1.1 本规程涵盖了在受快速热变化影响的环境（如火箭发动机、大气再入、电弧等离子体加热器等）中测试低电导率试样的方法。具体来说，讨论了适用于护套型热电偶的裸线热电偶仪表的实践。 1.2 以英寸-磅为单位的数值应视为标准值。英寸-磅单位的公制等价物可能是近似值。 1.3 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。 1.4 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====== 2.1 在飞行器和地面试样上进行内部温度测量；此外，由于温度测量对各种导弹和航天器隔热罩的设计非常重要，因此必须注意将获得这些测量的误差源降至最低。 2.2 在过去几年中，使用热电偶在低温下获得准确温度测量的问题- 许多人研究了电导率样本，以隔离误差来源，并建立改进的温度测量技术。本文列出了主要的误差来源，并给出了解决这些问题的建议。

1.1 This practice covers methods for instrumenting low-conductivity specimens for testing in an environment subject to rapid thermal changes such as produced by rocket motors, atmospheric re-entry, electric-arc plasma heaters, and so forth. Specifically, practices for bare-wire thermocouple instrumentation applicable to sheath-type thermocouples are discussed. 1.2 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may be approximate. 1.3 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. 1.4 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 ====== 2.1 Internal temperature measurements are made on both in-flight vehicles and on-ground test specimens; and, because of the importance of the temperature measurements to the design of various missile and spacecraft heat shields, it is essential that care be taken to minimize the sources of error in obtaining these measurements. 2.2 Over the past several years, the problems of using thermocouples to obtain accurate temperature measurements in low-conductivity specimens have been studied by various people to isolate the sources of error and to establish improved temperature measurement techniques. The major sources of error are listed in this document and recommended solutions to the problems are given.