ISO/TS TECHNICAL SPECIFICATION 13475-2 First edition 2000-10-15 Acoustics Stationary audible warning devices used outdoors - Part 2: Precision methods for determination of sound emission quantities Acoustique - Dispositifs d'alarme sonore fixes utilisés a I'extérieur- Partie 2: Methodes de laboratoire pour le mesurage des grandeurs d'émission acoustique Reference number E ISO/TS 13475-2:2000(E) ISO @ ISO 2000 HS under I without license from IHS Not for Resale ISO/TS 13475-2:2000(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 trademarkof 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 ?ISO2000 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or 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.ch Printed in Switzerland @ ISO 2000 - All rights reserved ermittedwithoutlicense from IHS Not for Resale ISO/TS 13475-2:2000(E) Contents Page Foreword .iv Introduction Scope 2 Normative references .. 3 Terms and definitions 4 Symbols..... 5 Measurement methods.. 5.1 General...... 5.2 Microphone positions 5.3 Free-field method... 5.4 Measurements in a free field over a reflecting plane 6 Test conditions. 6.1 Test site qualifications. 6.2 Mounting of apparatus.. 6.3 Instrumentation... 6.4 Test procedure 7 Acoustic characteristics .. 7.1 General.... 7.2 7.3 Determination of the sound emission quantities .. 10 7.4 Directional characteristics.. 13 7.5 Frequency characteristics . 13 7.6 Noise from sirens.... 14 7.7 Measurement uncertainty 14 7.8 Test signals .... 14 8 Information to be reported.. 14 Annex A (normative) Supply conditions.. 17 18 Annex C (normative) Test site qualification procedures .. 20 Bibliography. 22 ii THS unde nse from IHS Not for Resale