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ASA/ANSI S3.39-2026
Specifications for Instruments to Measure Aural Acoustic Impedance and Admittance (Immittance), and Aural Acoustic Absorbance
This standard provides specifications for instruments designed to measure acoustic impedance, acoustic admittance, and acoustic absorbance within the human external ear canal. Terms that apply to these instruments and to related measurements are defined. Four types of instruments are classified. Characteristics, specifications, and recommended calibration procedures then are provided. Material within this standard is intended both for users and for manufacturers of instruments that measure aural acoustic immittance and absorbance.
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Acoustical Society of America [asa]