Martin Amendment A1, 1995, to EN55022:1994 states:
"In the case of Printed Wiring Board Assemblies (PWBA), separately marketed for the enhancement of diverse host units, the PWBA (e.g. ISDN interface, CPU, adaptor cards, etc.) shall be tested in at least one appropriate representative host unit of the PWBA manufacturer's choice so as to ensure compliance of the PWBA with the entire population of hosts in which it is intended to be installed." So according to the standard, the required minimum number of hosts in one. I believe that one is sufficient, especially where you have no idea what computer the end user will have. I would always check the Emissions from support equipment before adding an adaptor card, as combining CE marked computers,monitors, keyboards etc. does not always produce a combination that is still meets class B limits ! Charlie Blackham x31592 Approvals Engineer Madge Networks Limited
