Infrared for circuit check-out

All objects with temperatures above absolute zero emit electromagnetic radiation, most of which falls in the infrared region of 0.1 to 100 microns. An energized resistive circuit is a source of thermal infrared radiation because its power is dissipated as heat. Consequently, any change in the normal temperature of circuit components or over-all infrared pattern should indicate changes in circuit operating conditions. A new method of fault isolation and prediction is described that relates these infrared changes to the circuitry