GB/T 15078-2021 English PDFUS$179.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 15078-2021: Testing method for contact resistance of precious metals electrical contact materials Status: Valid GB/T 15078: Historical versions
Basic dataStandard ID: GB/T 15078-2021 (GB/T15078-2021)Description (Translated English): Testing method for contact resistance of precious metals electrical contact materials Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: H21 Word Count Estimation: 9,953 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 15078-2021: Testing method for contact resistance of precious metals electrical contact materials---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Testing method for contact resistance of precious metals electrical contact materials ICS 77.120.99 CCSH21 National Standards of People's Republic of China Replace GB/T 15078-2008 Method for measuring contact resistance of noble metal electrical contact materials Released on 2021-08-20 2022-03-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee ForewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document replaces GB/T 15078-2008 "Measurement method of contact resistance of precious metal electrical contact materials", and GB/T 15078-2008 In comparison, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) Added the test at 10℃~40℃ (see Chapter 5); b) The recommended value is changed to 3.3μm/s (see 6.2.5,.2008 edition 5.2.5); c) The requirements for potential leads have been changed (see 6.4.3,.2008 edition 5.4.3); d) The requirements for specimens and probes, and specific observation methods for the cleanliness of the specimen surface have been added (see 7.4); e) Increased non-obvious air flow (see 8.1.1); f) Added description of 1cN=10-2N (see 8.1.2); g) Changed the sequence of power on and equipment preheating (see 8.3.3,.2008 edition 7.3.3); h) Added that K3 is placed in the standard resistance selection position and the interval is 10s, and then the probe is raised (see 8.4.1); i) Changed the order from low to high (see 8.4.3,.2008 edition 7.4.3); j) Change the unit of resistance Rn, Rc, Rci to "ohm (Ω)" (see 9.1); k) Added that as the measurement current and measurement pressure increase, the contact resistance will decrease and the increase in contact time appears to be rapid first Decrease, and then gradually stabilize the decay process, based on this feature, you can select the appropriate contact pressure, test current and test time Conditions to reduce the influence of these main factors on the measurement of contact resistance (see 9.3); l) The content of the test report is changed (see Chapter 10, Chapter 9 of the.2008 edition). Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed by China Nonferrous Metals Industry Association. This document is under the jurisdiction of the National Non-ferrous Metals Standardization Technical Committee (SAC/TC243). Drafting organizations of this document. Guiyan Platinum Industry Co., Ltd., Harbin Institute of Technology, Kunming Guiyan Jinfeng Technology Co., Ltd., Northwest Nonferrous Metal Research Institute, Xi'an Ruixinke Metal Materials Co., Ltd., Guiyan Zhongxi (Shanghai) New Material Technology Co., Ltd., Non-ferrous Metal Technology Economic Research Institute Co., Ltd. The main drafters of this document. Chen Song, Ren Wanbin, Ma Jun, Chen Wen, Zheng Jing, Yin Kejiang, Xie Ming, Wang Jingkun, Zhu Wuxun, Xiang Lei, Wu Qingwei. The previous versions of the documents replaced by this document are as follows. ---It was first published as GB/T 15078-1994 in.1994 and revised for the first time in.2008; ---This is the second revision. Method for measuring contact resistance of noble metal electrical contact materials Warning---The personnel using this document should have practical experience in formal laboratory work. This document does not indicate all possible safety issues question. The user is responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated by relevant national laws and regulations.1 ScopeThis document specifies the method for measuring the contact resistance of noble metal electrical contact materials (static). This document applies to the measurement of the contact resistance of noble metal electrical contact materials. Other metal and alloy electrical contact materials can also be used as reference.2 Normative referencesThe contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. GB/T 8170 Numerical rounding rules and the expression and determination of limit values3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Static contact The contacts are in static contact with each other, and there is no continuous clutch action. 3.2 Constrictionresistance When the current passes through the contact surface, the resistance increase caused by the sharp contraction of the current wire. 3.3 Membrane resistance The resistance produced by the contact surface film. 3.4 Contact resistance The total resistance generated at the contact point when current passes through the contact, including shrinkage resistance and membrane resistance. The total resistance value is the sum of the two resistances. 3.5 Bulkresistance The resistance generated after the current flows through the contact material itself, its value is proportional to the resistivity and length of the material, and inversely proportional to the cross section. 3.6 Probe A device for measuring the contact resistance of a sample. Its basic shape is a cone, mainly cones and pyramids. When measuring, the tip of the cone is straight. The contact is in contact with the surface to be measured of the sample, and the surface of the sample is used as the reference surface. The reference surface can be of different shapes. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 15078-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 15078-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. 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Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version GB/T 15078-2021?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 15078-2021 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
