DIN EN ISO 11904-2:2005-02

DIN EN ISO 11904-2 specifies a basic frame work measurement method for sound immissions from sound sources placed close to the ear. The measurements are carried out with a manikin, equipped with ear simulators including microphones, as specified in ITU-T P.58. The measured values are subsequently converted into corresponding free-field or diffuse-field levels. The results may be given as free-field related or diffuse-field related equivalent continuous A-weighted sound pressure levels. The technique is denoted manikin-technique. DIN EN ISO 11904-2 may be applied to exposure from sources close to the ear, for example during equipment tests or at the work place by e. g. earphones or hearing protectors with audio communication facilities.