STD.I50 487-ENGL 1996 4851903 0693430 084 INTERNATIONAL ISO STANDARD 4871 Second edition 1996-12-15 Acoustics - Declaration and verification of noise emission values of machinery and equipment Acoustique - Déclaration et verification des valeurs d'emission sonore des machines et équipements This material is reproduced from Iso documents under International Organization for Standardization (Iso) Copyright License number IHS/ICC/1996. Not for resale. No part of these Iso documents may be reproduced in any form, electronic retrieval system or otherwise, except as allowed in the copyright law of the country of use, or with the prior written consent of Iso (Case postale 56, 1211 Geneva 20, Switzerland, Fax +41227341079),1HSortheISOLicensor'smembers. X ISO Reference number ISO 4871:1996(E) Copyright International Organization for Standardization Not for Resale E0bTsh STD.ISO 4871-ENGL1996 TEhEb90 T1O ISO 4871:1996(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 which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and 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. circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 4871 was prepared by Technical Committee ISo/TC 43, Acoustics, Subcommittee SC 1, Noise. Thissecond editioncancelsand replaces the first edition (IS0 4871:1984), which has been technically revised. Annexes A, B, C and D of this International Standard are for information only. ISO 1996 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 the publisher. International Organization for Standardization Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland e from IHS Not for Resale STD.IS0 4B71-ENGL 1996 48519030693432957 C ISO ISO 4871:1996(E) Introduction Information on the acoustic noise emitted by machinery and equipment is needed by users, planners, manufacturers and authorities. This infor- for assessing noise emissions against noise timits, for planning workplace In order for machinery noise emission data to be useful, uniform methods of measurement and declaration are necessary to achieve the following purposes. Measurement of noise emission The ISO 3740 series specifies methods for determining the sound power levels of noise sources from sound pressure level measure- ments; the isO 9614 series specifies methods for determining the sound power levels from sound intensity level measurements; the IsO 11200 series describes methods for determining emission sound pressure levels at specified positions in the vicinity of machinery and equipment. Many other standards give test codes for the measure- arebasedonthesemethods fg Determinationof the noiseemissionvaluetobedeclared The isO 7574 series gives methods for determining declared noise emission values which are based primarily on the sound power levels of noise sources. For a complete presentation of declared noise specified positions as well as the sound power level. Because of the possible confusion in terminology with respect to sound pressure lev- els used to define noise immission, the term "emission sound press- ure level"is used inthis InternationalStandard. C Presentationofdeclared noiseemissionvalues It is of prime importance to declare sound power levels. It is recog- nized, however, that information on emission sound pre