1.1 这些实践包括通过静态和准静态试验机的标准校准装置校准和验证位移测量系统的程序和要求。本规程并非试验机或位移测量系统的完整采购规范。位移测量系统不用于测定应变。参见练习 E83 . 1.2 这些程序适用于与试验机相关的位移测量系统的验证，如刻度盘、表盘、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/业主/用户必须指定待验证的位移测量系统。 1.3 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。 将两个系统的值合并可能会导致不符合标准。 1.4 试验机数据系统的显示器/打印件上显示的位移值，无论是瞬时、延迟、存储或重新传输的，均在中列出的分类标准内 表1 ，遵守惯例 E2309/E2309M . 1.5 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。 1.6 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 应用和测量位移的试验机用于许多行业。它们可以在研究实验室中用于确定材料特性，也可以在生产线中用于确认产品是否符合装运条件。与试验机集成的位移测量装置可用于在规定的操作范围内测量十字头或致动器位移。位移值的准确性应可追溯至美国国家标准与技术研究所（NIST）或其他公认的国家实验室。实践 E2309年 提供了验证这些机器和系统的程序，以便可以跟踪测量的位移值。具有可追溯性的一个关键因素是，验证中使用的设备产生已知的位移特性，并已根据适当的校准标准进行校准。

1.1 These practices cover procedures and requirements for the calibration and verification of displacement measuring systems by means of standard calibration devices for static and quasi-static testing machines. This practice is not intended to be complete purchase specifications for testing machines or displacement measuring systems. Displacement measuring systems are not intended to be used for the determination of strain. See Practice E83 . 1.2 These procedures apply to the verification of the displacement measuring 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 displacement-measuring system(s) to be verified. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.4 Displacement values indicated on displays/printouts of testing machine data systems—be they instantaneous, delayed, stored, or retransmitted—which are within the Classification criteria listed in Table 1 , comply with Practices E2309/E2309M . 1.5 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. 1.6 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 measure displacement are used in many industries. They may be used in research laboratories to determine material properties, and in production lines to qualify products for shipment. The displacement measuring devices integral to the testing machines may be used for measurement of crosshead or actuator displacement over a defined range of operation. The accuracy of the displacement value shall be traceable to the National Institute of Standards and Technology (NIST) or another recognized National Laboratory. Practices E2309 provides a procedure to verify these machines and systems, in order that the measured displacement values may be traceable. A key element to having traceability is that the devices used in the verification produce known displacement characteristics, and have been calibrated in accordance with adequate calibration standards.