EN 61000-3-3Josh, EN 61000-3-3 only mentions voltage fluctuations and flicker impressed on the public low-voltage system. Inrush current is not specifically measured, although it certainly affects the amount of voltage variation caused by the Equipment Under Test (EUT).
To perform the test a controlled impedance (reference network of Fig. 1) is inserted between the ac source and the EUT. The unit is then operated normally while the voltage at the EUT input is monitored. What the test measures is the difference between the source voltage and the EUT input caused by the operation of the EUT. Washing machines and dishwashers may cause particularly nasty flicker because of solenoid valves and motor starting currents. EN 61000-4-11 does mention peak inrush current in regard to qualifying the ac source. The source must be capable of supplying more inrush current then the EUT peak inrush current (30% reserve). However, you would only need to test to EN 61000-4-11 if the appliance had electronic controls (as many do today). Although it may be possible to measure EUT peak inrush current and extrapolate the results, this would not comply with the requirements of EN 61000-3-3. Once the reference network is aquired (or built) the test is pretty straightforward. Best Regards, Scott Lacey Test Engineer (contract) EMC, Safety, Performance Verification -----Original Message----- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Joshua Wiseman Sent: Friday, August 31, 2001 2:04 PM To: Emc-Pstc (E-mail) Subject: EN 61000-3-3 Hi all, I have recently heard of a requirement in the Flicker standard for "In Rush" current measurements. My understanding of the test is that the EUT is manually turned on and off 24 times. During these times dmax is measured. You then take the highest and lowest readings and throw them out. You then average the remaining 22 readings. This has been posed to me from a customer and I can not find any supporting information other than the fact that some test equipment manufacturers are beginning to implement the testing capability in their systems. Any information on this would be greatly appreciated. Thanks in advance for all the help. Regards, Josh
