Design and Implementation of High Accuracy Current Measurement Circuit Based on Resistance Sampling Method

Aiming at the requirement of high accuracy measurement of the output current of the gyro in the field of aerospace, military and scientific research. The principle of current measurement and theories of error compensation are studied in this paper. Then a high accuracy current measurement circuit based on the analysis is designed and implemented in this paper. After the error compensation the measurement accuracy of the system is 1.5*10-4 amps when the area of the measurement is ± 0.5 amps. Consequently, this system could provide dynamic high-accuracy measurement of current. The system could be a helpful reference for accuracy current measurement in industrial automation.