NBN ISO 9022-23:2021

This part of ISO 9022 specifies the methods relating to the environmental tests of optical instruments
including additional assemblies from other fields (e.g. mechanical, chemical, and electronic devices),
under equivalent conditions, for their ability to resist the influence of low pressure combined with
cold, including the potential condensation and freezing of moisture, ambient temperature, and dry or
damp heat.
This part of ISO 9022 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
moisture 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.
Annex A explains the intent of the different types of tests.