ISO INTERNATIONAL STANDARD 2360 Fourth edition 2017-07 Non-conductive coatings on non- magnetic electrically conductive base metals Measurement of coating thickness Amplitude-sensitive eddy-current method Revetements non conducteurs sur matériaux de base non magnétiques conducteurs de I'électricité- - Mesurage de I'épaisseur de revetement - Méthode par courants de Foucault sensible aux variations d'amplitude Reference number IS0 2360:2017(E) International Organization for Standardization @ IS0 2017 ded by IHS unde ted without license from IHS IS0 2360:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland 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. ISOcopyrightoffice Ch. de Blandonnet 8 · CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Internationai ibrg DrganizationforStandardization icensee-ZHEJIANG INST OF STANDARDIZAISQ 017 - All rights reserved Not for Resale, 2017/9/27 05:51:43 networking permited withoutlicense from IHS IS0 2360:2017(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references ..1 3 Terms and definitions 4 Principle of measurement. ..2 5 Factors affecting measurement uncertainty 5.1 Basic influence of the coating thickness .3 5.2 Electrical properties of the base metal .3 5.3 Geometry: Base metal thickness. .4 5.4 Geometry: Edge effects.. .4 5.5 Geometry: Surface curvature. 4 5.6 Surfaceroughness ..4 5.7 Cleanliness: Lift-off effect .5 5.8 Probe pressure. .5 5.9 Probe tilt. .5 5.10 Temperature effects.. .5 5.11 Intermediate coatings .6 5.12 External electromagnetic fields ..6 6 Calibration and adjustment of the instrument .6 6.1 General. 6.2 Thickness reference standards ..6 6.3 Methods of adjustment. 7 Measurement procedure and evaluation 7.1 General .8 7.2 Number of measurements and evaluation ..8 8 Uncertainty of the results. 8.1 General remarks ..8 8.2 Uncertainty of the calibration of the instrument 8.3 Stochasticerrors .10 8.4 Uncertainties caused by factors summarized in Clause 5 10 8.5 Combined uncertainty, expanded uncertainty and final result ..11 9 Precision .11 9.1 General ..11 9.2 Repeatability (r) ..11 9.3 Reproducibility limit (R) ..12 10 Test report ..12 Annex A (informative) Eddy-current generation in a metallic conductor ..14 Annex B (informative) Basics of the determination of the uncertainty of a measurement of the used measurement method corresponding to ISo/IEC Guide 98-3 ..18 Annex C (informative) Basic performance requirements for coating thickness gauges which are based on the amplitude-sensitive eddy-current method described in this document..20 Annex D (informative) Examples for the experimental estimation of factors affecting the measurement accuracy. .22 Annex E (informative) Table of the student factor ..27 Annex F (informative) Example of uncertainty estimation (see Clause 8) ..28 Annex G (informative) Details on precision ..30 Bibliography .34 iii Censee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 ed without license from IHS Not for Resale, 2017/9/27 05:51:43