1.1这些试验方法包括通过便携式检查仪表仪器测定表面的总法向发射度（注）。注1总法向发射度( N )定义为在相同温度下，样本的法向辐射与黑体辐射器的法向辐射之比。相关方程 N 波长和光谱法向发射度[ N （）]是 等式1-（见注释1和E408-71（2002）正文中的等式） 1.2当必须进行快速测量且需要进行无损检测时，这些试验方法适用于大表面的测量。它们对于生产控制测试特别有用。 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。

1.1 These test methods cover determination of the total normal emittance (Note) of surfaces by means of portable, inspection-meter instruments. Note 1Total normal emittance ( N ) is defined as the ratio of the normal radiance of a specimen to that of a blackbody radiator at the same temperature. The equation relating N to wavelength and spectral normal emittance [ N ()] is Equation 1 - (See Note 1 and equation in body of E408-71(2002).) 1.2 These test methods are intended for measurements on large surfaces when rapid measurements must be made and where a nondestructive test is desired. They are particularly useful for production control tests. 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.