ISO INTERNATIONAL STANDARD 13475-1 First edition 1999-11-15 Acoustics Stationary audible warning devices used outdoors - Part 1: Field measurements for determination of sound emission quantities Acoustique - Dispositifs d'alarme sonore fixes utilisés a I'extérieur Partie 1: Mesurages sur le terrain des grandeurs d'émission acoustique ISO Referencenumber ISO 13475-1:1999(E) ISO 13475-1:1999(E) Contents 2 Normative references. opy Termsanddefinitions 84 Testcondition 4.1 Test site. icor 4.2 Mounting of apparatus 64.3 Instrumentatior Microphone positions ... 64.5 Measurementmethods Ambient conditions 8:42 estprocedure. Acousticcharacteristics Testsignals 26 5.2 Durationofthemeasurement. Noy Determination of the sound emission quantities . Su Measurementuncertainty. 6 Information to be reported. .10 nex A (normative) Supply conditions 14 Annex B (normative) Calculation of combined expanded uncertainty.. .15 S Bibliography 19 Licensed Copy: sheffieldu ii ISO 13475-1:1999(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 technical committees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhas liaison with sO, 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/IEC Directives, Part 3. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote International Standard ISO 13475-1 was prepared by ISO/TC 43, Acoustics, Subcommittee SC 1, Noise. IsO 13475 consists of the following parts, under the general title Acoustics - Stationary audible warning devices usedoutdoors Part 1:Field measurements for determination of sound emission quantities —Part 2:Testroommeasurements — Part 3: Outdoor propagation of warning signals over built-up areas Annexes A and B form a normative part of this part of ISO 13475 i