Hi all, This is about the Conducted RF immunity standard IEC/EN61000-4-6.
Facts: This test shall be conducted to all power lines (AC and DC) and signal lines. The test level is usually 3V or 10V, depending on the type of product. Modulation is 80% AM and 1kHz sine. The frequency range is mainly 0.15-80MHz with frequency step of 1% and a dwell time of 3 seconds. To run a 0.15-80MHz sweep takes approximate 32 minutes (3 sec and 633 frequency steps). If you have a system/product with 10 lines connected, then you have to run the test for 320 minutes = 6 hours. Well, that is maybe not that time consuming, but if you also have to fulfil other test requirements as 400Hz AM modulation and 1Hz pulse modulation, then the total effective test time will be 18 hours. Discussion: When testing a fire alarm product for EU (CE mark) and marine marked (Wheel mark), you have to do all three modulations, 80% AM 1 kHz / 400Hz and 1 Hz pulse. The AM are pretty close in frequency, but equipment can behave different depending running 1kHz or 400Hz (someone says so..). The 1Hz pulse modulation is quite different from the AM. We had hoped to decrease the test time and wonder if we could arrange the tests another way. Could it be possible to run only 400Hz AM and 1Hz pulse with increased amplitude (maybe 16V), and thereafter argue that the equipment will pass 1 kHz@ 10V ? If so, then the test duration wound have been decreased by 33%. Time is money, in fact ... Question: Do you have any suggestions how to "modify" or combine the sweeps, in order to avoid three complete sweeps pr line? Best regards Amund Westin Oslo, NORWAY ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
