ok,ok, let's not forget how the original EMC rules got about. I heard, long ago, that during the cold war, certain listening posts had difficulty in receiving eastern european intelligence due to a german automobile factory which was causing enough interference to drown out the siganls. So, the VDE rules were born and were the first ones out. Then came CISPR 22 etc., etc.. That may be considered political but it was more out of a military intelligence point of view that EMC rules were born. Similarly, TEMPEST design rules were born when the French discovered that the British were listening to their power lines at the french embassy in UK and decoding their teletype transmissions!!! (in the 1950's!)
Best Regards Hans ______________________________ Reply Separator _________________________________ Subject: Re[4]: Shiep rules Author: Non-HP-owner-emc-pstc (owner-emc-p...@majordomo.ieee.org) at hp-boise,uugw2 List-Post: emc-pstc@listserv.ieee.org Date: 01/07/97 01:26 PM Chris, >> Here my natural cynicism comes out... In this business we all get cynical. >> The reduction in Electronic Fog in our universe is a secondary effect Here we disagree. CISPR-12 was based on actual interference tests using real people as subjects. The standard, which was essentially adopted as EN 55022, is based on technically relevant factors, not politically relevant ones. >> authorities would get far more excited if goods with CE marks were >> stopped at a border, than if the goods made too much EMI. It depends whose authorities. For example, if the computing equipment concerned were to interfere with police radio, I imagine there would be a sufficiency of excited authorities, even _with_ the CE mark. >> There's a few centimes/Deutchmarks worth... Euro's. (Or is that Euro's d'Or?) Cortland As usual, the above does not reflect opinions or policies of my employer.
