Gary, in answer to your comments: >I would appreciate some skull scratching here, but preferably can >someone provide the FCC/CISPR citation on this point. >I have spent an interesting amount of money testing big name devices >looking for very quite support equipment.
FCC part 15.31(i) requires that the peripherals be unmodified, commercially available devices. ANSI C63.4 section 11 defines the minimum system configuration for computer peripherals and clearly shows, in section 6, the host PC and accompanying peripherals located on the test table. The last amendment to CISPR 22 (A2) began to align CISPR 22 with ANSI C63.4 such that it defines minimum system configurations for PC-type products. >Equally important in this argument is that you cannot identify through >test identify a non-complying signal as belonging to the support >equipment rather than the EUT and then claim compliance. >This concept has been stuck in my head for many years, probably dating >back to the earliest MP-4 documents and part 15 regulations. I vaguely >associate it with the sections that described peripherals to exercise >equipment and what was or was not acceptable. ANSI C63.4 (1992) section 6.1.2.1 (which discusses the use of remote support equipment under certain circumstances) clearly indicates that the purpose of the test is to evaluate "...the interference potential of the EUT, its accessories, and interconnecting cables or wires apart form the remotely located device...". This would suggest that the combination of EUT and local support equipment must meet the limits, i.e. you cannot switch off the support equipment. >Obviously, I would prefer to win this argument but on the other hand it >sure makes the search for peripherals that meet my needs a lot easier. Hope this doesn't add more fuel to the fire ! Mark Mark Briggs [email protected] --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], or [email protected] (the list administrators).
