This paper describes the principles of supporting Electro-Optical equipment, and three types of Test Systems used for factory and field testing of FLIR and Multi-Sensor systems. The tests performed by one of these systems are: FOV, Focusing, Boresight various L.O.S., MRTD, NEI, Laser Power level, Laser Mapping and ATR. I will emphasize special considerations implemented for optical performance in field conditions, and for enhanced automation and realism of the test process. (Dynamic MRT, and Scene Simulation capabilities). The paper will describe a system for testing a sensor with TV, NIR, FLIR and laser designators-targeting rangers.