ISO INTERNATIONAL STANDARD 4869-3 First edition 2007-07-01 Acoustics Hearing protectors - Part 3: Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture Acoustique - Protecteurs individuels contre le bruit - Partie 3: Mesurage de I'affaiblissement acoustique des protecteurs du type serre-tete au moyen d'un montage d'essai acoustique Reference number ISO 4869-3:2007(E) @ ISO 2007 y IHS under ted without license from IHS Not for Resale ISO 4869-3:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The IsO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below COPYRIGHTPROTECTEDDOCUMENT @ISO2007 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, IsO's member body in the country of the requester. ISO copyright office Case postale 56. CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2007 - All rights reserved I without license from IHS Not for Resale ISO 4869-3:2007(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeer non-governmental, in liaison with isO, also take part in the work. isO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEc Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 4869-3 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommitee SC 1, Noise. This first edition of ISO 4869-3 cancels and replaces ISO/TR 4869-3:1989, which has been technically revised. The technical changes are as follows: a)the title has been changed and the standard has been revised; the content of the former subclause on “test signal" has been included in the subclause “Measuring system"; c) the subclause “Measuring system" no longer contains specific requirements concerning the measuring system; d) Annex B, dealing with uncertainty, has been added. IsO 4869 consists of the following parts, under the general title Acoustics Hearing protectors: Part 1: Subjective method for the measurement of sound attenuation Part 2: Estimation of effective A-weighted sound pressure levels when hearing protectors are worn Part 3: Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture Part 4: Measurement of effective sound pressure levels for level-dependent sound-restoration ear-muffs [Technicai Report] Part 5: Method for estimation of noise reduction u