ISO INTERNATIONAL STANDARD 18899 Second edition 2013-07-01 Rubber Guide to the calibration of test equipment Caoutchouc - Guide pour I'étalonnage du matériel d'essai Reference number IS0 18899:2013(E) LSO IS02013 IHS under itted without license from IHS Not for Resale IS0 18899:2013(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2013 All rights reserved. Unless otherwise specified, 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, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2013 - All rights reserved No reproductic networking permited without license from IHS Not for Resale IS0 18899:2013(E) Contents Page Foreword ..V 1 Scope 1 2 Normative references ..1 3 Terms and definitions 4 Principles of calibration 5 Calibration systems ..2 6 Traceability ..2 7 Calibration intervals 8 Records ..3 9 Guide to the expression of uncertainty ..3 10 Conditioning ..3 11 Procedures. ..3 12 Expression of results ..4 13 Calibration records ..4 14 Electrical measurements ..4 14.1 Current 4 14.2 Voltage. .5 14.3 Frequency and bandwidth .5 14.4 Resistance. .5 14.5 Wattage.. .5 14.6 Chart recorders. ..5 15 Dimensional measurements .6 15.1 Length-measuring instruments ..6 15.2 Linear dimensions .6 15.3 Profiles.. ..6 15.4 Extension, compression, and deflection. . 6 15.5 Finish, roughness, and flatness .6 15.6 Sieves, mesh, and pore size. .7 15.7 Area .7 15.8 Volume. .7 15.9 Angle. .7 15.10 Levelling 15.11 Centre of percussion .7 16 Fluids: flow, pressure, viscosity, and density measurements .7 16.1 Flowmeters 16.2 Devices producing a specified flow rate. 7 16.3 Air exchange rate 16.4 Pressuretransducers ..8 16.5 Manometers ..8 16.6 Devices producing a specified pressure ..8 16.7 Density .8 17 Optical measurements ..8 17.1 .8 Irradiance 17.2 Refractometers. ..8 17.3 Colour-measuring instruments 18 Temperature measurements .9 iii ed without license from IHS Not for Resale