I believe the total power consumption of a system permits higher limits only if the product is tested against class D limits, which as of 1 January 2001 will only apply to personal computers, personal computer peripherals, and television receivers (assuming the proposed amendment to EN 61000-3-2 is published in the OJ before the end of the year). Most other equipment will fall under class A limits which have a set limit at each harmonic that is not dependent on the power consumption. I don't think a system that falls under class A would be more likely to pass than the individual components of the system.
Jim Hulbert Senior EMC Engineer Pitney Bowes "CE-test - Ing. Gert Gremmen - ce-marking and more..." <[email protected]> on 11/27/2000 04:13:47 PM Please respond to "CE-test - Ing. Gert Gremmen - ce-marking and more..." <[email protected]> To: [email protected], [email protected] cc: (bcc: Jim Hulbert/MSD/US/PBI) Subject: RE: Testing as a system for harmonics? Normally it is more easy to pass a harmonic test when connected as a system, then when tested as several separate apparatuses. I do not understand your "obvious it failed" statement ... The total power consumption of a system permits higher limits, and some peak values of harmonic currents at specific harmonics tend to average over several different equipment, so no failure due to one specific peak. However if each of you separate equipment parts were below 75 watts... and the total is above....... I guess you should offer them for separate testing. It's against the spirit of the new requirements ..... or not ! Regards, Gert Gremmen, (Ing) ce-test, qualified testing =============================================== Web presence http://www.cetest.nl CE-shop http://www.cetest.nl/ce_shop.htm /-/ Compliance testing is our core business /-/ =============================================== >>-----Original Message----- >>From: [email protected] [mailto:[email protected]]On Behalf >>Of [email protected] >>Sent: Monday, November 27, 2000 7:19 PM >>To: [email protected] >>Subject: Testing as a system for harmonics? >> >> >> >>One of our products is sold as a system with several other non-connected >>products as well as a computer system and printer. We brought this product >>to a well known EMC Testing facility to perform Harmonics testing. They >>required that we plugged our product, as well as all of the peripheral >>devices, into a power strip and they then tested the complete system >>together for Harmonics. Obviously, it failed. >> >>Has anyone else had an EMC Lab make this request of testing the complete >>system? Is anyone aware of any document that requires system testing for >>Harmonics? >> >>All responses are appreciated. >> >>Regards >> >>Joe Martin >>EMC/Product Safety Engineer >>[email protected] >> >> >>------------------------------------------- >>This message is from the IEEE EMC Society Product Safety >>Technical Committee emc-pstc discussion list. >> >>To cancel your subscription, send mail to: >> [email protected] >>with the single line: >> unsubscribe emc-pstc >> >>For help, send mail to the list administrators: >> Jim Bacher: [email protected] >> Michael Garretson: [email protected] >> >>For policy questions, send mail to: >> Richard Nute: [email protected] >> >>
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