I have to agree with Peter - just because it passes in one band doesn't mean it will pass in another. For argument's sake in one instance, consider the loop area of a signal and it's return - it's effective at specific frequencies/frequency bands. Also consider why the new standard(s) added the higher frequency range - perhaps there were reports of/or concerns that products compliant at 800-1000 are now failing when in proximity to products emitting in the 1-2GHz range. Can't see the argument against testing. John Juhasz Fiber Options Bohemia, NY
-----Original Message----- From: FLOWERDEW, Peter [mailto:peter.flower...@plantronics.com] Sent: Thursday, January 10, 2002 10:07 AM To: emc-p...@majordomo.ieee.org Subject: RE: RF immunity 1-2GHz I have been 'hardening' headsets and amplifiers to meet the 80 to 1000MHz, 1KHz 80% AM modulation requirements in EN55024, 3V/m. As our product lives on peoples desks we undertook to also provide immunity to mobile phones. We covered 900MHz, 1.8GHZ, 1.9GHz and 2.45GHz switched key modulation at 200Hz 1/8 pulse ratio, 10V/m to 3V/m. These higher frequency tests were MUCH more difficult to meet than the regulatory ones. The response of a system to signals in any particular frequency band just can not normally be predicted from the response to those in some other frequency band. Regards, Peter -----Original Message----- From: am...@westin-emission.no [ mailto:am...@westin-emission.no <mailto:am...@westin-emission.no> ] Sent: Thursday, January 10, 2002 11:07 AM To: emc-p...@majordomo.ieee.org Subject: RF immunity 1-2GHz RF immunity testing in the frequency range 80-1000MHz has been common in EU for several years. Now, new standards also include testing in the 1-2GHz band (3V/M or 10V/m, 1kHz sine, 80% AM) We have done a lot of testing in the 80-1000MHz band and quite often the EUTs failed. We have also done some testing in the 1-2GHz band, but never managed to disturb the EUTs in that manner so it fails (10V/m). What is your experience with RF immunity testing in 1-2GHz band ? Do the EUT fail? On one specific product we have tested 80-1000MHz (no failure) and emission testing 30-1000MHz (almost quiet, 20 dB margin). With these two tests performed, is it possible to assume that we will pass the immunity 1-2GHz test ? The answer might be, test it and verify, but we would like to argue that this test is not necessary to conduct, because to our previous experience with RF immunity. Many of your might not like this approach ..... so be aware, this is just a question. 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/ <http://www.ewh.ieee.org/soc/emcs/pstc/> To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
