BS EN 60318-5:2006 PDF

Scope: This part of IEC 60318 describes an acoustic coupler for loading an earphone or hearing aid with a specified acoustic impedance when determining its physical performance characteristics, in the frequency range 125 Hz to 8 kHz. It is suitable for air conduction hearing aids and earphones, coupled to the ear by means of ear inserts e.g. ear moulds or similar devices. The sound pressure developed by an earphone is not, in general, the same in the coupler as in a person’s ear. However, it can be used as a simple and ready means for the exchange of specifications and of physical data on hearing aids and for the calibration of specified insert earphones used in audiometry.

BS EN 60318-5:2006 Referenced Document

IEC 61094-4 Measurement microphones - Part 4: Specifications for working standard microphones
ISO 389-2 Acoustics - Reference zero for the calibration of audiometric equipment - Part 2: Reference equivalent threshold sound pressure levels for pure tones and insert earphones

2006 BS EN 60318-5:2006 Electroacoustics - Simulators of human head and ear - 2 cm3 coupler for the measurement of hearing aids and earphones coupled to the ear by means of ear inserts
1981 BS 6111:1981 Specification for reference coupler for the measurement of hearing aids using earphones coupled to the ear by means of ear inserts