1.1 这些实践包括通过标准校准装置校准和验证试验机速度的程序和要求。本规程并非试验机的完整采购规范。 1.2 这些规程适用于与试验机相关的速度应用和测量系统的验证，如刻度盘、表盘、有标记或无标记的记录仪图表、数字显示、设置等。 在所有情况下，买方/所有者/用户必须指定要验证的测速系统。 1.3 这些实践提供了针对机电试验机的指南、建议和示例。该规程也可用于验证液压试验机的执行器速度。 1.4 本标准不能用于验证与循环疲劳试验应用相关的循环计数或频率。 1.5 由于本实践中不需要换算系数，因此可以使用国际单位制（mm/min）或英制[in/min]作为标准。 1.6 速度测量值和/或试验机数据系统显示器/打印输出上的设置，无论是瞬时、延迟、存储还是重新传输，均在表1所列分类标准范围内，符合惯例 E2658 . 1.7 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和健康实践，并确定监管限制的适用性。 ====意义和用途====== 4.1 材料测试需要可重复和可预测的测试机速度。 试验机上集成的速度测量装置可用于在规定的操作范围内测量十字头速度。速度值的准确性应可追溯至国家或国际标准实验室。实践 E2658 提供验证试验机的程序，以便可以跟踪指示的速度值。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速度特性，并已根据适当的校准标准进行校准。 4.2 试验机速度的最小验证包括以下任一或两个选项: 4.2.1 验证试验机以选定速度移动十字头的能力。 4.2.2 验证试验机充分指示十字头速度的能力。 4.3 在适用的情况下，确定试验机的斜坡速度条件。这种情况可能非常重要，尤其是在验证速度快或测试持续时间很短的测试条件时。 4.4 该程序将建立实际十字头速度与试验机指示速度和/或选定设置之间的关系。正是这种关系使试验机在使用过程中获得的报告位移随时间变化的数据具有可信度。 注1: 许多材料测试从未达到预期的测试速度。除非检查材料试验的实际数据，否则通常不可能知道试验速度是否已达到或可在不同试验中重复。

1.1 These practices cover procedures and requirements for the calibration and verification of testing machine speed by means of standard calibration devices. This practice is not intended to be complete purchase specifications for testing machines. 1.2 These practices apply to the verification of the speed application and measuring systems associated with the testing machine, such as a scale, dial, marked or unmarked recorder chart, digital display, setting, etc. In all cases the buyer/owner/user must designate the speed-measuring system(s) to be verified. 1.3 These practices give guidance, recommendations, and examples, specific to electro-mechanical testing machines. The practice may also be used to verify actuator speed for hydraulic testing machines. 1.4 This standard cannot be used to verify cycle counting or frequency related to cyclic fatigue testing applications. 1.5 Since conversion factors are not required in this practice, either SI units (mm/min), or English [in/min], can be used as the standard. 1.6 Speed measurement values and or settings 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 E2658 . 1.7 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 4.1 Material testing requires repeatable and predictable testing machine speed. The speed measuring devices integral to the testing machines may be used for measurement of crosshead speed over a defined range of operation. The accuracy of the speed value shall be traceable to a National or International Standards Laboratory. Practices E2658 provides procedures to verify testing machines, in order that the indicated speed values may be traceable. A key element to having traceability is that the devices used in the verification produce known speed characteristics, and have been calibrated in accordance with adequate calibration standards. 4.2 Verification of testing machine speed at a minimum consists of either or both of the following options: 4.2.1 Verifying the capability of the testing machine to move the crosshead at the speed selected. 4.2.2 Verifying the capability of the testing machine to adequately indicate the speed of the crosshead. 4.3 Where applicable, determine the testing machine's ramp-to-speed condition. This condition can be significant especially when verifying fast speeds or testing conditions with very short testing durations. 4.4 This procedure will establish the relationship between the actual crosshead speed and the testing machine indicated speed and or selected setting. It is this relationship that will allow confidence in the reported displacement over time data acquired by the testing machine during use. Note 1: Many material tests never reach the desired test speed. Unless the actual data from the material test is examined, it is often impossible to know if the test speed has been reached or is repeatable from test to test.