ISO INTERNATIONAL STANDARD 10534-2 Second edition 2023-10 Acoustics Determination of acoustic properties in impedance tubes - Part 2: Two-microphone technique for normal sound absorption coefficient and normal surface impedance Acoustique Determination des propriétés acoustiques aux tubes d'impédance- Partie 2: Méthode a deux microphones pour le coefficient d'absorption sonore normal et I'impeédance de surface normale Reference number IS0 10534-2:2023(E) ISO @IS02023 IS0 10534-2:2023(E) COPYRIGHT PROTECTED DOCUMENT @IS02023 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, withoutpriorwrittenpermission.Permission can berequestedfrom eitherIso at theaddress below orIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @IS0 2023 - All rights reserved