Hi Barbara and group, Unlikely means that the equipment has no variations in power supply current, or variations that cause voltage fluctuations are below the most stringent level in the standard. Just evaluate the (Imax. - Imin. = Idifference) RMS-current during a full operating cycle and compare to the required level (after multiplying with the reference impedance).
If you want to dig further in it you can make a conservative estimation of the number of variations per minute. Take the highest (fastest) value you can find, and compare to the appropriate entry in the flicker table. In general: - equipment with a power consumption below 100 VA max is unlikely to create flicker problems. - Most equipment under 500 VA will not create flicker problems - Many equipment over 500 VA will create flicker problems only if switching full load on and off in a rhythm faster then once per second - Equipment over 1000 VA that has switching cycles is likely to cause some form of flicker and certainly needs evaluation. Beware of the new requirement for in-rush current though !!!! 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: owner-emc-p...@ieee.org [mailto:owner-emc-p...@ieee.org]On Behalf >>Of Brooks, Barbara >>Sent: Tuesday, September 12, 2000 4:10 PM >>To: EMC Post >>Cc: joe.ross...@avocent.com >>Subject: EN 61000-3-3 >> >> >> >> >>Does any one have any information regarding how you determine if equipment >>will not product significant voltage fluctuations or flicker with out >>performing the tests of EN 61000-3-3 per Paragraph 6.1? >> >>EN 61000-3-3 Paragraph 6.1 states "Test shall not be made on >>equipment which >>is unlikely to product significant voltage fluctuations or flicker." >> >> >>Barbara Brooks >>Wyle Laboratories >>7800 Highway 20 West >>Huntsville, AL 35807-7777 >>(256) 837-4411 ext 595 >>(253) 721-0144 Fax >>bbro...@hnt.wylelabs.com >> >> >>------------------------------------------- >>This message is from the IEEE EMC Society Product Safety >>Technical Committee emc-pstc discussion list. >> >>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: >> Jim Bacher: jim_bac...@mail.monarch.com >> Michael Garretson: pstc_ad...@garretson.org >> >>For policy questions, send mail to: >> Richard Nute: ri...@ieee.org >> >> >> >>
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