01383nam a22001097a 4500245014600000250000800146260006400154300001000218505100800228650002101236650001601257  aIEC 60645-5:2004-Electroacoustics - Audiometric equipment - Part 5 : bInstruments for the measurement of aural acoustic impedance/admittance  a1.0  aGeneva :bInternational Electrotechnical Commission,c2004.  a57 p.  aApplies to instruments designed primarily for the measurement of acoustic impedance/admittance in the human external acoustic meatus using a stated probe tone. It is recognized that other probe signals may also be used. The standard defines the characteristics to be specified by the manufacturer, lays down performance specifications for three types of instruments and specifies the facilities to be provided on these types. This standard describes methods of test to be used for approval testing and guidance on methods for undertaking routine calibration. The purpose of this standard is to ensure that measurements made under comparable test conditions with different instruments complying with the standard will be consistent. The standard is not intended to restrict development or incorporation of new features, nor to discourage innovative approaches. This first edition of IEC 60645-5 cancels and replaces the first edition of IEC 61027, published in 1991, and constitutes a technical revision.  aElectroacoustics  aAudiometric