I suppose Randy you are concerned about the EN-61000-3-2 instead of the EN 61000-3-3 which is concerned with Flicker testing.
Please Note that the 3-2 is currently under revision and prone to change very soon ! I would select Scenario #1 The 50 watt limit is meant to be used for all equipment, and the current document TC210-169 (in voting right now) has it's clause modified as such. Strictly read you are right about the application of scenario #2. The current 3-2 is a very bad document, f.a. nothing is said about test times and transitory effects. This will all or partly be covered in the new version. BTW Using scenario #2 it will be hard to exceed any limit at all with an active input power < 50 watt !!! Gert Gremmen ce-test qualified testing ============================== http://www.cetest.nl Do you know our CE/E mark True type Font ? http://www.cetest.nl/cettf.htm ============================== >-----Original Message----- >From: [email protected] [mailto:[email protected]] >Sent: Tuesday, January 18, 2000 7:12 PM >To: 'emc-pstc' >Subject: Harmonics Testing > > >Greetings EMC Professionals! > >I have a quick question regarding Harmonics testing to >EN61000-3-3. We have an ITE product with a switching power >supply. The product uses about 38 watts input power. According >to the standard, which scenario applies? > >Scenario #1 > >The unit does not need to be tested, because it falls below the >Class D Input power range of 75(50)W to 600W. Section 7.4 of the >standard states that "...No limits apply for equipment with an >active input power up to and including 75W...." > >Scenario #2 > >Since the unit does not use more than 75W (or more than 50W for >that matter), the unit then defaults to the Class A requirements >and therefor must meet the less stringent Class A limits. Section >5 of EN61000-3-3 states: " Class A: Balanced 3-phase equipment >AND ALL OTHER EQUIPMENT, except that stated [in Classes B-D]..." > >So I guess my question is this: when an ITE product with a >switching power supply uses less than 50W (75w), does it become an >exempt Class D Device, or doe sit become a Class A device? > >Your insights would be appreciated..... > > >Regards, > > >Randy Flinders >Chairman >Orange County Chapter >IEEE EMC Society >[email protected] >(714) 513-8012 >(714) 513-8265 Fax > >Note: The opinions expressed herein are personal and in no way >represent the position of the IEEE, The EMC Society, or my employer. >
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