Abstract：A digital compensator is designed to output regulated signal in four-quadrant and its core component is two 16-bit serial input multiplying digital-to-analog converters. With sinusoidal reference signal, the in-phase and the quadrature component of the output can be adjusted in accordance with the given code. A computer controlled current-comparator bridge is developed and magnetic potential self-balance can be got by applying the digital compensator and Newton iteration algorithm. The AC/DC relative difference of bifilar helix resistors are measured below 1592 Hz through the proposed bridge using substitution method, and the standard measurement uncertainty is 2×10-7 that can meet the requirement for quantity value dissemination of AC resistance.
王云静,王玉田,曲正伟. 数字微差补偿器及其在电流比较仪电桥中的应用[J]. 计量学报, 2015, 36(5): 530-534.
WANG Yun-jing,WANG Yu-tian,QU Zheng-wei. A Digital Compensator and Its Application in Current-comparator Bridge. Acta Metrologica Sinica, 2015, 36(5): 530-534.
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2015, Vol. 36 
