ISO INTERNATIONAL STANDARD 4412-2 Second edition 1991-08-15 Hydraulic fluid power --- Test code for determination of airborne noise levels : Part 2: Motors Transmissions hydrauliques -- Code d'essai pour la determination du niveau de bruit aerien Partie 2:Moteurs Reference number ISO 4412-2:1991(E) ISO 4412-2:1991(E) Contents Page Scope 2 Normative references 1 3 Definitions 2 4 Measurement uncertainty 2 5 Test environment 2 6 Instrumentation 3 Installation conditions 3 8 Operating conditions 3 9 Locationandnumberof sound measurementpoints 4 10 Test procedure 4 11 Information to be recorded 4 12 Test report 6 13 Identification statement (Reference to this part of IsO 4412) 6 Annexes A Calculation of sound levels B Errors and classes of measurement 8 C Guidelines for the application of this part of iso 4412 9 D Bibliography 20 C1SO1991 orby any means,electronic ormechanical,including photocopying and microfilm,without permission in writing from the publisher. InternationalOrganizationforStandardization Case Postale 56 : CH-1211 Geneve 20 : Switzerland Printed in Switzerland ii ISO 4412-2:1991(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 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. Iso collaborates closely with the International Electrotechnical Commission(lEC)onallmattersofelectrotechnicalstandardization. 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 least 75 % of the member bodies casting a vote. Committees ISO/TC 131, Fluid power systems, Sub-Committee sC 8, Product testing and contamination control and IsO/TC 43, Acoustics. This second edition cancels and replaces the first edition (ISo a new annex A. The former annex A has become annex B, and annexes C and D have been added. Iso 4412 consists of the following parts, under the general title Hydraulic fluid power -- Test code for determination of airborne noise levels: - Part 1: Pumps -Part2:Motors Part 3: Pumps - Method using a parallelepiped microphone array Annexes A and B form an integral part of this part of IsO 4412. Annexes C and D are for information only. li