Cables, Peripherals, and Computing Equipment Progress Towards a Standard

Since the inception of the computing equipment regulations of Part 15, Subpart J, in 1979, progress has been made in defin­ ing and standardizing measurement proce­ dures. Initially, the FCC had specified in Appendix A to Subpart J measurement procedures which drew heavily on ANSI C63.4. In mid-1983, through its efforts in Docket 80-284, the FCC modified Appendix A, deleting it from the regulations and replacing it with FCC Measurement Procedure MP-4. The new measurement procedure served to better define how computing equipment should be tested. Similarly, efforts by the VDE and CISPR have produced standards directed at testing computing equipment. Procedures for evaluating radiated emissions have been embodied in VDE 0877, Part 2/2.85, and in CISPR 22. The development of these standards has gone a long way in better defining how computing equipment has to be tested.