasonable or not without a lot more information, which is probably confidential to your company. But there isn't any major effect that occurs just above 18 GHz to make CISPR 16-4-2 no longer a good guide at least. Of course, you need an FAR that has no unacceptable defects at the frequency you are using, and if that is far above 18 GHz, effects such as atmospheric absorption need to be considered. With best wishes DESIGN IT IN! OOO – Own Opinions Only <http://www.jmwa.demon.co.uk/> www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England Sylvae in aeternum manent. From: Grace Lin [mailto:graceli...@gmail.com] Sent: Saturday, October 29, 2016 4:47 PM To: EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [PSES] Measurement Uncertainty Above 18 GHz Dear Members, Is it reasonable to request measurement uncertainty (MU) above 18 GHz? CISPR 16-4-2 Edition 2.1 seems only up to 18 GHz. Is there any standard that addresses MU above 18 GHz? Is it reasonable to claim that MU is not applicable for radiated disturbance / emission measurement above 18 GHz as there is no site validation standard available for frequency above 18 GHz? Thank you very much and I look forward to hearing from you. Best regards, Grace Lin - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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