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Temperature Humidity Chambers To Test The Reliability Of Electronic Products
Temperature Humidity chambers are used to perform various tests to determine the reliability of the electronics products that have been designed before they are allowed to go into mass production. One of the main usage of the chamber is to do temperature and humidity cycling. This test is to ensure that the electronic device will survive those environmental conditions expected during the storage, shipping and operational periods of the device. In the control of humidity, it is not necessary to control it when the temperature is 0 Celcius and below. Allowing the
relative humidity to go below 10% is good enough. At temperature of 50 Celcius and above, the control of relative
humidity is needed to prevent condensation on the electronic devices under test. After a period of high temperature and
high relative humidity, it is necessary to dry out the chamber to the lowest possible RH(relative humidity) before reducing
the temperature to avoid any condensation on the device under test. Some examples of the test standard that one can
consider is listed below. However, it is always better to check the test standards and methods from reliable sources like
IEC
and
ASTM.
Table below shows an example of a temperature/humidity settings to test the shipping environment that an electronic
products may be subjected to. The parameters may be changed according to the products that are tested. At the end of
the test, a performance test should be performed to check the operations of the device. 
Example of Temp/Humidity Cycle Of Operational Environment
Table below shows an example of a temperature/humidity cycle to test the operational environment that an electronic
products may be subjected to. The parameters may be changed according to the products that are tested. At the end of
the test, a performance test should be performed to check the operations of the device. The device should be powered
up during the entire duration of the test with maximum loading. The input power supply should be adjusted to input AC
power line plus 15% at 50 degree Celcius and AC power line minus 15% at 0 degree Celcius. The cycle should be
repeated for at least 60 cycles. 
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