# ISO 10534-2:1998 — Withdrawn and superseded ISO standards For ISO 10534-2:1998, item title is Acoustics — Determination of sound absorption coefficient and impedance in impedance tubes — Part 2: Transfer-function method; status code is 9599; successor is ISO 10534-2:2023; withdrawn / published date is 1998-11-19, recorded from its source on 2026-08-05. - **Identifier:** ISO 10534-2:1998 _(verified: appears in the quote below)_ - **Item title:** Acoustics — Determination of sound absorption coefficient and impedance in impedance tubes — Part 2: Transfer-function method _(verified: appears in the quote below)_ - **Status code:** 9599 _(verified: appears in the quote below)_ - **Successor:** ISO 10534-2:2023 - **Withdrawn / published date:** 1998-11-19 _(verified: appears in the quote below)_ ## What the source says > 22851,IS,,ISO 10534-2:1998,Acoustics — Determination of sound absorption coefficient and impedance in impedance tubes — Part 2: Transfer-function method,Acoustique — Détermination du facteur d'absorption acoustique et de l'impédance des tubes d'impédance — Partie 2: Méthode de la fonction de transfert,1998-11-19,1,['17.140.01'],ISO/TC 43/SC 2,9599,,[81294],"['en','fr']",27,"
This test method covers the use of an impedance tube, two microphone locations and a digital frequency analysis system for the determination of the sound absorption coefficient of sound absorbers for normal sound incidence. It can also be applied for the determination of the acoustical surface impedance or surface admi ## Source - https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv Last verified: 2026-08-05. Review by: 2027-02-01. Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).