Brian, You are correct that you only need to run it through one cycle, per the letter of the standard.
If this EUT does cycle often you might want to consider mitigation for customer satisfaction reasons, or if it is medical device address this in risk management. You do not need to ‘fix the problem’ of a passing result. Thanks, David Schaefer Department Manager, EMC Element Materials Technology 9349 W Broadway Ave Brooklyn Park, MN 55445, United States O +1 612 638 5136 ext. 4003 [email protected] www.element.com From: Brian Kunde [mailto:[email protected]] Sent: Friday, June 28, 2019 8:24 AM To: [email protected] Subject: [PSES] Observation Period during Flicker Emissions Test Reference IEC/EN 61000-3-3:2013 section 6.5 regarding Observation Period. The Electrical Equipment (EE) under test is NOT listed in Annex A. We are trying to make sure we are testing a product correctly. Your help would be greatly appreciated. The EE has a cycle time of about 15 to 20 minutes. Since the cycle time is greater than 10 minutes, it is my understanding that the cycle is NOT repeated to determine the Plt. So would it be correct to start up a 2-hour test, run the EE through a single cycle and then just let the EE run in standby mode for the remainder of the 2-hour test? Here is our situation. We have an EE under test that passes the 10 minute Pst limit with a value around 0.8 (1 is the limit). If we repeat the operational cycle over and over again during the 2-hour test, we again will get a Plt value of about 0.8 (limit is 0.65) and Fail. But if we run the cycle only once and then let the EE sit in standby mode for the remainder of the 2-hour test, the Plt will creep down below 0.65 and pass the test. Again, we want to make sure we are performing the test correctly according to the standard. Thanks to all for help on this. The Other Brian - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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