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____________________Reply Separator____________________
Subject:    RE: EN 61000-3-3
Author: "Rosswog; Joe" <joe.ross...@avocent.com>
List-Post: emc-pstc@listserv.ieee.org
Date:       9/12/00 2:00 PM

Gert,

Thank you for the definitive answer, but what do you mean by "Beware of the
new requirement for in-rush current though !!!!"?

Joe Rosswog

> -----Original Message-----
> From: Gert Gremmen [SMTP:cet...@cetest.nl]
> Sent: Tuesday, September 12, 2000 1:15 PM
> To:   Brooks, Barbara; EMC Post
> Cc:   joe.ross...@avocent.com
> Subject:      RE: EN 61000-3-3
> 
> 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
> >>

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