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The paper analyzed voltage variation generation mechanism of DC high voltage divider advances high voltage divider variation measurement method---serial and parallel voltage double-method, verifies the establishment condition of series and parallel double-voltage method in theory, measures the voltage variation of DC high voltage divider through experiment, the measurement uncertainty is better than 10-6.

The stability of the high voltage arm resistors has a strong influence on the performance of the resistance high DC voltage divider. So by analyzing the main parameters that affect the resistor value change, including voltage coefficient, power coefficient and so on, a new matching method is proposed to make a high precision high DC voltage divider in this paper. Based on the principle of pairing the resistors and adjusting the big and small ones, a high precision high DC voltage divider could be made with the voltage variation less than 0.005%, even on the condition of using high voltage coefficient and power coefficient resistors.

This paper researches DC high voltage ratios measurement method, which based on two-digital meters with external synchronous trigger mode. Through experiment, the measurement method can overcome the effect of high voltage power supply ripple and drift. The type A uncertainty of this method could decrease more than 10-100 times.