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The cross capacitor of NIM established in 1970 s is the primary standard of Chinese capacitance traceability system. It has a relative uncertainty of 1 in 107. The value of the capacitor is about 0.5 pF. This small value leads to a low SNR, and the sensitivity of the measurement is about several parts in 108 . An opto-electronic isolating method is designed in this paper, cooperated with a lock-in...
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