John, From: "John Woodgate" <[email protected]> > > Formally, you are 'gold-plating' the standard - extending beyond its > internationally-agreed requirements. You should make a proposal to amend > the standard in accordance with your view, so that it can be tested in the > proper forum. > How I should understand the current standards (EN55022, EN55024) ? How the conducted disturbance at mains terminals of 12V DC powered device should be measured: 1. At its 12V DC input ? 2. At mains input of "standard" 12V (buffered) supply (the same problem as with "standard" PC) ? 3. Not measured at all as device has not mains terminals ?
The same question regarding immunity: At DC input or at AC input of "standard" 12V buffered supply. The same "standard" supply used several times can fail Surge sometimes - what then. Should I use each time new "standard" supply and then WEEE it as used equipment ? When I was speaking (my first attempt to EMC) with one accredited lab (in 2002) they said I have to come with "standard" supply because they have no supply to destroy it for my measurements. When in 2004/2005 I've done some measurements (one firm's lab) they just measured at DC input (they also produce a lot of 12V powered devices and measure them that way). Best regards Piotr Galka - 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]>
