> But IR measures the integrity of insulation WITHOUT the > swamping effect > of capacitor current, so in fact it IS very important and should be > checked in production, as it is in periodic field testing.
Agreed that the IR test measures the insulation resistance more-or-less independent of the EMC filter capacitance. (The insulation resistance of the capacitor is in parallel with the physical insulation.) The question remains: What causes the reduction in insulation resistance? Regards, Richard Nute San Diego - 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 emc-p...@ieee.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 emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com 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 ______________________________________________________________________