I thought that the default measuring distance was 3 meter, even in the 150kHz – 30MHz band.
Fra: [email protected] [mailto:[email protected]] På vegne av Gert Gremmen Sendt: 16. oktober 2008 15:44 Til: [email protected] Emne: RE: IEC 60945 & computer equipment onboard ships The limit of 24 dBuV QP should be measured with a bandwidth of 9 kHz, a combination that is not too common (I mean QP and 9 kHz BW)in measuring receivers but the newest. Alternately 30 dBuV peak may be applied, and then 9 (10) kHz is a normal setting. 60945 also requires 1-2 GHz emission testing with a BW of 120 kHz, where normal EMC standards require 1 MHz bandwidth. As a last pitfall, magnetic emissions are required from 150 KHz to 30 MHz, this requires a 60 cm loop. Fortunately (!!?!!) the standard has no test set-up requirements for this test set up, nor test distance is specified. BTW if someone has some reference sources to this rather old test method (60 cm loop: history, calibration or other), I would be obliged if he would share this with the list. Regards, Ing. Gert Gremmen ce-test, qualified testing bv Van: [email protected] [mailto:[email protected]] Namens Amund Westin Verzonden: Thursday, October 16, 2008 2:45 PM Aan: [email protected] Onderwerp: RE: IEC 60945 & computer equipment onboard ships >From IEC60945 scope: This standard specifies minimum performance requirements, methods of testing and required test results for general requirements which can be applied to those characteristics common to all equipment described hereunder: c) for EMC only, all other bridge-mounted equipment, equipment in close proximity to receiving antennas, and equipment capable of interfering with safe navigation of the ship and with radio-communications (see IMO Resolution A.813). So, ITE placed on bridge is basically covered by the standard. Be aware that radiated emission in the band 156-165MHz has a limit of 24dBuV/m. A lot of equipment fails at that point. #Amund Fra: [email protected] [mailto:[email protected]] På vegne av [email protected] Sendt: 16. oktober 2008 13:09 Til: [email protected] Emne: IEC 60945 & computer equipment onboard ships Does anybody have any experience with EMC testing to IEC 60945 ? The scope of the standard mentions that EMC requirements apply to ‘all other equipment’ (ie non-navigational or radio communication equipment). Does this cover computer equipment and if so is 60945 more onerous than CISPR 22/24 used for ITE ? The scope also mentions that radio equipment and navigation equipment be type-approved by national administrations . I presume that computing equipment not part of radio/navigation equipment does not require type approval but would be interested in hearing your thoughts on this also. Thanks for your help Brian McAuliffe Dell Products Europe - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
