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In this paper, with an attempt to extract a purified signal from the output signal with measurement noise, a measurement noise attenuation technique is applied into the extended state observer (ESO). A first order low-pass filter is utilized to filter the high-frequency measurement noise. By doing so, ESO is able to estimate the total uncertainties more accurate, and avoids the danger of making the...
This paper proposes a DC high-voltage resistive divider circuit model, analyzes the reason that leakage current arises when applying high voltage, develops the measurement device for measuring leakage current of a divider, and puts forward a method of evaluating the divider voltage variation by measuring leakage current. The measurement uncertainty is better than 4 × 10−6.
In order to minimize the uncertainty of direct current comparator (DCC), the effect of interfering flux on DCCs is investigated here. Some important concerns are studied, such as the number of bus-bars, the window shape of bus-bars, the distance between the bus-bars and core, etc. The investigations are performed by finite element method (FEM). The results show that the bus-bars should be configured...
Two simulant high-power resistance standards were newly developed at NIM. The first resistance standard uses a high-power resistor for signal sampling, IVD for adjustment, and a voltage-follower for output. The high-power low-resistance resistor has similar input/output characteristic as the simulated variable and can carry more load power. The second resistance standard uses resistance network for...
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