DS DS/EN ISO 389-2
DS DSEN SO 389-2 1997-JAN-15 Acoustcs - Reference zero for the calbraton of audometrc equpment - Part 2 Reference equvalent threshold sound pressure levels for pure tones and nsert earphones
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This standard specifies reference equivalent threshold sound pressure levels (RETSPL) for the calibration of pure-tone audiometers supplementary to those specified in ISO 389.