ISO INTERNATIONAL STANDARD 4412-3 First edition 1991-08-15 Hydraulicfluidpower--Test codefor determination of airbornenoise levels Part 3: Pumps --- Method using a parallelepiped microphone array Transmissions hydrauliques --Coded'essai pour la determination du niveau de bruit aerien parallelepipede Referencenumber ISO 4412-3:1991(E) ISO4412-3:1991(E) Contents Page 1 Scope 2 Normative references Definitions 3 4 Measurementuncertainty 2 5 Testenvironment 2 6 Instrumentation 2 Installation conditions 3 8 Operatingconditions 3 Locationandnumberof soundmeasurementpoints 3 10 Test procedure 4 11 Calculationof surfacesoundpressurelevelsandsoundpower levels 5 12 Informationtoberecorded 5 13 Test report 6 14 identificationstatement (Referencetothispartof Iso4412) Annexes A Errorsandclassesofmeasurement Bibliography B @iso1991 All rights reserved. No part of this publication may be reproduced or utilized in any form orby any means,electronic or mechanical, including photocopying and microfilm,without permission in writing from the publisher. International Organization for Standardization CasePostale56·CH-1211Genéve20·Switzerland Printed in Switzerland i ISO 4412-3:1991(E) Foreword Iso(the International Organization for Standardization)is a worldwide federation of national standards bodies (IsO memberbodies).The work of preparing International Standards isnormally carried out throughiso technical committees. Each member body interested in a subject for which a technical committee has been established has the rightto be represented on that committee.International organizations,govern- mental and non-governmental,in liaison withIso,alsotake part inthe work.Isocollaborates closely with theInternational Electrotechnical Commission (IEC)onall matters ofelectrotechnicalstandardization. Draft International Standards adopted by thetechnical committees are circulated to the member bodies for voting. Publication as an Inter- bodies castingavote. CommitteesIsoO/TC131,Fluidpowersystems,Sub-CornmitteeSC8, ProducttestingandcontaminationcontrolandIsO/TC43,Acoustics. IsO4412consistsofthefollowingparts,underthegeneraltitleHydraulic fluidpower-Test codefordetermination ofairbornenoise levels -Part1:Pumps -Part2:Motors Part3:Pumps-Methodusingaparallelepipedmicrophonearray AnnexAformsan integral part of this part of ISO4412.AnnexB is for information only. ili