Abstract： IEC 60318-1:1998 pdf free download.Electroacoustics - Simulators of human head and ear -Part 1: Ear simulator for the calibration of supra-aural earphones. 4.5 Material The ear simulator shall be constructed of a hard, stable, non-magnetic...

IEC 60318-1:1998 pdf free download.Electroacoustics - Simulators of human head and ear -Part 1: Ear simulator for the calibration

of supra-aural earphones.

4.5 Material

The ear simulator shall be constructed of a hard, stable, non-magnetic material such as brass.

4.6 Measurement plane

The plane of the microphone diaphragm shall be understood to represent the entrance of the mean human ear canal.

4.7 Example of desIgn

A specific example of the ear simulator is shown in annex B.

5 Coupling of earphone to ear simulator

The earphone to be calibrated shall be applied to the ear simulator without acoustic leakage with a force 4,5 N ± 0,5 N, not

induding the weight of the earphone itself. If, for a specific earphone, a different coupling force is specified this shall be

stated.

The earphone shall not rest on the sloping side of the ear simulator, but only on the upper edge (or rim).

In the case of earphones with a hard earcap, a thin film of sealing material or thin soft rubber ring should be used on the lip in order to produce an effective seal between the earphone and the upper edge of the coupler.

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