Abstract:In order to optimize the design of two dimensional servo valve and improve test accuracy and efficiency, a measurement and control system for two dimensional servo valve was developed with virtual instrument and high speed data acquisition, which had parameters setting, data acquisition, data storage and analysis functions. Through the test of two dimensional servo valve with size 10, the results show that test system can realize the static and dynamic characteristics and frequency response tests under different working conditions; the static characteristic shows that the axial displacement of the valve spool is linear with the flow rate, and the hysteresis is very small; when the system pressure goes up to 14 MPa, the rising and the descent times are 9 and 7 ms respectively under step response; when volume of sensitive cavity is doubled and the system pressure is set to 13 MPa, the selfexcited oscillation and screaming of the valve occur, and the fundamental frequency of the signal is about 1 300 Hz.