Ed, I'll state right the outset that this e-mail does not answer any of your questions. I am only commenting on the test request. It really sounds to me like your customer wants to perform the automotive equivalent to the conducted immunity test of EN 61000-4-6. The ideal candidate for the frequency range (presumed 150kHz to 80MHz) is the stripline test of ISO 11452-5. The severity test levels can be correlated with free-field according to Annex B of this standard (correct for 150mm stripline) I prefer the Bulk Current Injection (BCI) test method of ISO 11452-4 for equipment in plastic enclosures for reasons of the effects of fringe fields from stripline plates near the EUT. Unfortunately, the ISO standard specifies a 1MHz lower limit on the frequency range. Applying the ISO 11452 group of immunity standards offers your customer compliance with the radiated immunity requirements of automotive directive 2004/104/EC. Another test that could apply is the audio-frequency coupled noise immunity test of SAE J1113 SEP96 Sec 2 specified for 30Hz to 50kHz. The worst severity level I have received in a customer specification is 3V pk-pk for a piece of equipment specified for 100V/m immunity ( free-field). I just wonder if this is a case of the wrong standards - albeit more "familiar" ones - being applied to a product. Rgds - Chris O.O.Only.
From: [email protected] [mailto:[email protected]]On Behalf Of Price, Ed Sent: 21 February 2006 15:13 To: [email protected] Subject: EN61000-4-6:1996 I have been asked to do a Conducted Immunity test per BS EN61000-4-6:1996 on a gadget that mounts on the inside wall of a bus (and is accessible to the passengers). First, I think this isn't the latest version of this specification, but it is what the customer requested. This device has a completely non-conductive outer case. The only conductive point is on it's rear, where a 15-pin "D" connector supplies vehicle power through a shielded, twisted-pair cable. The customer asked for a "direct connection" test, as shown in Figure 2a, with a test level of 20 Volts. It seems to me that I will need to be able to generate about 100 Vpp and 200 Watts from my RF amplifier. Does the requested test level seem a bit extreme for a passenger bus application? Further, I don't understand how to measure the voltage Uo. Is this the voltage across the output of my 50-ohm RF source, or the voltage from the test specimen injection point to ground? And finally, Figure 2a implies a conductive test specimen case. How do you do this test for a non-conductive case, where the only conductive surface available is the length of the shielded power cable? I'd appreciate any comments or guidance. Regards, Ed Price [email protected] WB6WSN NARTE Certified EMC Engineer & Technician Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military & Avionics EMC Is Our Specialty - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
