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The high-voltage DC measuring system based on bandgap voltage references has been used for high accuracy with low dynamic resistance up to 20 kV. The measuring system is stable output over a wide range of operating current and ambient temperature, and it is insensitive to effects due to leakage currents. One of the most important parameters of a reference system is its long-term stability. This paper...
A key comparison of the AC-DC current transfer difference has been carried out by the Inter-American Metrology System (SIM) Regional Metrology Organization (RMO). Its purpose was to establish an equivalence of AC-DC current transfer difference at 10 mA and 5 A between the national metrology institutes (NMIs), in support of the International Committee for Weights and Measures (CIPM) Mutual Recognition...
We describe a method to identify and correct slowly decaying transients in electrical measurements which are performed with periodic reversal of current or voltage bias. Such transients may be of different physical origin like, e.g., dielectric absorption in insulators, which often exhibit a 1/t time dependence, or the Peltier effect. We demonstrate the method with data collected in precision resistance...
A new phase comparator for current shunts with frequency range to 1 MHz has been developed and a new method to determine the absolute phase angle error of current shunts is described. Preliminary expanded uncertainty of the absolute phase angle error for a reference shunt with resistance 1,5 Ω is ±200 μrad at 1 MHz. Based on the reference shunt the phase comparator is used to determine the phase angle...
A system for the calibration of wideband wattmeters used in the measurement of standby electrical power in accordance with IEC 62301 has been developed at the National Measurement Institute, Australia (NMIA). The system has been tested with current waveforms having crest factors up to 20 and has uncertainties significantly lower than those required by the standard.
Precision DC voltage dividers with ratings up to 1000 kV have been built using the 150 kV resistor module developed at the National Measurement Institute, Australia (NMIA). The structure of the 150 kV resistor module and the measurement techniques for evaluating its performance are described. The method for evaluating voltage ratio errors at voltages up to 1000 kV is discussed. It is shown that a...
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