Have you looked into using these standards whcih might provide more information. European Medical Standards: EN60601-1:1992, IEC601-1:1988 (BS5724 PART 1:1989). Emission Standards: EN55011 Emission Standards. EN500 82-1 Generic Immunity Standard. IEC 601-1-2 Immunity Collateral Medical Standard. These can be found on www.BSI.co.uk