I agree that switch-on is the most likely culprit in a EMC sense, and that the cooling of mitigation devices (thermistors etc) is important. I was merely pointing out that the standard specifically states: "switch off the EUT before the end of the 1 min measuring time interval" I suppose its conceivable that voltage changes could occur, it depends what a particular EUT actually does when you click the switch. Maybe contact bounce comes into it?
Steve Seller York EMC Services On 27 Feb 03, at 19:32, John Woodgate wrote: > > It's a good idea to understand what the test is intended to achieve. In > this case, it's the **switch-on** that matters. There are no EMC > implications in the sense of IEC/EN 61000-3-3 of the switch-off. > > If the EUT has, for example, an NTC thermistor to limit inrush current, > It is not only permitted, but intended, to allow it to cool down between > switch-on events. DISCLAIMER NOTICE http://www.yorkemc.co.uk/Disclaimer York EMC Services, Market Square, The University of York, Heslington, York, YO10 5DD. VAT Reg No: GB 647 2055 41 Company Reg No: 3075474 York EMC Services Ltd is a Company limited by guarantee and not having share capital. 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
