Hi Gordon (and John) This is a good example of a recent standard created by IEC with stupid mistakes in it and voted by CENELEC without thinking. While for conducted immunity the frequency boundaries are defined (6.2 4th par) , for radiated immunity they are not. One may argue that the this way one should comply with a defined range in EN 61000-4-3 (most recentversion : as undated in table 1) and automatically cover extended frequency ranges as the standard updates, but EN 6100-4-3 is not harmonized (basic standard)! It's the product standard (so EN 61326) that should list frequency ranges, and corresponding limits. Limits without frequencies are without meaning.
(By absence of defined boundaries one should fall back to the Directives text, and the EMC directive covers the range 0 - 400 Ghz. So now we should take the measurement set up from 6100-4-3 and measure up to 400 GHz. Ridiculous) This standard was voted upon and no-one noticed the omission. I must admit that it has passed my desk, without me noticing either. I suggest that you use your common sense, and perform the test as defined in the EN 50082-1:1997 (generic standard; harmonized) UNLESS you have the feeling that your product might fail in proximity of DEC and GSM signal at 1800 Mhz or other suitable signal sources above 1 Gig. Due diligence: you know ? Another stupid point: While stating that the product must remain safe as a result of applying the standard, it does not require that it is safe during the application of the test. (page 23) In additon to that a new environment has been defined (page 35) Controlled EM environment. Stupid as i am I was thinking that it means that some shielding might be present. No, it means that cellulars are prohibited. Who knows such a test lab ? And who would comply ! Several limits have been relaxed because engineers are used to interpret deviant behavior of equipment when using the cellular ! No word about safety: engineers are used to dangerously operating test equipment and are resistant to electrical shocks and other hazards. Table B1 is allowed for any laboratory, including f.a. biomedical where no-one has read the electrical code...! To my so humble opinion, this table is there just as an escape route for non compliant equipment. Who cares about immunity anyway ! Gert Gremmen ce-test -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Gordon,Ian Sent: Friday, September 27, 2002 1:47 PM To: 'IEEE EMC & SAFETY PSTC' Subject: RADIATED IMMUNITY TESTING ABOVE 1GHz Everybody Does anyone know whether it is necessary to perform radiated immunity tests above 1GHz when applying BS EN61326 which is the product standard titled "Electrical equipment for measurement, control and laboratory use - EMC requirements"? The products concerned are not telecom or IT devices. The standard refers to IEC 61000-4-3 for this testing which includes tests above 1GHz at various mobile telephone frequencies. I believe the generic standard EN61000-6-2 refers to testing using pulsed modulation at 900MHz only. Thanks Ian Gordon _____________________________________________________________________ This e-mail has been scanned for viruses by the WorldCom Internet Managed Scanning Service - powered by MessageLabs. For further information visit http://www.worldcom.com ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ 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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ 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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
