ISO/TS TECHNICAL SPECIFICATION 21476 First edition 2018-12 Road vehicles Displacement calibration method of IR-TRACC devices Vehicules routiers - Méthode d'étalonnage de déplacement des dispositifs IR-TRACC Reference number IS0/TS 21476:2018(E) osi @IS02018 IS0/TS 21476:2018(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2018 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, 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 CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2018 - All rights reserved IS0/TS 21476:2018(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Symbols and abbreviated terms ..3 5 Displacement Calibration Procedure .5 5.1 Preparations .6 5.2 Test equipment set-up, power supply, voltmeter .6 5.3 Establish starting point .6 5.4 Forced Lateral Manipulation Test 5.5 Displacement Calibration Data Collection. .8 5.6 Parameter optimization and data review .9 6 Displacement Calibration Data Processing ..10 6.1 General .10 6.2 Linearization over calibration range with nominal exponent 10 6.3 Linearization optimization. 10 6.4 Data analysis and pass criteria calculations 11 6.4.1 Optimized Nominal Linearity Error .11 6.4.2 Tubes In-Out Variation .11 6.4.3 Pass-failtestsandlimits .12 6.4.4 Forced Lateral Manipulation variation. .12 6.5 Example Data.... ..12 Annex A (informative) Sensor Model Numbers .14 Annex B (informative) Example Calibration Template ..15 Bibliography ..19 @ IS0 2018 - All rights reserved ii