00768nam a22000977a 4500245013000000250000800130260006400138300001000202505044100212650001700653  aIEC 60118-9:1985-Hearing aids. Part 9 : bMethods of measurement of characteristics of hearing aids with bone vibrator output  a1.0  aGeneva :bInternational Electrotechnical Commission,c1985.  a23 p.  aDefines a method of expressing the input/output ratio as an acousto-mechanical sensitivity level measured on a mechanical coupler according to the second edition of IEC 60373. Provides a suitable basis for the exchange of information or for direct comparison of the electroacoustic characteristics of hearing aids using bone vibrator outputs. The methods chosen are practical and reproducible and are based on selected fixed parameters.  aHearing aids