In order to realize the automatic calibration to the displacement measurement devices

a kind of LVDT simulator based on the D/A converter and the LVDT working principle is introduced.The sine waves signals of LVDT primary coil are selected as reference voltages

using multiplication of the reference voltage and the given digital values

through changing the D/A digital value

the LVDT secondary coil output voltoge with variable amplitude is got

thus the changing of LVDT secondary coil output signals following with the movement of the core are simulated.Experiment results show that static precision of the simulator is less than 0.024 % and dyamic bandwidth of 200 Hz

It can simulates LVDT electrical behavior realistically

meet requirement of maintenance and calibration of LVDT displacement measurement devices.Comparing with the real LVDT

the move machine of high precision can be left by using the simulate device

and more flexible is provided

also the automation of calibration can be realized.