1.1 本规范涵盖了静态和准静态扭矩试验机扭矩校准的程序和要求。这些装置可以具有扭矩指示系统，也可以不具有扭矩指示系统，并且包括用于校准手动扭矩工具的那些装置。测试机器可以通过以下三种方法之一或其组合进行校准: 1.1.1 使用标准配重和杠杆臂。 1.1.2 弹性扭矩测量装置的使用。 1.1.3 弹性力测量装置和杠杆臂的使用。 1.1.4 任何方法都需要特定的测量不确定度，显示对国际单位制(SI)的计量可追溯性。 附注1: -有关术语计量可追溯性的进一步定义，请参阅最新修订的JCGM 200:国际计量词汇-基本和一般概念及相关术语（VIM）。 1.2 的程序 1.1.1 , 1.1.2 ，和 1.1.3 适用于与试验机相关的扭矩指示系统的校准，如刻度、刻度盘、有标记或无标记的记录图表、数字显示器等。在所有情况下，买方/所有者/用户必须指定要校准的扭矩指示系统并将其包括在报告中。 1.3 由于本实践中不需要换算系数，因此可以使用英制单位、公制单位或SI单位作为标准。 1.4 测试机数据系统的显示器/打印输出上指示的扭矩值——无论是瞬时的、延迟的、存储的还是重传的——根据以下规定进行校准 1.1.1 , 1.1.2 或者 1.1.3 或其组合，且在读数精度要求的±1%以内，符合本惯例。1.5 以下内容适用于本标准中规定的所有限值:为了确定是否符合这些质量标准，观察值或计算值应按照惯例的四舍五入方法，在表示质量标准限值时使用的右手最后一位数字中“最接近的单位” E29 ，用于使用测试数据中的有效数字来确定是否符合质量标准。 1.6 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 1.7 本国际标准是根据世界贸易组织发布的关于制定国际标准、指南和建议的原则的决定中确立的国际公认的标准化原则制定的贸易技术壁垒委员会。 ======意义和用途====== 4.1 施加和指示扭矩的测试机以多种方式用于许多行业。它们可以在研究实验室中用于测量材料特性，也可以在生产线中用于确定产品的装运资格。无论机器的最终用途是什么，用户都需要知道所施加的扭矩量，并且扭矩值的准确性可以追溯到SI。本标准提供了验证这些机器和设备的程序，以便指示的扭矩值可以追溯。具有计量可追溯性的关键要素是校准中使用的设备产生已知的扭矩特性，并且已经根据实践进行了校准 E2428 . 4.2 本标准可由扭矩测试机器或设备及相关仪器的使用者、制造者和提供校准服务的人使用。

1.1 This practice covers procedures and requirements for the calibration of torque for static and quasi-static torque capable testing machines. These may, or may not, have torque indicating systems and include those devices used for the calibration of hand torque tools. Testing machines may be calibrated by one of the three following methods or combination thereof: 1.1.1 Use of standard weights and lever arms. 1.1.2 Use of elastic torque measuring devices. 1.1.3 Use of elastic force measuring devices and lever arms. 1.1.4 Any of the methods require a specific uncertainty of measurement, displaying metrological traceability to The International System of Units (SI). Note 1: – for further definition of the term metrological traceability, refer to the latest revision of JCGM 200: International vocabulary of metrology — Basic and general concepts and associated terms (VIM). 1.2 The procedures of 1.1.1 , 1.1.2 , and 1.1.3 apply to the calibration of the torque-indicating systems associated with the testing machine, such as a scale, dial, marked or unmarked recorder chart, digital display, etc. In all cases the buyer/owner/user must designate the torque-indicating system(s) to be calibrated and included in the report. 1.3 Since conversion factors are not required in this practice, either english units, metric units, or SI units can be used as the standard. 1.4 Torque values indicated on displays/printouts of testing machine data systems—be they instantaneous, delayed, stored, or retransmitted—which are calibrated with provisions of 1.1.1 , 1.1.2 or 1.1.3 or a combination thereof, and are within the ±1 % of reading accuracy requirement, comply with this practice. 1.5 The following applies to all specified limits in this standard: For purposes of determining conformance with these specifications, an observed value or a calculated value shall be rounded “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding method of Practice E29 , for Using Significant Digits in Test Data to Determine Conformance with Specifications. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 Testing machines that apply and indicate torque are used in many industries, in many ways. They may be used in a research laboratory to measure material properties, and in a production line to qualify a product for shipment. No matter what the end use of the machine may be, it is necessary for users to know the amount of torque that is applied, and that the accuracy of the torque value is traceable to the SI. This standard provides a procedure to verify these machines and devices, in order that the indicated torque values may be traceable. A key element to having metrological traceability is that the devices used in the calibration produce known torque characteristics, and have been calibrated in accordance with Practice E2428 . 4.2 This standard may be used by those using, those manufacturing, and those providing calibration service for torque capable testing machines or devices and related instrumentation.