>> "...if all devices were tested separately the number of observed problems during using them in sets will grow by zero, zero, nothing." > Alas, > The problems seem to grow by the cube of the permutations of geometric sum of triple integral of number of connections. <;-) > The symptom that empty ports don't radiate much, nor do poorly terminated cables that are not plugged into previously mentioned ports, seems to manifest when those two parts are plugged together, thus > the reason for "system" testing. As I know if device is tested alone all its ports (or at least one of each type) should be connected by cables with right auxiliary equipment and working. Did I miss something that allows for testing without these connections ? If the emission of (for example) USB hub will be tested by connecting it with PC and four USB devices being located out of measurement room (and hardly working) and pass than I expect using that hub with other system elements (tested the same way) will rise the same number of observed by user EMC problems than if the hub was tested by "system" testing. That is what I have written. Regards Piotr Galka -
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