ISO/TR TECHNICAL REPORT 16476 First edition 2016-06-01 Reference materials - Establishing and expressing metrological traceability of quantity values assigned to reference materials Matériaux de réference -Etablissement et expression de la tracabilité métrologique de valeurs assignées a des matériaux de reference Reference number IS0/TR 16476:2016(E) ISO @IS02016 r networking permitted without license from IHS IS0/TR 16476:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form 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 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 @ IS0 2016 - All rights reserved or networking permited without license from IHS IS0/TR 16476:2016(E) Contents Page Foreword ..iv Introduction ..V 1 Scope. ..1 2 The VIM definition of metrological traceability 3 Challenges arising from the definition of metrological traceability .2 3.1 Conventions. .2 3.2 (C)RM as the carrier of traceable values. .3 3.3 Implicit traceability to the unit of the measurement scale. 4 3.4 Traceability networks .5 3.5 Properties expressed in units of measurement scales other than the SI 5 3.6 Properties other than quantitative. .6 3.7 Summary of an ISO/REMCO event on metrological traceability .6 4 Approaches to metrological traceability of (C)RM 4.1 General .7 4.2 Approach A. 7 4.3 Approach B .8 5 Establishing traceability of (C)RM property values (Approach B) 9 5.1 Principles. .9 5.2 Traceability pathways. .10 5.3 Steps in establishing traceability .10 5.3.1 General .10 5.3.2 Combining results. .11 5.4 Summary. .12 6 Reporting traceability ..12 6.1 Inquiry 12 6.2 Results of the inquiry 12 6.3 Requirements. ..13 6.4 Formats.. ..14 6.5 Further recommendations. ..16 Annex A (informative) Worked-out example ..17 Annex B (informative) Catalogue of analytes and measurement areas covered by WHo ..19 Annex C (informative) Example for method-independent, SI traceable values obtained by inter-laboratory comparison. .21 Bibliography ..22 ii d without license from IHS