I would send a sample waveform to the group, but attachments cause a post to be deleted.
Doug Sent from my iPhone iPhone: 408-858-4528 Office: 702-570-6108 Email: d...@dsmith.org Website: http://dsmith.org > On Nov 4, 2014, at 23:56, John Woodgate <j...@jmwa.demon.co.uk> wrote: > > In message <54596079.8060...@emcesd.com>, dated Tue, 4 Nov 2014, Doug Smith > <d...@emcesd.com> writes: > >> Don't have a good explanation yet as I am hesitant to take apart one of the >> supplies that is the worst offender as it is the supply for a D-Link router >> I have. I am beginning to formulate possible mechanisms. But from the point >> of view of equipment, supplies that do this should not be used. I have been >> using a simple test setup (on a normal lab bench, not a standards based >> setup) that would suffice for prescreening supplies. >> >> There is some sort of discharge happening and the delay could be the time it >> takes for a discharge to form. I have been able to repeat the results with >> ESD as the stimulus in three different labs using different equipment. > > Understood. I wonder if this effect may be involved in the power > supply/charger fires that seem to be increasing in number. > -- > OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk > Quid faciamus nisi sit? > 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 > <emc-p...@ieee.org> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used > formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher: <j.bac...@ieee.org> > David Heald: <dhe...@gmail.com> > - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
