An apparatus includes a processor configured to control an automatic test equipment (ATE) to measure one or more parameters of a current test instance for testing a device under test (DUT), during execution of the current test instance on the DUT, and determine, based on the measured one or more parameters, one or more controls for controlling a temperature of a thermal head connected to the DUT so that a junction temperature of the DUT corresponds to a predetermined test temperature. The processor is further configured to control the temperature of the thermal head, based on the determined one or more controls.