This standard is an important part of the environmental testing series for optical and photonic instruments, specifically regulating the testing methods for devices under environmental conditions involving three forms of condensation: dew, frost, and ice. It aims to evaluate the tolerance and reliability of optical instruments and various related components (such as mechanical, chemical, and electronic parts) when exposed to harsh conditions like surface condensation, frost formation, or ice buildup. During testing, environmental test chambers capable of precisely controlling temperature and humidity (such as high-low temperature and humidity test chambers) are typically required to simulate specific temperature and humidity conditions, thereby generating the desired dew, frost, or ice phenomena. This standard is a modified adoption of the corresponding international standard and provides a unified and critical testing basis for the environmental adaptability design, verification, and quality evaluation of related products.