This article builds automatic testing system based on virtual instruments, which used to test Air data computer (ADC for short). Then how to use net control and measure technology in testing system is studied in the article. What the article studies in net control and measuring can be used on testing system of other equipments on aircraft.ADC supplies data source to airplane. It is one of the most important equipments on the aircraft. The article studies structure and principle of ADC. Then principle of cal...