I read in !emc-pstc that Christian Martà <[email protected]> wrote (in <[email protected]>) about 'CONDUCTED NOISE 2kHz-20 kHz STANDARDS', on Tue, 4 Sep 2001: > 1) Does anyone know if there is a European Standard (or national > standard), which limits the level of conducted noise in these range > of frequencies (2 kHz.20 kHz) ?
Not yet. The subject is under study in IEC. >(I am used EN55011,....were all these standards start at 150 kHz, however do > not to work with EMC EN55011,....were all these standards start at 150 > kHz, however do not mention anything about lower frequencies. > Also if we talke about the harmonics usually stop at the 40th > harmonic (2kHz), so is there a gap of frequencies?). Yes. 2 to 9 kHz. > > 2) How these range of frequencies could be filtered ? (standard EMC > filters start usually at 100 kHz, and Harmonic filters are just for > that, "harmonics") That's one of the problems. Filter capacitance values have to be so high that their power-frequency current draw is not negligible, and don't even THINK about the leakage current involved in attenuating common-mode noise in this frequency range. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co..uk Eat mink and be dreary! ------------------------------------------- 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: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
