ISO INTERNATIONAL STANDARD 8253-1 Secondedition 2010-11-01 Acoustics Audiometric test methods Part 1: Pure-tone air and bone conduction audiometry Acoustique-Méthodes d'essais audiométriques Partie 1: Audiometrie a sons purs en conduction aérienne et en conductionosseuse Reference number ISO 8253-1:2010(E) @ ISO 2010 ISO8253-1:2010(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 ? ISO2010 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.+4122 7490111 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland ISO 2010 - All rights reserved ISO 8253-1:2010(E) Contents Page Foreword. Introduction... ...vi 1 Scope. 2 Normative references.... 3 Terms and definitions . 4 General aspects of audiometric measurements . 4.1 General .... 4.2 Standard reference zero for the calibration of audiometric equipment . 4.3 Requirements on audiometric equipment .... 4.4 Qualified tester ... 4.5 4.6 Conditions for audiometric test environments. 4.7 Measurement uncertainty...... 5 Preparation and instruction of test subjects before audiometric testing and positioning of transducers... 5.1 Preparation of test subjects .. 5.2 Instruction of test subjects.... 5.3 Placementoftransducers.. 6 Air conduction hearing threshold level determinations using fixed-frequency audiometry ... 6.1 General ..... 6.2 6.3 Hearing threshold determination with an automatic recording audiometer. 10 6.4 Computer-controlled threshold determination.... .12 7 Air conduction hearing threshold level determinations using sweep-frequency audiometry... 12 7.1 General. 12 7.2 Presentation of testtone.... 7.3 Familiarization.. 12 7.4 Hearing threshold level measurement . 7.5 Calculation of hearing threshold level at a specified frequency ......... 12 8 Bone conduction hearing threshold audiometry . 13 8.1 Method of audiometry.... 13 8.2 Occlusion... 8.3 Airborne sound radiation from the bone vibrator.... 13 8.4 13 8.5 Procedures for testing with masking in bone conduction audiometry 9 Screening audiometry... 14 9.1 General .... 9.2 Procedure for the screening test..... .14 10 Audiograms.. 15 11 Permissible ambient noise .. 11.1 Permissible ambient noise for threshold determinations.. .16 11.2 Psychoacoustic check on ambient noise.... 12 Maintenance and calibration of audiometric equipment. 20 12.1 General.... .20 12.2 Intervals between checks..... 20 ^ *"ghts reserved ili