In message <[email protected]>, dated Mon, 17 Dec 2007, Bharathkumar Raju <[email protected]> writes:
> I feel EN61000 - 4 - 2 is an over kill for assessing the ESD >immunity level of a device. You COULD be right, but I don't think there is much corroborating evidence. >An USB device with a CCD type sensor is repeatedly failing in the lab >testing conducted as per the standard and as per sensor manufacturer's >recomendations. Well, if it doesn't pass the manufacturer's own recommended tests... >On the other hand the sensor manufacturer claims that millions of >sensors are deployed in the field for more than a year and absolutely >no field returns on ESD account. Perhaps they are sold only in low-latitude countries. If they get to Canada and Scandinavia, where ESD voltage can be much higher, failures are much more likely. >The lab results are not at all matching with field results calimed by >the sensor manufacturer. See above; that can perhaps be explained. >As a product certification engineer, I am confused whether to give the >go ahead to my company for the mass production. If you are selling the product in Europe, you don't actually need to use EN 61000-4-2, but you have to explain why not in a VERY convincing way, and you can't claim compliance with the product standard (EN 55024?) that calls up EN 61000-4-2. > I look for the members advise >a. Do you see a reasonable match between the EN 61000 - 4 - 2 lab >test results and field results. If mismatches were common, there would be demands to change the standard. However, it is true that we only know for sure that the standard's requirements are sufficient to prevent field problems, not that they are necessary. >b. Is there any other standard that you feel better than EN 61000 - 4 - >2. See above; for Europe you have a difficult task if you don't use the EN. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk For very important information, please turn over. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
