Keith, I thought of you because of previous statements that the automotive industry wasn't testing hard enough and this seemed to me a counter-example of massive unjustified overkill. My apologies, in the future I will only respond to direct postings.
Ken Javor on 1/10/02 8:52 AM, [email protected] at [email protected] wrote: Dear Ken I have no problem with "The unalterable physics of field-to-wire coupling". But I am concerned to ensure that basic physics is correctly applied in engineering issues. Can I please ask you to place any criticisms of me in the threads I am contributing to, or send them directly to me, not hide them away where I might not see them. (I hope to be able to get around to reading the week's contributions on the EMC and safety threads this weekend.) Regards, Keith Armstrong In a message dated 09/01/02 21:49:17 GMT Standard Time, [email protected] writes: Subj:FW: ISO 11452-4 Bulk Current Injection Test Requirements List-Post: [email protected] Date:09/01/02 21:49:17 GMT Standard Time From: [email protected] (Ken Javor) Sender: [email protected] Reply-to: [email protected] (Ken Javor) To: [email protected], [email protected] Scott and other EMC engineers, I looked up the referenced spec and saw it was an AUTOMOTIVE spec. And the injection level is near CONSTANT from 1 - 400 MHz, with an injection level as high as 1 Amp at the low end (1 - 30 MHz). Keith Armstrong, pay heed. The unalterable physics of field-to-wire coupling predict that this limit implies a field intensity of at least 700 V/m up to 30 MHz and at least 150 V/m and the vehicle is over 100 m long. If there are any design impacts to meeting this requirement (and I am sure there are when every penny counts) this spec is massive overkill and needs to be completely revised. Ken Javor
