1.1 本指南描述了测试方法的评估、校准和相关性 E274/E274M 在ISO 17025认证的现场测试中心（FTC）进行的摩擦测量系统。 2. 使用每个FTC可用的专用设备、设施、表面、训练有素的人员和区域参考摩擦测量系统（ARFMS）进行评估、校准和关联过程，使用以下程序进行。 1.2 FTC符合指南的要求 E1890 . 指导 E1890 需要更严格的校准过程，并要求所有ARFMS系统每年在三个表面上以三种速度相互关联一次，每次重复12次，总共108对。 1.3 本指南作为识别和量化影响系统性能的变量的过程提供，以最小化这些变量的影响，并提供一种方法来关联测试方法 E274/E274M 摩擦测量系统至参考摩擦测量系统。 1.4 以英寸表示的值- 磅单位应视为标准单位。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 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====== 5.1 路面的摩擦特性由摩擦测量系统测量，使用这些系统的操作程序见试验方法 E274/E274M . 然而，随着时间的推移，可能会出现机械或电子系统异常，导致测量误差或不准确。这要求定期评估、校准和关联这些系统中的每一个。校准间隔取决于使用频率、维护和其他因素。 如果对系统进行任何可能影响校准的维修，则应在进一步使用之前重新校准系统。通常，建议其中一个FTC每年进行校准和关联。 5.2 本指南定义了确保测试方法 E274/E274M 系统通过关联测试方法产生一致且准确的数据 E274/E274M 符合国家标准试验方法的系统 E274/E274M 系统。

1.1 This guide describes the evaluation, calibration, and correlation of Test Method E274/E274M friction measurement systems as conducted at an ISO 17025 accredited field test center (FTC). 2 The evaluation, calibration, and correlation process, using the specialized equipment, facilities, surfaces, trained personnel, and area reference friction measurement systems (ARFMS) available at each FTC, are conducted using the procedures described below. 1.2 The FTC complies with the requirements of Guide E1890 . Guide E1890 requires a more stringent calibration process and requires all ARFMS systems be correlated together once a year on three surfaces at three speeds with twelve repeats each for a total of 108 pairs. 1.3 This guide is offered as a process to identify and quantify the variables that affect system performance, to minimize the effect of these variables, and to provide a means to relate Test Method E274/E274M friction measurement systems to reference friction measurement systems. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 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 ====== 5.1 Friction characteristics of road surfaces are measured by friction measurement systems, and the operating procedure for the use of these systems is found in Test Method E274/E274M . However, over time, mechanical or electronic system anomalies may develop, resulting in measurement errors or inaccuracies. This requires that each of these systems be evaluated, calibrated, and correlated on a regular basis. The interval between calibrations depends on the frequency of use, maintenance, and other factors. If any repairs are made to the system that may affect the calibration, the system should be recalibrated before further use. Generally, calibrations and correlations are recommended to be performed on an annual basis by one of the FTCs. 5.2 This guide defines the process of ensuring that Test Method E274/E274M systems produce consistent and accurate data by correlating the Test Method E274/E274M systems to national standard Test Method E274/E274M systems.