Re: Bellcore GP-1089 emissions testing: LISN test setup
Folks, The original release of GR-1089 specified a 10 uF feedthrough for conducted emissions. A subsequent revision of the document, GR-1089 Issue 2, December 1997, specified LISN's for conducted emissions in place of the feedthrough caps. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
RE: Bellcore GP-1089 emissions testing: LISN test setup
Patrick - Bypass caps were used in an older version of 1089, and subsequently replaced with LISNs in the current version. Regards, Mark Gill, P.E. EMC/Safety/NEBS Design Nortel Networks - RTP, NC, USA > -Original Message- > From: plaw...@west.net [SMTP:plaw...@west.net] > Sent: Thursday, June 15, 2000 1:35 PM > To: EMC-PSTC; t...@world.std.com; n...@world.std.com > Subject: Bellcore GP-1089 emissions testing: LISN test setup > > > I'm looking through Bellcore GR-1089 Issue 2 Revision 1 for details on the > test > setup for conducted emissions testing. > > I was under the impression that some of the measurements involved use of > large > RF bypass caps to ground, and the interference currents through the > capacitor > were measured. > While I found spec limits and test setups for current probe-style > measurements, > all the figures simply display a power input network marked 'LISN', which > I > assume to be the standard 50 ohm network. I can't find a reference that > explicitly discusses the use of an RF bypass cap. > > Could someone point me to the appropriate section? > > Patrick Lawler > plaw...@west.net > > --- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Jim Bacher: jim_bac...@mail.monarch.com > Michael Garretson:pstc_ad...@garretson.org > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > >
RE: Bellcore GP-1089 emissions testing: LISN test setup
I seem to remember the caps were specified in an earlier version of the standard, and are no longer required (issue 2, rev 1 February 1999). My understanding is that the LISN is that used for CISPR measurements. Dave Wilson Alidian Networks Inc. -Original Message- From: plaw...@west.net [mailto:plaw...@west.net] Sent: Thursday, June 15, 2000 10:35 AM To: EMC-PSTC; t...@world.std.com; n...@world.std.com Subject:Bellcore GP-1089 emissions testing: LISN test setup I'm looking through Bellcore GR-1089 Issue 2 Revision 1 for details on the test setup for conducted emissions testing. I was under the impression that some of the measurements involved use of large RF bypass caps to ground, and the interference currents through the capacitor were measured. While I found spec limits and test setups for current probe-style measurements, all the figures simply display a power input network marked 'LISN', which I assume to be the standard 50 ohm network. I can't find a reference that explicitly discusses the use of an RF bypass cap. Could someone point me to the appropriate section? Patrick Lawler plaw...@west.net
RE: Bellcore GP-1089 emissions testing: LISN test setup
Hi Patrick, The old GR-1089-CORE Bellcore Standard Issue 1, Nov.1994 required the large 10uF caps. The new standard does not require the caps. Best Regards Edward F.O'Toole Intertek Testing Services -Original Message- From: plaw...@west.net [mailto:plaw...@west.net] Sent: Thursday, June 15, 2000 1:35 PM To: EMC-PSTC; t...@world.std.com; n...@world.std.com Subject: Bellcore GP-1089 emissions testing: LISN test setup I'm looking through Bellcore GR-1089 Issue 2 Revision 1 for details on the test setup for conducted emissions testing. I was under the impression that some of the measurements involved use of large RF bypass caps to ground, and the interference currents through the capacitor were measured. While I found spec limits and test setups for current probe-style measurements, all the figures simply display a power input network marked 'LISN', which I assume to be the standard 50 ohm network. I can't find a reference that explicitly discusses the use of an RF bypass cap. Could someone point me to the appropriate section? Patrick Lawler plaw...@west.net --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
