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ASA S3.55-2014/Part 5 /IEC 60318-5:2006 (MOD)
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ASA S3.55-2014/Part 5 /IEC 60318-5:2006 (MOD) American National Standard Electroacoustics - Simulators of Human Head and Ear - Part 5: 2 cm*2 Coupler for the Measurement of Hearing Aids and Earphones Coupled to the Ear by Means of Ear Inserts (a modified nationally adopted international standard)
standard by American National Standards of the Acoustical Society of America, 07/21/2014
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This part of ANSI/ASA S3.55 / IEC 60318 describes an acoustic coupler for loading an earphone orhearing aid with a specified acoustic impedance when determining its physical performancecharacteristics, in the frequency range 125 Hz to 8 kHz. It is suitable for air conduction hearing aidsand earphones, coupled to the ear by means of ear inserts e.g. ear molds or similar devices.The sound pressure developed by an earphone is not, in general, the same in the coupler as in aperson's ear. However, it can be used as a simple and ready means for the exchange of specificationsand of physical data on hearing aids and for the calibration of specified insert earphones used inaudiometry.