a. Temperature. Unless otherwise specified in the test plan, if any action other than test item operation (such as opening the chamber door) results in a significant change of the test item temperature (more than 2°C (3.6°F)), re-stabilize the test item at the required temperature before continuing. If the operational check is not completed within 15 minutes, reestablish the test item temperature conditions before continuing.b. Rate of temperature change. Unless otherwise specified, control the rate of temperature change to not exceed 3°C (6°F) per minute to prevent thermal shock.c. Temperature measurement. Install temperature sensor instrumentation on or in the test item to measure temperature stabilization data (see Part One, paragraph 5.4).d. Temperature recording. Continuously record the chamber and test item temperature, if required.