+91 80984 42953 hello@sascert.in
Verify a certificate ISO standards library Download brochure
ISO 389-8:2004Published

Acoustics — Reference zero for the calibration of audiometric equipment — Part 8: Reference equivalent threshold sound pressure levels for pure tones and circumaural earphones

Acoustique — Zéro de référence pour l'étalonnage d'équipements audiométriques — Partie 8: Niveaux de référence équivalents de pression acoustique liminaire pour les écouteurs à sons purs circumauraux

Abstract / scope

ISO 389-8:2004 specifies reference equivalent threshold sound pressure levels (RETSPLs) for pure tones in the frequency range from 125 Hz to 8 kHz, applicable to the calibration of air conduction audiometers equipped with a particular model of circumaural earphones (SENNHEISER HDA 200).

Some notes and references on the derivation and the test conditions used to determine the recommended reference levels are given in Annex A and the Bibliography.

The sound attenuation of the earphone is given in Annex B. For speech audiometers of types A-E and B-E, the correction figures of the earphone for a free-field equivalent output are given in Annex C.