ASTM_F_1971_-_12.pdf

Designation:F197112Standard Test Method forElectrical Resistance of Tires Under Load On the TestBench1This standard is issued under the fixed designation F1971;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the measurement of the electri-cal resistance between the wheel of a mounted and inflatedtire-wheel assembly and a flat conducting surface in loadedcontact with the tire.1.2 This test method specifies procedures and equipmentsuch that electrical resistance can be accurately determined fortires with values up to 1012(ohms).1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:F538 Terminology Relating to the Characteristics and Per-formance of Tires22.2Other Standards:The Tire and Rim Association Inc.Yearbook(TRA),currentissue3The European Tyre and Rim Technical Organization(ETRTO),current issue4The Japan Automobile Tire Manufacturers Association,Inc.Yearbook(JATMA),current issue5International Standard ISO 16392 Electrical ResistanceTest Methods to Measure the Electrical Resistance ofTyres on a Test Rig6Wirtschaftsverband der deutschen Kautschukindustrie e.V.(W.d.K)110 Measurement of the Electrical Resistance ofTyres3.Terminology3.1 Definitions:3.1.1 connection point,nany point on the wheel or metalloading plate where the resistance measuring instrumentsleads are connected.F5383.1.2 rim,nthe specially shaped circular periphery towhich a tire may be mounted with appropriate bead fitment.F5383.1.3 test load,nthe force applied to a tire through therim;it is normal to the metal loading plate onto which the tireis loaded.F5383.1.4 tire electrical resistance,nthe electrical resistance inohms()measured between the wheel of a mounted andinflated tire-wheel assembly and a metallic plate onto whichthe tire is loaded at a specified load.F5383.1.5 wheel,na rigid structure consisting of a rim con-nected to a central disk that permits rotationally centeredattachment to an axle.F5383.1.6 For additional definitions of terms used in this testmethod,refer to Terminology F538.4.Summary of Test Method4.1 The electrical resistance of an inflated tire-wheel assem-bly(see Note 1)is measured between the wheel and theconducting surface against which the tire is loaded.Thismeasurement involves the use of an appropriate resistancemeter and voltage application system,as well as a special testfixture or measuring stand.1This test method is under the jurisdiction of ASTM Committee F09 on Tiresand is the direct responsibility of Subcommittee F09.30 on Laboratory(Non-Vehicular)Testing.Current edition approved May 1,2012.Published July 2012.Originally approvedin 1999.Last previous edition approved in 2005 as F1971 05.DOI:10.1520/F1971-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from the Tire and Rim Association,Inc.,175 Montrose West Ave.,Suite 150,Copley,OH 44321.4Available from the European Tyre and Rim Technical Organization,32/2avenue Brugmann,B-1060 Brussels,Belgium.5Available from the Japan Automobile Tire Manufacturers Association,No.33Mori Building,8thFloor,3-8-21 Toranomon,Minato-Ku,Tokyo,Japan 105-0001.6Available from International Organization for Standardization(ISO),1 rue deVaremb,Case postale 56,CH-1211,Geneva 20,Switzerland.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE1A tire mounted on an approved wheel and inflated to aspecified pressure.5.Significance and Use5.1 Occasions exist where static charges on the vehicle mustbe dissipated by way of the tires.Electrical resistance inverselymeasures the tires ability to dissipate static charge from thevehicle.6.Apparatus6.1 ResistanceMeasuringInstrument(ohmmeter)Resistance shall be measured by a commercial instrumentcapable of measuring electrical resistance in ohms and havinga power source capable of 1000 V.The voltage shall becontrolled as described in Table 1 and shall not dissipate morethan 3 W in the test sample.The instrument shall be capable ofdetermining the resistance up to a value of 1012 with anaccuracy of 62%.The input impedance shall be at least 1016.6.2 Metal Loading PlateA flat plate of dimensions suffi-cient to encompass the entire con