319. If it is desired to perform a thermographic analysis of a piece of equipment with a suspected possible fault and compare the thermal signature with similar fault-free equipment, what is the name of the thermography performed?

Comparative thermography is the correct answer; it involves comparing the thermal signature of suspect equipment to that of similar, fault-free equipment under identical conditions. Baseline thermography establishes a reference image for future comparison of the same equipment. Thermal trending monitors equipment over time. Spectral thermography utilizes different infrared wavelengths.