ASA S3.22-2024 PDF

This standard describes measurement methods for air-conduction hearing aids suitable for specification and quality testing purposes. Test methods described include output sound pressure level with a 90 dB input level, full-on gain, frequency response, harmonic distortion, equivalent input noise, current drain, and induction-coil sensitivity. Tolerance limits in relation to values specified by the manufacturer are also provided for these parameters. A normative annex describes calibration of the sound source. Informative annexes provide information about magnetic field generation, characteristics of battery simulators, additional tests to evaluate the electroacoustic performance of hearing aids, and information about measurement uncertainty for quality assurance.