BS EN ISO BRITISH STANDARD 8253-2:2009 Acoustics - Audiometric test methods Part 2: Sound field audiometry with pure-tone and narrow-band test signals (ISO 8253-2:2009) ICS 13.140; 17.140.50 BSi British Standards BSENISO8253-2:2009 National foreword This British Standard is the UK implementation of ENISO 8253-2:2009. It supersedesBSENISO8253-2:1998which iswithdrawn. The UK participation in its preparation was entrusted to Technical Committee EH/1, Acoustics. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard Amendments/corrigenda issued since publication was published under the authority of the Standards Policy and Strategy Date Comments Committee on 28 February 2010. BSI 2010 ISBN 978 0580 648557 EN ISO 8253-2 EUROPEANSTANDARD NORMEEUROPEENNE EUROPAISCHE NORM December2009 ICS 13.140 Supersedes EN ISO 8253-2:1998 English Version Acoustics-Audiometrictestmethods-Part2:Soundfield audiometry with pure-tone and narrow-band test signals (iso 8253-2:2009) Acoustique - Methodes d'essais audiometriques - Partie 2: Akustik - Audiometrische Prufverfahren - Teil 2: Schallfeld- Audiometrie en champ acoustique avec des sons purs et Audiometrie mit reinen Tonen und schmalbandigen des bruits a bande etroite comme signaux d'essai (isO Prufsignalen (ISO 8253-2:2009) 8253-2:2009) This European Standard was approved by CEN on 26 October 2009. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation official versions. Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. cen EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPAISCHES KOMITEEFUR NORMUNG Management Centre:Avenue Marnix 17,B-1000Brussels @2009CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8253-2:2009: E worldwide for CEN national Members. BSENISO8253-2:2009 EN ISO 8253-2:2009 (E) Foreword collaboration with the Technical Committee CEN/TC 211 "Acoustics" the secretariat of which is held by DS This European Standard shall be given the status of a national standard, either by publication of an identical the latest by June 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 8253-2:1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Sweden, Switzerland and the United Kingdom. Endorsementnotice BSENISO8253-2:2009 ISO8253-2:2009(E) Contents Page Foreword. .iv Introduction 1 Scope. 2 Normativereferences 3 Terms and definitions 4 Testsignal characteristics 4.1 General 4.2 Puretones. 4.3 FMtones 4.4 Narrowbands of noise. 4.5 Harmonic distortion . 4.6 Signal gating ..... 4.7 Signal level control... 4.8 Means and scales for calibration. 5 Soundfield characteristics. 5.1 General, 5.2 Free sound field. 5.3 Diffuse sound field .. 5.4 Quasi-free sound field.. 6 Ambient noise levels in the test room.. 7 Preparation and instruction of test subject... 8 Determination of hearing threshold level .. .8 8.1 General. 8.2 Monaural testing.... 8.3 Binaur