ISO INTERNATIONAL STANDARD 4412-1 Secondedition 1991-08-15 Hydraulic fluid power -- Test code for determination of airborne noise levels Part 1: Pumps Transmissions hydrauliques -Code d'essai pour la determination du niveau de bruit aerien Partie1:Pompes Referencenumber ISO 4412-1:1991(E) ISO 4412-1:1991(E) Contents Page 1 Scope 1 2 Normativereferences 1 3 Definitions 1 4 Measurement uncertainty 2 5 Test environment 2 6 Instrumentation 2 7 Installationconditions 2 8 Operating conditions 3 9 Locationandnumberof soundmeasurementpoints 4 10 Testprocedure 4 11 Information to berecorded 4 12 Test report 6 13 Identificationstatement (Referencetothispartof Iso4412) 6 Annexes A Calculationofsoundlevels 7 B Errorsandclassesofmeasurement 8 c Guidelines for the application of this part of Iso 4412 9 D Bibliography 20 ISO1991 or by any means,electronic or mechanical, including photocopying and microfim, without permission in writing from the publisher. International Organizationfor Standardization Case Postale56.CH-1211 Geneve20·Switzerland Printed in Switzerland i ISO4412-1:1991(E) Foreword Iso (the International Organization for Standardization)is a worldwide federation of national standards bodies (iso member bodies).Thework 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.Isocollaborates. closely with the International Electrotechnicat Commission (IEC)on allmatters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approvai by at least75% of the member bodies castingavote. International Standard iso 4412-1 was prepared jointly by Technical CommitteesISO/TC131,Fluidpower systems,Sub-CommitteeSC8, ProducttestingandcontaminationcontrolandIsO/TC43,Acoustics. This second edition cancels and replaces the first edition (ISO 4412-1:1979),ofwhichclauses12and13havebeentransferredtoform a new annex A. The former annex A has become annex B, and annexes C and D have been added. iso 4412 consistsofthefollowingparts,underthegeneral titleHydraulic fluid power-Test codefordeterminationof airborne noise levels: Part1:Pumps 一 -Part 2:Motors AnnexesAand B form an integral partof thispartofisO4412.Annexes C and D are for information only. ili