This part of ISO 389 specifies a standard reference zero for the scale of hearing threshold level applicable to puretone air conduction audiometers, in order to promote agreement and uniformity in the expression of hearing threshold level measurements throughout the world.
It states the information in a form suitable for direct application to the calibration of audiometers, that is, in terms of the response of two different standard models of earphone measured on a coupler complying with IEC 60303 and in terms of other supra-aural earphones of models specified in 4.3 measured on an artificial ear complying with IEC 60318.
It is based on an assessment of the information available from the various standardizing laboratories responsible for audiometric standards and from scientific publications.
Some notes on the derivation and application of the recommended reference levels are given in annex A.
Diese ÖNORM legt Standard-Bezugspegel für die Hörschwellenpegel-Skale von Reinton-Luftleitungs-Audiometern fest, um die weltweite Übereinstimmung und Einheitlichkeit in der Angabe der Ergebnisse von Hörschwellenpegel-Messungen zu fördern. Diese ÖNORM gibt die Daten in einer solchen Weise an, dass sie bei der Kalibrierung von Audiometern unmittelbar angewendet werden können.