Overview

This document specifies the methods relating to the environmental tests of optical instruments including additional assemblies from other fields (for example, mechanical, chemical, and electronic devices), under equivalent conditions, for their ability to resist the influence of low air pressure combined with cold, including the potential condensation and freezing of water, ambient temperature, and dry or damp heat. This document is applicable to optical instruments including additional assemblies from other fields, designed for operation and/or transport in high mountainous areas or on board aircraft or missiles. The purpose of the testing is to investigate to what extent optical, climatic, mechanical, chemical, and electrical (including electrostatic) performance characteristics of the specimen are affected by combined low pressure and low, ambient, or high temperature. Furthermore, the additional effects of water condensing and freezing on the instrument or components can be determined. Examples are instruments which are installed or externally mounted on aircraft or missiles or transported inside aircraft or flying objects not providing any pressure equalization. Working Group NA 027-01-02-03 AK "Umweltbedingungen und -prüfungen für optische Geräte" ("Environmental requirements and test methods for optical instruments") at DIN Standards Committee Optics and Precision Mechanics (NAFuO) is responsible for the German contribution.

Document: references other documents

Responsible national committee

NA 027-01-02-03 AK - Environmental requirements and test methods for optical instruments  

Responsible international committee

ISO/TC 172/SC 1/WG 3 - Environmental test methods