IEC 60068-2-14 Change of Temperature Testing
IEC 60068-2-14 is a test standard designed to measure the impact of changes in temperature. The changes can be one change or a series of changes. This standard does not measure the impact of just low temperatures or high temperatures. For guidance on steady-state extreme temperature tests, other standards should be reviewed. For cold testing, please see IEC 60068-2-1 Cold Testing. For heat testing, please see IEC 60068-2-2 Heat Testing.
Temperature changes can have a significant impact on the functionality of manufactured devices. These impacts are influenced by a number of characteristics. For example, the amount of time that passes between one temperature and another can play a role. The duration at which the device is maintained at a temperature before that temperature changes is also important. The degree of the temperature change can impact the operations of devices. Another factor can be the actual number of temperature cycles that occur. Lastly, another consideration is the amount of heat transfer that happens into or from the equipment being tested.
The temperature changes that are outlined in IEC 60068-2-14 occur quite frequently. The changes can impact complete systems as well as just components. Temperature changes are initiated by a number of different factors and events. The transportation of equipment can produce large temperature changes. This is why many package testing and transit testing standards require temperature change testing. Temperature changes can also be produced during storage if a device is transported from a conditioned space to an unconditioned space.
Water can also produce temperature changes. Cold rainfall or even icing can instigate significant and sudden changes in temperature. Air can also create dramatic changes in temperature. Air temperature can have a major impact if the device is mounted on a moving device such as a train, bus, car or boat.
IEC 60068-2-14 testing is recommended for a variety of reasons. For one, it is an effective evaluation of electrical performance during a change in temperature. Another situation this standard addresses is the mechanical performance of a device during a temperature change. The electrical and mechanical performances can also be judged following specific number of rapid temperature changes.
This test standard can also assist in the determining the ability of components to withstand sudden and dramatic temperature changes. Different materials can have varying reactions when located near other materials. Also, the construction of components may have difficulty withstanding the artificial stressing of temperature changes.
Components often undergo stresses due to changing temperature when high temperatures build up in an equipment after being switched on. For instance, in the area around high wattage resistors, radiation can cause rise of surface temperature in neighboring components. It is not uncommon for other portions to remain cool despite the generated heat from other areas.
As mentioned in IEC 60068-2-22, artificially cooled components may be subjected to rapid temperature changes when the cooling system is switched on. Rapid changes of temperature in components may also be induced during manufacturing processes of equipment. Both the number and amplitude of temperature changes and the time interval between them are important.
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