In message <6369cb70bfd88942b9705ac1e639a338220053b...@dc-us1mbex4.global.avaya.com> , dated Fri, 10 Sep 2010, "Jones, Richard (Richard)" <[email protected]> writes:
>For EMC labs: Does anyone have a method for testing Power Line Filter >performance once installed on an EMC Chamber. > >I was asked this question recently as our filters are over 10yrs old, >at the time I couldn't think of anything short of removing them to test >performance. I did wonder if some simple verification of filter current >leakage to ground would suffice as capacitors age You could certainly do that; it's a safety issue as well as an EMC issue. >but the inductors less so, ofcourse that's not checking actual >performance. The installation is visually checked and grounding >measured regularly and up until now no other thought was given to it. How about using an LISN 'backwards'? Connect the filtered supply to the EUT terminals and look at the signals on the 50 ohm output(s). If weak, either the filters are OK or there is little for them to filter anyway. In this test, the 'power input' port of the LISN is open-circuit, which is irrelevant if the internal filter of the LISN is working. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK If at first you don't succeed, delegate. But I support unbloated email http://www.asciiribbon.org/ - ---------------------------------------------------------------- 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]>
