7574/3 nternational Standard (ISO Acoustics Statistical methods for determining and verifying stated noise emission values of machinery and equipment - Part 3 : Simple (transition) method for stated values for batches of machines Acoustique - Méthodes statistiques pour la détermination et le controle des valeurs declarees d'émission acoustique des machines et équipements - Partie 3: Methode simplifiee (transitoire) pour valeurs déclarees de lots de machines First edition - 1985-12-15 ISO 7574/3-1985 (E) UDC 534.835.46 : 512.24 Ref. No. 1SO 7574/3-1985 (E) Descriptors : acoustics, machinery, noise (sound), statistical quality control, statistical analysis. Price based on 2 pages 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. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISo Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 7574/3 was prepared by Technical Committee ISO/TC 43, Acoustics. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. International Organization for Standardization, 1985 ? Printed in Switzerland INTERNATIONAL STANDARD ISO 7574/3-1985 (E) Acoustics - Statistical methods for determining and verifying stated noise emission values of machinery and eguipment Part 3 : Simple (transition) method for stated values for batches of machines O Introduction ISo 3743, Acoustics -- Determination of sound power levels of noise sources - Engineering methods for special reverberation A general introduction to the four-part series of ISO 7574 is test rooms. given in ISO 7574/1. Iso 3744, Acoustics - Determination of sound power levels of For the purposes of this part of IS0 7574, the term "labelled - Engineering methods for free-field conditions noise sources value" stands for all kinds of stated values (e.g. information on overa reflectingplane. a label, the upper noise limit set by an authority, the agreed Iso 3745, Acoustics - Determination of sound power levels of contract value) for which the methods may be applied. noise sources - Precision methods for anechoic and semi- anechoic rooms. Scope and field of application ISo 3746, Acoustics - Determination of sound power levels of noise sources - Survey method. This part of ISO 7574 is derived from ISO 7574/4. It provides guidelines for determining the labelled value, Lc, by the labeller ISO7574/1,Acoustics-Statisticalmethodsfordetermining and specifies a simple method for verifying compliance of the and verifying stated noise emission values of machinery and noise emissions of a batch (lot) of machinery or equipment with equipment - Part 1: General considerations and definitions. its labelled value, Lc. This method may be used when a specific noise labelling code(in accordancewithclause6of ISo 7574/4, Acoustics -- Statistical methods for determining ISo 7574/4) specifying the reference standard deviation, and verifying stated noise emission values of machinery and sample size and sampling procedure for the family of machines equipment -- Part 4: Methods for stated values for batches of does not yet exist. If a specific noise labelling code exists, it machines. shall be used, in which case reference to this part of iSO 7574 shall not be made. 3