Gary - That story is quite old - I think I predates MP4!! Best Regards Charles Grasso Compliance Engineer Echostar Communications (w) 303-706-5467 (c) 303-204-2974 (t) [email protected] (e) [email protected] (e2) [email protected]
-----Original Message----- From: Gary McInturff [mailto:[email protected]] Sent: Friday, September 05, 2014 11:38 AM To: [email protected] Subject: Re: [PSES] Failure of Radiated emission Exactly. In fact before the "standard" setup the worst case setup would mean an examination of permutations. A system of 6 devices could have a million test configurations. A,B,C,D,E,F - A,C,D,E,F,B - A,C,D,E,B, F ad nausium. And a strict interpretation of that could mean that you do if for multiple frequencies of concern. From these types of problems rose the "standard" setup, including the infamous scrolling "H" pattern. Even the standard setup was abused by some. A consultant friend of mine was once called to the FCC site in MD because the FEDS had determine the system non-compliant for some reason. The standard setup includes the phrase (I believe) for typical usage. The consultant arrived at the test site were the FEDS had already set up the system. The first thing he notices was the the FED's (FCC) test engineers had wrapped the 6 foot keyboard cable around the monitor a couple of times. One had to look through the cabling to see what was actually on the screen. Yup th! at's pretty typical of how people use computers. Heavy sigh. Fun to laugh at now - but getting the point at which we now find ourselves has had some very strange interactions with regulators and laboratories - and yes design engineers. Gmac Gmac -----Original Message----- From: dward [mailto:[email protected]] Sent: Friday, September 05, 2014 9:16 AM To: [email protected] Subject: Re: [PSES] Failure of Radiated emission One of the reasons, many years ago, that a 'standard' setup was determined in both CISPR and ANSI standards was to relieve the never ending always present constant manipulation of cables and equipment. While the EUT is to be operating in a typical use scenario, the setup should be as depicted in the standard. This includes cables being bundled correctly, draped correctly and arranged on the test table correctly. Variation of this setup goes back to the 1980s when the constant equipment variations. Let's not go back there. Dennis Ward This communication and its attachements contain information from PCTEST Engineering Laboratory, Inc., and I sintended 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. -----Original Message----- From: Carpentier Kristiaan [mailto:[email protected]] Sent: Friday, September 5, 2014 7:36 AM To: [email protected] Subject: [PSES] Failure of Radiated emission Hi group, A ITE product is tested to EN55022 Radiated emission with a well defined setup (cables, traffic, etc...) trying to find the worst case emissions and it passes. I think finding the real worst case emission for all frequencies with one and the same set-up is in practice not possible in practice. That same product is retested by a customer or in case of market surveillance campaigns, then it is most likely not tested with the same set-up and results may fail. Would this be an issue or is it acceptable that it is retested with the same set-up as the initial testing? I refer to CISPR22, clause 8.4 that states that the operational conditions of the EUT shall be determined acc. to typical use.....The operat mode and rationale shall be stated in the report. So to me it looks sufficient to test a typical set-up, do your best to not make it best case and describe everything in the report. Any other thoughts? Best regards, Kris Carpentier - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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