ISO/TS TECHNICAL SPECIFICATION 4869-5 First edition 2006-10-15 Acoustics Hearing protectors Part 5: Method for estimation of noise reduction using fitting by inexperienced test subjects Acoustique Protecteurs individuels contre le bruit - Partie 5: Methode d'estimation de la reduction du bruit au moyen de reglagespardessujetsd'essainonexpérimentes Reference number ISO/TS 4869-5:2006(E) @ ISO 2006 ISO/TS 4869-5:2006(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 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. ?ISO2006 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, ISsO'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 ii @ ISO 2006 -All rights reserved ISO/TS 4869-5:2006(E) Contents Page Foreword. Introduction 1 Scope 2 Normative references .. 3 Terms and definitions.. 4 Measurement of the noise reduction of hearing protectors 4.1 Test signals ..... 4.2 4.2.1 Conditions to be met for the test to be valid 4.2.2 Reverberation time .... 4.2.3 Background noise... 4.3 Test equipment ......... 5 Test subjects .. 5.1 Conditions for subject acceptance/dismissal ... 5.1.1 General.... 5.1.2 Age and sex.. 5.1.3 5.1.4 Anatomicalfeatures... 5.1.5 Maximum hearing threshold levels... 5.1.6 Minimum hearing threshold levels..... 5.1.7 5.1.8 Threshold variability.. 5.2 Number of subjects . 5.3 Otoscopic inspection ... 5.4 Spectacles and jewellery 5.5 Maximum number of tests per subject. 5.6 Exceptions... 6 Product samples 6.1 8 6.2 Custom-moulded ear-plugs ... 6.3 Special requirements for product instruction 6.4 Variable position headbands.... 9 6.5 Variable band force........ 9 7 Test procedure..... 9 7.1 Number of open-ear and occluded-ear threshold measurements 7.2 Information to subjects .... 9 7.3 Prior to entering the test room ... 10 7.4 Inside the test room... 10 7.4.1 Positioning the subject , 10 7.4.2 Quiet period prior to first threshold determination .. 11 7.4.3 Fitting the hearing protector for test .... 11 7.4.4 Re-determination of thresholds ... 11 8 Computationofnoisereductionvalues 12 8.1 General.. 12 8.2 Calculation of the individual noise reductions. 12 8.3 Calculation of group noise reduction .... 12 8.4 Uncertainty of the noise reduction data. 13 Is 2006-All rights reserved ili ISO/TS 4869-5:2006(E) 9 Reporting of data .... Annex A (informative) Uncertainty of hearing protector noise reduction measurements. Bibliography .... iv @ ISO 2006 - All rights reserved ISO/TS 4869-5:2006(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO 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 adoptedbythe technical committeesarecirculatedtothemem