ISO INTERNATIONAL STANDARD 4412-3 First edition 1991-08-15 Hydraulic fluid power --. Test code for determination of airborne noise levels Part 3: Pumps -- Method using a parallelepiped microphone array Transmissions hydrauliques -- Code d'essai pour la determination du niveau de bruit aerien Partie 3: Pompes -- Methode employant un etalage des microphones en parallelepipede Reference number ISO 4412-3:1991(E) Copyright International Organization for Standardization cing permitted without license from IHS Not for Resale ISO 4412-3:1991(E) Contents Page Scope 1 2 Normative references 3 Definitions 4 Measurement uncertainty 2 5 Test environment 2 6 Instrumentation 2 7 Installation conditions 3 Operating conditions 8 3 9 Location and number of sound measurement points 3 10 Test procedure 4 11 Calculation of surface sound pressure levels and sound power levels 5 12 Information to be recorded 5 13 Test report 6 Identification statement (Reference to this part of isO 4412) 14 7 Annexes Errors and classes of measurement A 8 Bibliography B 9 C IS01991 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, inciuding photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56CH-1211 Genéve 20·Switzerland Printed in Switzerland Standardization Not for Resale ISO 4412-3:1991(E) Foreword IsO(the InternationaiOrganization 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 International organizations, represented on that committee. govern- mental and non-governmental, in liaison with isO, also take part in the collaborates closely with the International Electrotechnical work. isO Commission (IEC) on all matters of eiectrotechnical standardization. Draft international Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at ieast 75 % of the member bodies casting a vote. Committees ISO/TC 131, Fluid power systems, Sub-Cornmittee SC 8. Product testing and contamination control and isO/TC 43, Acoustics. IsO 4412 consists of the foilowing parts, under the general title Hydraulic fluid power --- Test code for determination of airborne noise levels: Part 1: Pumps -- Part 2: Motors Part 3: Pumps -- Method using a parallelepiped microphone array Annex A forms an integrai part of this part of isO 4412. Annex B is for information only iii CopyrightIntenational Organizationfor Standardization Not for Resale