For our Harmonics and Flicker verification I perform the following: Harmonics: Using a large value capacitor (47uF or greater) place it across the AC output of the reference power source. Then evaluate the individual harmonic currents it generates month over month to ensure there are no changes. While this does not cover all of the harmonics, you will be able to verify the system is still providing accurate results. A base case immediately after calibration is the best place to start. Flicker: This is quite simple using a programmable power source. Lower the output voltage and observe the Dmax reading changes by the programmed voltage drop: i.e.: 230V nominal, drop the output voltage to 220.8V and the Dmax should be 4%. For the Pst, you can set voltage drops/step functions at the rates called out in the Flickermeter design specification. That is, 2.72% drop/change at once per minute will yield a Pst of 1 after 10 minutes; a 2.21% voltage drop/change at 2 times per minute will yield a Pst of 1 after 10 minutes. I should clarify: Start the test After 1 minute drop the voltage by 2.72% 1 minute later return the voltage level to the original value 1 minute later drop the voltage again Continue for 10 minutes Same thing for the other voltage changes/ rates. I perform these verifications monthly. Hope that helps regards David Spencer Xerox Corp.
From: [email protected] [mailto:[email protected]] On Behalf Of Wiz Sent: Friday, January 09, 2004 11:21 AM To: EMC Forum Subject: Verification Procedures Hi everyone... I am trying to create a verification procedure for EN 61000-3-2 and -3-3. I am not sure how to go about it. For emissions I use a standard noise source which is very reliable. However I am not aware of any standard that may exist for verifying the test equipment and software. Can anyone share what they do to verify their test equipment and software? Thanks, Wiz
