HALT - Rapid Thermal Transitions

Rapid Thermal Transitions consists of extreme temperature cycling between the operating limits identified during cold and hot step testing. The unit is functionally tested throughout the entire process, including dwells, and transitions.

Brief Rapid Thermal Transitions Summary

The Unit Under Test (UUT) is positioned inside the HALT chamber where it will receive uniform airflow. Temperature limits are defined based upon the Lower and Upper Operating Limits achieved during the cold and hot step stress.

The temperature is then rapidly cycled from the lower limit to the upper at change rates of at least 60C per minute. The temperature is dwelled for at least 10 minutes at each limit before the cycle continues, and the temperature is ramped from the upper limit down to the lower limit, again with a change rate of at least 60C per minute. Functional testing is conducted on the product to ensure the functionality throughout the entire cycle.

Five temperature cycles between the upper and lower limits are conducted, with the product being continuously monitored throughout testing. When testing electronic goods Rapid Thermal Transitions predominantly discovers failures related to timing issues.s .