ISO INTERNATIONAL STANDARD 17657-3 First edition 2005-09-15 Resistance welding Welding current measurement for resistance welding - Part 3: Current sensing coil Soudage par resistance-Mesurage des courants en soudage par resistance Partie3:Toredemesuredecourant Reference number ISO 17657-3:2005(E) @ISO2005 ISO17657-3:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation the unlikely event that a problem relating to it is found, please infom the Central Secretariat at the address given below. ISO2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, IsO's member body in the country of the requester. ISO copyright office Case postale 56·CH-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ ISO 2005 - All rights reserved ISO 17657-3:2005(E) Contents Page Foreword. Introduction 1 Scope 2 Normative references 3 Terms and definitions. 4 Physical environment and operating conditions... 5 Classificationof current sensing coilsand designation of product.... 5.1 Class of current sensing coils..... 5.2 Standardvalues ofthe conversion coefficient. 5.3 Designation of products.... 6 Requirementsforcurrentsensingcoils 6.1 Currentsensing coiland connectinglead 6.2 Conversion coefficient.. 6.3 Measuringaccuracy 6.4 Mechanical strength .. 6.5 Setting position error 6.6 Influenceofambienttemperature 6.7 Thermal propertyof covermaterials 6.8 7 Test procedures. 7.1 Conversion coefficient 7.2 Measuring accuracy.. 7.3 Mechanical tests.... 7.4 Settingpositionerrortest. 7.5 Thermal test. 7.6 Contacttest. 8 8 Marking ..... 8 Annex A (informative) Design of current sensing coils ... 9 AnnexB(informative)Governingparametersoftheconversioncoefficient 12 AnnexD(informative)Frequencyresponseofcurrentsensingcoils.. 17 @ IS 2005 - All rights reserved ili ISO17657-3:2005(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO17657-3waspreparedbyTechnicalCommitteeISO/TC44,Weldingandalliedprocesses,Subcommittee SC 6, Resistance welding. Iso 17657 consists of the following parts, under the general title Resistance welding- Welding current measurementforresistance welding: Part1:Guidelinesformeasurement Part 2: Welding current meter with current sensing coil Part3:Current sensing coil Part 4:Calibration system 一 Part 5:Verification of welding current measuring system iv @ ISO 2005 All rights reserved ISO 17657-3:2005(E) Introduction Requests s for official interpretations of any aspect of this part of IsO 17657 should be directed to the found at http://www.iso.org. @ ISO 2005 - All rig