DS DS/EN ISO 389-1
DS DSEN SO 389-1 2000-APR-27 Acoustcs - Reference zero for the calbraton of audometrc equpment - Part 1 Reference equvalent threshold sound pressure levels for pure tones and supra-aural earphones
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This standard specifies a standard reference zero for the scale of hearing threshold level applicable to pure-tone air conduction audiometers, in order to promote agreement and uniformity in the expression of hearing threshold level measurements throughout the world.