ISO INTERNATIONAL STANDARD 10534-1 First edition 1996-12-15 Acoustics Determination of sound absorption coefficient and impedance in impedance tubes - Part 1: Method using standing wave ratio Acoustique -Détermination du facteurd'absorption acoustique et de I'impedance acoustique a I'aide du tube d'impedance Partie 1:Méthode du taux d'ondes stationnaires This material is reproduced fromIsO documents underInternational Organization for Standardization (Iso) Copyright License number IHS/icC/1996. Not for resale. No part of these Iso documents may be reproducedinanyform,electronic retrievalsystemorotherwise,except written consent of Iso (Case postale 56, 1211 Geneva 20, Switzerland, Fax +41 22 734 10 79), IHs or the so Licensor's members. Reference number ISO 10534-1:1996(E) Copyright International Organization for Standardization Not for Resale ISO 10534-1:1996(E) Contents Page 1 Scope. 1 2 Normative references. 1 3 Definitions 2 4 Principle. 3 5 Fundamentals 3 6 Test equipment 5 7 Preliminary tests and measurements. 10 8 Mounting of the test sample....... 10 9 Test methods ... 10 10 Transformation of reflection factor and impedance 11 11 Test report 12 Annexes A Preliminary measurements .. 14 B Verification of the test equipment.. 17 c Pressure-release termination of test sample . 19 D Determination of diffuse sound absorption coefficient αst of locally reacting absorbers ..... 20 @ISO1996 reproduced or utilized in any form or by any means, electronic or mechanical, including international Organization for Standardization CasePostale56·CH-1211Geneve20-Switzerland Printed in Switzerland ii Copyright International Organization for Standardizatior No reproduction or networking permitted without license from IHS Not for Resa @ ISO ISO10534-1:1996(E) Foreword preparing International Standards is normally carried out through isO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (lEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International avote. International Standard ISO 10534-1 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 2, Building acoustics. IsO 10534 consists of the following parts, under the general title Acous- tics - Determination of sound absorption coefficient and impedance in impedancetubes: Part 1:Method using standing wave ratio Part2:Method usingtwomicrophones Annexes A, B and C form an integrai part of this part of ISO 10534. Annex D is for information only. ili n for Standardization Not for Resale