In message <002201c9bd95$cd769fd0$6863df70$@dk>, dated Wed, 15 Apr 2009, Kim Boll Jensen <[email protected]> writes:
>We have seen another problem when testing for CISPR 22 conducted on >teleports, where a laser printer attached to the EUT was 20 dB over >limit. Putting any other Ethernet device on the EUT port reduced the >emission by 15 dB or more. But maybe that laser printer with another EUT would not produce such a large emission. Three is no practicable way to tell. > >We are satisfied if our customers can make a setup which pass the limit >with a CE/FCC marked peripheral device and just note in the report what >was attached the EUT. I don't see this as a world-wide problem to pass >new products with old products attached, I think it is a problem. If I test my peripheral product with an old computer, but the market surveillance authorities test it with a modern one and it fails (maybe 20 dB over the limit!), the very least problem I have is to convince the authorities that my testing was sufficient to meet the requirements of the Directive. >I think the problem is that there are a lot of non-compliance products >out there. But how do you know, if a peripheral can pass with one computer but fail with another? That problem would disappear if we had a 'reference computer' for compliance testing. Incidentally, its development might throw some light on why there can be such a large variation between one combination of computer and peripheral and another. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Things can always get better. But that's not the only option. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]>
