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| A Digital Compensator and Its Application in Current-comparator Bridge |
| WANG Yun-jing,WANG Yu-tian,QU Zheng-wei |
| School of Electrical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China |
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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.
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| Fund:国家自然科学基金（51107109）; 河北省自然科学基金（E2013203195） |
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2015, Vol. 36 
