Acoustics. Reference zero for the calibration of audiometric equipment - Preferred test conditions for the determination of reference hearing threshold levels shop-only use of specific inspection bodies

use of specific inspection bodies and discriminatory certification systems or import licenses

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thus simulating application conditions where the transducer is exposed to multi-axial vibration

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Acoustics. Reference zero for the calibration of audiometric equipment - Preferred test conditions for the determination of reference hearing threshold levels shop-only use of specific inspection bodies1 Scope This part of ISO 389 specifies test conditions for determining the hearing thresholds of subjects for the purpose of establishing standardized values for reference hearing threshold levels.