I do not understand how y-caps can "arc", as most Y2-rated caps that I have tested will withstand 3kV di-electric and 4kV surge/EFT.
Was the arc to the cap or to the lead or PCB trace ? I have also note that the resultant voltage from some primary components to gnd/chassis can much greater than the induced transient due to test config and probe placement. luck, Brian > -----Original Message----- > From: [email protected] [mailto:[email protected]]On Behalf Of John > Woodgate > Sent: Thursday, October 19, 2006 1:17 PM > To: [email protected] > Subject: Re: SMPS power supply type test and manufacturing test > dielectric values > > > In message > <[email protected] > m>, dated > Thu, 19 Oct 2006, McInturff Gary <[email protected]> writes > > >The actual problem I?m having is that the line to ground > capacitors on > >the pcb are blowing up at the figures the test house gave me > and which > >are significantly higher than what I indicate above. > Unfortunately they > >also arc during the surge testing at 2Kv and die there as well. > > Are you sure they are proper Y-type capacitors complying with IEC > 60384-14? It should be easy to check, and if they are wrong > it could be > a much quicker solution than delving into exactly what test > voltages are > required. > -- > OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk > Swine wave - a waveform whose spectrum is exceptionally > difficult to calculate. > John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
