关键词: 量子基准, 量子化霍尔效应, 四端对, 交流电桥, 交流电阻

Abstract: AC resistance usually shows AC-DC difference of frequency response in ac current flow. And then calibration and tracing the value of ac resistor is a hard work in metrology area. Operator can trace the ac resistor’s value with calculable resistor of AC-DC difference. But the stability and coherence of the calculable resistor of AC-DC difference are in poor condition. In further step, AC quantum hall resistance standard work well as a new ac resistance value tracing method, in condition making good state of ac quantum hall effect reduplication and tracing precision to ac resistance standard.In this paper we introduce a split shield method of quantum hall resistance for avoiding frequency response. Also a high precision at nE-8 degree tracing method is introduced with 4 terminal pair ac bridge，together with high precision 4 terminal pair ac bridge calibration method with equal potential shield. The application area of ac quantum hall resistance standard is introduced.

Key words: Quantum standard , Quantum hall effect , 4 terminal pair, Ac bridge , Ac resistance