Hi Steven The function of the ferrites to prevent noise to enter the site is just one side of the story. One equally important aspect is presenting a fixed Common Mode impedance (150 Ohm approx)to the interference current sources that drive the cables and to create a fixed radiating cable length. Both for reproducibility. One will definitely find less resonances due to cabling using the CISPR set up both down- and upwards as using the ANSI set up. Therefore I suggest to re test.
Gert Gremmen ce-test, qualified testing http://www.cetest.nl -----Original Message----- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Steven Goulding Sent: dinsdag 20 augustus 2002 19:03 To: jim.hulb...@pb.com; emc-p...@ieee.org Subject: Re: EN 55022:1998 vs. ANSI C63.4 The idea of putting the ferrites on the cables is to prevent noise from outside the test site form entering the test site. My opinion is that you should not have to repeat the test as the ferrites do not have any effect on what is happening in the room where the test is being performed. Just one mans opinion. Steven ----- Original Message ----- From: <jim.hulb...@pb.com> To: <emc-p...@ieee.org> Sent: Tuesday, August 20, 2002 9:16 AM Subject: EN 55022:1998 vs. ANSI C63.4 > > Probably won't get many responses this week as everyone with a travel > budget is now in Minnesota. However, I'll try it anyway. > > In the 1998 version of EN 55022, radiated emissions tests on table top > products are performed with a ferrite tube or clamp on each cable that > exits the test site (i.e. AC mains, telecom, I/O to remote control units). > ANSI C63.4 does not specify this. If I follow the EN 55022 procedure, is > it necessary to repeat without the ferrite clamps in order to satisfy the > ANSI test procedure? > > Thanks. > > Jim Hulbert > Pitney Bowes > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > 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: > Ron Pickard: emc-p...@hypercom.com > Dave Heald: davehe...@attbi.com > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > http://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
