1.1 本规范涵盖交流电气系统上使用的便携式、带电工具支持的两极相位测试仪。 1.2 提供两种类型的相位测试仪，指定为I型电阻式和II型电容式。 1.3 提供了两种类型的相位测试仪，分别指定为A型数字和B型音频/视频。 1.4 这些高压定相测试仪和任何必要的绝缘工具手柄的使用和维护不在本规范的范围内。 1.5 以英寸-磅为单位的数值应视为标准值。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。 1.6 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。 注1: 除非另有规定，本规范中定义的所有电压均指三相系统中的相间电压。本规范涵盖的定相测试仪可用于三相系统以外的系统，但应使用适用的相间或相对地（地）电压来确定工作电压。 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。

1.1 This specification covers portable, live-line tool-supported two-pole phasing testers to be used on AC electrical systems. 1.2 Two types of phasing testers are provided and are designated as Type I Resistive and Type II Capacitive. 1.3 Two styles of phasing testers are provided and are designated as Style A Numerical and Style B Audible/Visual. 1.4 The use and maintenance of these high voltage phasing testers and any necessary insulated tool handles are beyond the scope of this specification. 1.5 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. 1.6 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. Note 1: Except where specified, all voltage defined in this specification refers to phase-to-phase voltage in a three-phase system. Phasing Testers covered by this specification may be used in other than three-phase systems, but the applicable phase-to-phase or phase-to-ground (earth) voltages shall be used to determine the operating voltage. 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.