1.1 本规程涵盖静态和准静态扭矩能力试验机的扭矩校准程序和要求。这些可能有或没有扭矩指示系统，包括用于校准手动扭矩工具的设备。试验机可通过以下三种方法之一或其组合进行校准: 1.1.1 使用标准砝码和杆臂。 1.1.2 弹性扭矩测量装置的使用。 1.1.3 弹性测力装置和杆臂的使用。 1.1.4 任何方法都需要特定的测量不确定度，显示国际单位制（SI）的计量溯源性。 注1: –有关术语计量可追溯性的进一步定义，请参阅JCGM 200的最新版本:国际计量词汇-基本和一般概念及相关术语（VIM）。 1.2 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，如刻度盘、刻度盘、有标记或无标记的记录仪图表、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，并将其包含在报告中。 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、公制单位或国际单位作为标准。 1.4 试验机数据系统的显示器/打印件上显示的扭矩值，无论是瞬时、延迟、存储或重新传输的，均按照以下规定进行校准: 1.1.1 , 1.1.2 或 1.1.3 或其组合，且在±1范围内 % 对于阅读精度要求，请遵守本规程。 1.5 以下内容适用于本标准中的所有规定限值:为了确定是否符合这些规范，应将观察值或计算值四舍五入到最后右侧的“最接近的单位”- 根据实践中的舍入方法，用于表示规格极限的手数字 E29年 ，用于使用测试数据中的有效数字来确定是否符合规范。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 应用和指示扭矩的试验机在许多行业中以多种方式使用。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鉴定产品的装运质量。无论机器的最终用途是什么，用户都有必要知道施加的扭矩量，并且扭矩值的准确性可追溯到SI。本标准提供了验证这些机器和设备的程序，以便可以跟踪指示的扭矩值。 具有计量可追溯性的一个关键因素是，校准中使用的设备产生已知的扭矩特性，并已根据实践进行校准 E2428 . 4.2 本标准可供使用、制造和提供扭矩试验机或装置及相关仪器校准服务的人员使用。

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.