This standard contains the German version of the European Standard EN 55103-1:2009. It specifies limits and methods of measurement for the emission of audio, video, audiovisual and entertainment lighting control apparatus for professional use. For the equipment that are covered by this standard 5 operational environments are defined. This standard covers the frequency range 0 Hz bis 400 GHz, however measurements need only be carried out in the frequency ranges, in which requirements are specified. The measurement methods are taken over by references to appropriate product family standards. In the annexes methods for the measurement of magnetic fields in the frequency range 50 Hz to 50 kHz, for the measurement of the inrush current and for the measurement of conducted disturbances at telecommunications and netzwork ports etc. are specified. The incorporated A1 modifies clauses 5 and 8 and annex B.