Absolute measurement of low-voltage capacitor voltage coefficient by double voltage method

The voltage coefficient of low voltage capacitor is the most important fact that affects the accuracy degree of capacitance value of capacitor. Its value and feature must be measured out when it used in the high accuracy situation. This paper presents an absolute double voltage measure method that gets the absolute voltage coefficient curve from 0 V to 1000 V needs only 5-step measurement. And proposed the related compensate measures and methods against the possible problems in measure system. After compensation, the measure error is only related to the accuracy of current comparator bridge. In this paper the measurement uncertainty is about 1×10^-6 when ignore the linear fitting error.