ISO INTERNATIONAL STANDARD 21940-21 Second edition 2022-11 Mechanical vibration Rotor balancing - Part 21: Description and evaluation of balancing machines Vibrations mécaniques - Equilibrage des rotors - Partie 21: Description et évaluation des machines a équilibrer Reference number ISO 21940-21:2022(E) ISO @IS02022 IS0 21940-21:2022(E) COPYRIGHT PROTECTED DOCUMENT @ISO2022 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, withoutpriorwrittenpermission.Permission can berequestedfrom eitherIso at theaddress below orIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2022 - All rights reserved