Producing Reason and Compensation Method of the Differential Transformer Residual Voltage at Zero Point
Qian Li · Electronic Components and Materials · 2006
The structure and output quality of differential transformer sensor were introduced simply. The producing reason of residual voltage at zero point and its affection to the nonlinear quality and sensitivity of measurement system were analyzed extensively. A compensation circuit was proposed and then experiments were made. The experimental results show that the residual voltage is decreased form 65.6 mV to 15.6 mV, the sensitivity of system is increased from 1 360.39×10–3 V/mm to 1 386.69×10–3 V/mm, the nonlinear error is decreased from 2.04% to 0.49%. So the compensation circuit designed is simple and effective and desirable effect is obtained.