The main purpose of the temperature/high altitude (low air pressure) test is to simulate the air transportation environment under pressure less control, avionics, products with high pressure, motor or sealed considerations, and products installed in high altitude area. Due to the low air Pressure/high altitude environment, the slow air flow makes poor heat-dissipation and raises the temperature of product. This phenomenon is the most common cause of functional failure; unstable motor operation and Arcing effect/Corona effect on high power components are also general phenomenon in low air pressure environments.

The International Electrotechnical Commission (IEC) has recommended testing procedure for pre-test treatment, post-test treatment, temperature and air pressure changes, etc. For example, in a low-pressure environment, temperature transmission is not easy, so before air pressure changes, It is recommended to execute the temperature change first, make the product temperature reach the testing condition and then, execute pressure change. (See the example below)

 

 

<Temperature / Altitude Test Profile Example>
 

In addition, there are mostly 2 kinds of test application: Transportation environment Test and Operating Environment Test. The transportation environment usually accompanies with low temperature and low air pressure as validation conditions, and  operating environment accompanies with high/low temperature and low air pressure.

 

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