DS DS/EN ISO 389-8
DS DSEN SO 389-8 2004-JUN-29 Acoustcs - Reference zero for the calbraton of audometrc equpment - Part 8 Reference equvalent threshold sound pressure levels for pure tones and crcumaural earphones
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This standard specifies reference equivalent threshold sound pressure levels (RETSPLs) for pure tones in the frequency range from 125 Hz to 8 kHz, applicable to the calibration of air conduction audiometers equipped with a particular model of circumaural earphones (Sennheiser HDA 200).