Jdaasoc,
How does FCC testing differ from CE testing. VC820 already has CE Declaration of Conformity. The CC820 board
does not.
The plots, or graphs of allowable decibel/microvolts vs. frequency are different for CE testing vs. FCC testing (the higher the decibel/microvolts, the worse in this case because higher means more energy to interfere with television and other communication media). The allowable levels don't differ by a whole lot, and the difference is that the Europeans (CE) have tighter db limits, for example, over the frequencies where their UHF and VHF television stations transmit. Don't want computers or anything else causing interference. At frequencies where no TV, or police radio, ship to shore radio, air traffic control, or other communications deemed critical is taking place, it gets looser. Same with the U.S., i.e., we are tighter on new electronics units under test over our critical communications frequencies. Again, the U.S. and Europe don't use the same frequency bands for TV and other communications industries that are protected by FCC and CE testing. Hence the differences in the db vs. frequency graphs. Usually, a good design that passes EC will also pass FCC, and vice versa, unless you happen to be unlucky enough to be extra noisy at the critical frequency bands of one or the other. I hope everyone was designing with FCC and CE in mind all this while. I know that Intel has been careful about designing to meet EMC regulations for a long time. But with the screwups, and all the companies involved in this whole new memory technology, who knows?
Tony |
