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GB/T 351-2019: Metallic Materials - Resistivity Measurement Method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 351: Historical versions
GB/T 351-2019: Metallic Materials - Resistivity Measurement Method---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT351-2019NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.040.99 H 21 Replacing GB/T 351-1995 Metallic Materials - Resistivity Measurement Method Issued on. MARCH 25, 2019 Implemented on. FEBRUARY 01, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of PRC. Table of ContentsForeword... 3 1 Scope... 4 2 Normative References... 4 3 Terms and Definitions... 4 4 Test Equipment... 5 5 Sample... 6 6 Test... 6 7 Test Results and Calculation... 10 8 Test Records and Reports... 13 Appendix A (Informative) Schematic Diagram of the Common Conductor Clamping Tool... 15ForewordThis Standard was drafted as per the rules specified in GB/T 1.1-2009. This Standard replaces GB/T 351-1995 Metallic Materials – Resistivity Measurement Method. Compared with GB/T 351-1995, this Standard has the major technical content changes besides the editorial modification. --- Modify the standard name; --- Delete the definitions of link resistance and lead resistance; --- Add the definitions and calculation methods of conductivity, conductivity percent IACS, and direct-current resistance ratio; --- Modify the production inspection into routine inspection; --- Modify the temperature control of the routine inspection from 10°C~35°C into (20±5) °C; --- Modify the temperature control of the arbitration inspection from (20±5) °C into (20±1) °C; --- Add the length measurement tool Vernier caliper; --- Add the numerical rounding off on the test results and the calculation; --- Add the schematic diagram of the common conductor clamping tool (see Appendix A). This Standard was proposed by China Iron and Steel Industry Association. This Standard shall be under the jurisdiction of National Technical Committee for Standardization of Steels (SAC/TC 183). Drafting organizations of this Standard. National Quality Supervision and Inspection Center for Metal Products; Shougang Group; China Metallurgical Construction Research Institute Ltd.; and China Metallurgical Information and Standardization Institute. Chief drafting staffs of this Standard. Wang Jun, Su Jianfeng, Gong Jian, Wang Yujie, Guo Miao, Yin Yahao, Shi Jianrui, Guo Jifei, Liu Baoshi, and Wang Wenzhong. The historical edition replaced by this Standard is as follows. --- GB/T 351-1995. Metallic Materials - Resistivity Measurement Method1 ScopeThis Standard specifies the terms and definitions, test equipment, sample, test, test results and calculation, test records and reports for the resistivity measurement of the metallic materials. This Standard is applicable to the measurement of the electrical properties such as volume resistivity, mass resistivity, electrical conductivity and direct-current resistance ratio, etc. The method provided in this Standard is an arbitration measurement method and a conventional measurement method for measuring the resistivity, under the standard conditions, in a range of 0.01Ω•mm2/m ~ 2.0Ω•mm2/m.2 Normative ReferencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document. YB/T 081 Rule for Rounding Off of Numerical Values and Judgement of Testing Values for Technical Standards of Metallurgy3 Terms and DefinitionsFor the purposes of this document, the following terms and definitions apply. 3.1 Resistance per unit length It indicates, at the temperature of 20°C, the resistance of a conductor per unit length. 3.2 Volume resistivity It indicates, at the temperature of 20°C, the resistance of conductor per unit length and per unit cross-sectional area. 3.6 Direct-current resistance ratio Under the same twice conditions, for the different positions of the same sample, or different processes of the same sample on the same position, the ratio of the DC resistance measurement results. 3.7 Wheatstone bridge For a single-arm bridge, there are only two contacts during measuring the resistance, which is called two-contact method. Generally, it is used to measure the higher resistance. 3.8 Kelvin bridge For the double-arm bridge, there are four contacts during measuring the resistance, which is called four-contact method. Generally, it is used to measure the lower resistance.4 Test Equipment4.1 When the sample resistance is less than 10Ω, the Kelvin bridge shall be used; when the sample resistance is no less than 10Ω, the Wheatstone bridge shall be used. Other instruments that conform to the provisions of 4.4 can also be used. 4.2 When clamping the sample by the special tool, the blades on the voltage terminals shall be sharp and parallel to each other, and perpendicular to the same axis. See Appendix A for a schematic diagram of common conductor clamping tools. 4.5 Thermometer. the indication error shall not exceed 0.1°C. 4.6 Micrometer. the minimum division value shall not exceed 0.01mm. Vernier caliper. the minimum division value shall not exceed 0.1mm.5 Sample5.1 The sample shall be straight. When the sample can’t be straightened by hand, place it on the surface of a soft material such as wood or rubber, and straightened with a slight force by a wooden hammer or a rubber hammer. 5.2 The surface of the sample shall be free of visible cracks or defects with a length greater than 1mm, as well as grease, rust and other contaminants to ensure good contact.6 Test6.1 Temperature control The routine test shall be performed at (20±5) °C; and the temperature shall remain stable during the measurement. 6.2 Length measurement Under the test temperature, measure the sample length L1, and the gauge length L2 between tow voltage terminals. 6.3 Cross-sectional area calculation 6.3.1 Measurement method 6.6 Measurement error Each measurement error shall conform to the provisions of Table 1.7 Test Results and Calculation7.1 General requirements The standard temperature specified in this Standard is 20°C. When the ambient temperature deviates from the standard temperature, according to the resistance and linear size change with the temperature, the resistance value measured at temperature t shall be converted to the resistance value at the standard temperature of 20°C. 7.2 Calculation of standard temperature resistance At the standard temperature of 20°C, the resistance on the gauge length of the sample Parameters Arbitration test Routine test 7.8 Calculation of direct-current resistance ratio At the standard temperature of 20°C, the direct-current resistance ratio of the sample shall be calculated as per Formula (11). 7.9 Numerical rounding off The results of the test measurement shall be rounded off according to the requirements of relevant product standards. If there are no specific provisions of the product standards, it shall be rounded off according to the provisions of YB/T 081.8 Test Records and Reports8.1 The test records generally include the following contents. 8.2 The test reports generally include the following contents.Appendix A(Informative) Schematic Diagram of the Common Conductor Clamping Tool A.1 See Figure A.1 for the schematic diagram of clamping tool on the voltage and current measuring terminals of the sample with circular or square cross-section. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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