I read in !emc-pstc that Gert Gremmen <[email protected]> wrote (in <[email protected]>) about 'EN55022:1998 + A1:2000' on Wed, 29 Jan 2003:
>Proposals are on their way to specify >both transfer attenuation (first) and >input CM impedance of those clamps (later) >The radiation properties of the exposed wire will >vary widely depending on the CM load impedance. >The attenuation characteristic is to isolate >auxilary wire (and signal) from the test setup. When we discussed this in the UK committee, it was pointed out that this clamp is NOT a filter and its transfer attenuation is irrelevant. It is *intended* to absorb energy propagating down the cable, so it is the *input impedance* that matters. AIUI, even though that is so, because CISPR/I (G?) specified a transfer attenuation, CISPR 16-1 will continue to specify a value for this irrelevant property! -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! 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: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
