The paper describes a computer-based data sampling and controlling system for UV experiments. The system is composed of chips such as 8031, 8279, 8255, ADC0809, 2764, and 6264, a thermosensitive electric resistor, and sensors for UV and global radiation. This system works automatically to observe temperature, UV radiation, and global radiation, to turn on/off the supplementary UV lamps, and to print out results of measurements.