本文叙述了采用标准探测器由辐射度单位导出弱光光度标准的原理、方法及实验装置。该标准的总不确定度为±1％。同时还介绍了为定标弱光光度计而专门研制的弱光标推测试台,其总不确定度为±2.2％。 This paper describes the principle, method and experimental device of using standard detector to derive low light photometric standard from radiometric unit. The standard’s total uncertainty is ± 1%. At the same time, we also introduce the weak cursor speculative test bench specially developed for the calibration of low light photometer, whose total uncertainty is ± 2.2%.