BS EN ISO 389:1997
Withdrawn Date published:
Acoustics. Standard reference zero for the calibration of pure tone air conduction audiometers
Specifies reference equivalent threshold sound pressure levels for Beyer DT 48, telephonics TDH 39 earphones in a coupler complying with IEC 60303 and supra-aural earphones, meeting stated requirements, in an artificial ear complying with IEC 60318.
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