IEC 60118-0:2015

Overview

IEC 60118-0:2015 is an internationally recognized standard developed by the International Electrotechnical Commission (IEC) that specifies procedures for measuring the performance characteristics of air conduction hearing aids. This third edition supersedes previous versions dating back to 1983 and consolidates multiple amendments and related parts into a comprehensive, technically revised document. The standard provides detailed recommendations for evaluating hearing aid performance using acoustic coupler measurements in a controlled free field environment. Its primary focus is on defining precise and repeatable test methods to ensure hearing aids meet quality, consistency, and functional requirements.

Key Topics

• Measurement Techniques: The standard outlines the acoustic test method, emphasizing the use of acoustic couplers and free field techniques to assess hearing aid output reliably.
• Test Environment: It defines the necessary test enclosures, sound sources, and measurement systems to reduce unwanted stimuli and ensure accurate sound pressure level (SPL) readings.
• Frequency Response: Procedures for obtaining frequency response curves, including OSPL90 (output sound pressure level at 90 dB input) and full-on gain measurements, are specified in detail.
• Distortion & Noise: Methods for measuring total harmonic distortion, intermodulation distortion, and equivalent input noise ensure hearing aids deliver clear and undistorted sound.
• Electrical Input Characteristics: The standard addresses input impedance and sensitivity requirements for hearing aids, particularly those equipped with electrical input circuits and induction pick-up coils.
• Battery & Supply Voltage Considerations: It details how variations in battery voltage affect hearing aid performance metrics like gain and distortion.
• Directional Hearing Aids: Specific test configurations and measurement setups for directional hearing aids are included to capture their unique acoustic behaviors.
• Additional Optional Tests: Includes assessments for tone and gain control effects, AGC (automatic gain control) characteristics, and measurements with ear simulators per IEC 60318-4.

Applications

IEC 60118-0:2015 serves as a crucial reference for manufacturers, test laboratories, and regulatory authorities involved in the development, certification, and quality control of hearing aids. Its applications include:

• Hearing Aid Development: Providing engineering teams with standardized methods to evaluate and optimize hearing aid acoustic performance.
• Quality Assurance: Enabling consistent testing protocols during production to ensure compliance with international performance standards.
• Regulatory Compliance: Assisting authorities in setting certification criteria to guarantee that hearing aids meet internationally accepted acoustic and electrical requirements.
• Research & Innovation: Offering researchers a validated framework to investigate new hearing aid technologies and enhancements.
• Clinical Audiology: Supporting audiologists by ensuring that hearing aids deliver reliable and predictable amplification tailored to user needs.

Related Standards

• IEC 60118-1: Covers measurement of electroacoustic characteristics of hearing aids under different configurations and conditions.
• IEC 60118-2: Addresses test methods related to frequency response and equivalent input noise measurements.
• IEC 60118-6: Focuses on additional aspects such as induction coil performance and telecoil sensitivity.
• IEC 60318-4: Specifies details for ear simulators, which complement IEC 60118-0 measurements by mimicking the human ear’s acoustic properties.

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