GB/T 12085.3-2022 "Optics and photonics – Environmental test methods – Part 3: Mechanical stress" is part of the GB/T 12085 series of standards. It specifies uniform test methods for evaluating the resistance of optical and photonic instruments and their components (such as mechanical, chemical, and electronic equipment parts) to mechanical stress. This standard primarily describes procedures for applying mechanical conditions such as shock (e.g., bump, free fall) and vibration (including sinusoidal and random vibration) to test specimens, in order to assess the functional and performance stability of the specimens under these mechanical stress environments. The core testing instruments involved in conducting these tests include shock test machines for impact testing, vibration test systems for vibration testing, and related mechanical testing equipment used to simulate environments such as rough handling.