"...if all devices were tested separately the number of observed problems during using them in sets will grow by zero, zero, nothing." Alas, The problems seem to grow by the cube of the permutations of geometric sum of triple integral of number of connections. <;-) The symptom that empty ports don't radiate much, nor do poorly terminated cables that are not plugged into previously mentioned ports, seems to manifest when those two parts are plugged together, thus the reason for "system" testing.
- Bill Indecision may or may not be the problem. --- On Wed, 4/15/09, Piotr Galka <[email protected]> wrote: From: Piotr Galka <[email protected]> Subject: Re: SV: "Quiet" Laptop To: "EMC-PSTC" <[email protected]>, [email protected] Date: Wednesday, April 15, 2009, 9:21 AM From: <[email protected] <http://us.mc01g.mail.yahoo.com/mc/[email protected]> > > > If emission at (a) and (b) are same then DUT is not the cause, else DUT is > the cause. Can't we conclude this way. Finding a quite laptop or hub seem > to be almost impossible. > If that way of concluding would be OK than also testing DUT without laptop would be OK (without don't means not connected with laptop). The idea behind testing together is that these devices will work together so the whole set should be EMC, but in my opinion that idea is only the source of a lot of problems. I believe if all devices were tested separately the number of observed problems during using them in sets will grow by zero, zero, nothing. 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] <http://us.mc01g.mai .yahoo.com/mc/[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] <http //us.mc01g.mail.yahoo.com/mc/[email protected]> > Mike Cantwell <[email protected] <htt ://us.mc01g.mail.yahoo.com/mc/[email protected]> > For policy questions, send mail to: Jim Bacher: <[email protected] <http: /us.mc01g.mail.yahoo.com/mc/[email protected]> > David Heald: <[email protected] <http:/ us.mc01g.mail.yahoo.com/mc/[email protected]> > - 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]>
