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 r.flind...@ieee.org (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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