DIN/VDI Standards Committee Acoustics, Noise Control and Vibration Engineering
Electroacoustics - Hearing aids - Part 0: Measurement of the performance characteristics of hearing aids
This part of IEC 60118 gives recommendations for the measurement of the performance characteristics of air conduction hearing aids measured with an acoustic coupler or ear simulator. This part of IEC 60118 is applicable to the measurement and evaluation of the electroacoustical characteristics of hearing aids, for example for type testing and manufacturer data sheets. This part of IEC 60118 is also applicable for the measurement of the performance characteristics of hearing aids for production, supply and delivery quality-assurance purpose. For these measurements the frequency range has been limited to 5 kHz. The manufacturer will normally assign nominal values. The test results obtained by the methods specified in this part of IEC 60118 will express the performance under conditions of the test and may deviate substantially from the performance of the hearing aid under actual conditions of use. This part of IEC 60118 primarily uses an acoustic coupler according to IEC 60318-5 which is only intended for loading a hearing aid with specified acoustic impedance and is not intended to model the sound pressure in a person´s ear. For measurements that will reflect the output level in a normal human ear the occluded ear simulator according to IEC 60318-4 may be used for a limited set of measurements. For extended high frequency measurements and for hearing aids deeply inserted in the ear a coupler with a volume of 0,4 cm³ according to IEC 60318-8 may be used for a limited set of measurements. This part of IEC 60118 also covers measurement of hearing aids with non-acoustic inputs, such as wireless, inductive or electrical input. For the measurement of the performance characteristics of hearing aids for simulated in situ working conditions, IEC 60118-8 can be used. For measurement of hearing aids under typical user settings and using a speech-like signal, IEC 60118-15 can be used. Measurements which are aligned with IEC 60118-8 or IEC 60118-15 and therefore simulate realistic use conditions, are indicated in the corresponding sub-clauses. Conformance to the specifications in this International Standard for production, supply and delivery quality-assurance purposes is demonstrated only when the result of a measurement, extended by the actual expanded uncertainty of measurement of the testing laboratory, lies fully within the tolerances specified in this document extended by the values for Umax given in Table 5. Though the number of measurements covered by this part of IEC 60118 is limited, it is not intended that all measurements described herein are mandatory. In cases of custom-made in-the-ear hearing aids, the data supplied by the manufacturer applies only to the particular hearing aid being tested.
Planned document number
DIN EN IEC 60118-0