J Alexander <[email protected]> wrote: Robert, If that could be done in every application you would never see shielded I/O cables, ferrites clamps, line filters, etc. Those products exist because there is a business case to support using them instead of "curing the disease" so to speak. A lot of compliance engineers have difficulty understanding there is a business side to what we do and solving the problem at the source is always not the best solution . Cost and time to market will have a much bigger impact on your product's success versus coming up with the most ingenious fix to mitigate an EMI problem. We should assume that Dan probably has already done his home work and is focusing more on a time to market solution instead of obtaining technical achievement. Dan A: You may want to try a vendor in Mt.View CA called Sima Electronics. They specialize in 11th hour compliance solutions. ( 650)-965-4000 Alex James Robert Wilson <[email protected]> wrote: In other words you are suggestion to cure the disease itself, and not just the symptom.
Bob Wilson TIR Systems Ltd. Vancouver. -----Original Message----- From: JP Hare [mailto:[email protected]] Sent: June 13, 2002 4:50 AM To: Anchondo, Dan; [email protected] Subject: RE: Shielded DC Power Cable Vendors Hi Dan, I saw your previous post and was wondering if it would receive any attention. As I recall, you are trying to shield a 200A DC power cord. I am assuming you want a shielded cable because of radiated EMI problems. Usually shielded power cords are not theoretically sound solutions for EMI reduction. Do you control BOTH ends of this cable? I imagine you control the EUT end, but allow the other end to be connected to the standard CO power bus. If this is true, then you are essentially extending the noisy cable to the bus bar and into the CO's power system. The RBOC may have a problem with this. If you have considered this and you still believe that a shielding strategy is acceptable for you, you may want to make your own shield from flat braided ground strap. I've seen certain types that "open" up into a tube. You may be able to fit this around your cable assembly. Obviously the best solution is to filter the energy. But I realize that finding and implementing a 200A filter could be a bit difficult! A closer look at the DC-DC converters may be necessary... Good luck, Paul Hare [email protected] --------------------------------- Do You Yahoo!? Sign-up for Video Highlights of 2002 FIFA World Cup --------------------------------- Do You Yahoo!? Sign-up for Video Highlights of 2002 FIFA World Cup
