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A voltage instrument transformer (VIT) or a voltage divider is needed if a National Instruments PXI 4461 Dynamic Signal Analyzer is used in a digital sampling wattmeter application. They assure that the input voltage is lowered to the allowed level of the acquisition card, and VIT also gives the galvanic isolation. This paper discusses possible types of sectionalized windings of a VIT with primary...
We developed a magnetic flux measurement system which is based on the binary Josephson system two years ago. After that, we continue researching on the improvement of magnetic flux measurement and start to focus on the precision measurement of the mutual inductance with the flux measurement system we built before. This paper introduces the mutual inductance measurement method which is based on the...
A standard-square-wave compensation method has been proposed to measure the dc value of mutual inductance precisely in Joule Balance. A set of analog switches are used to generate excitation and compensation waves. Here error from these non-ideal switches is analyzed and evaluated theoretically with a circuit model and experimentally by comparing its difference with a DAC signal generation in the...
The inductance sensor is often used for the measurement of displacement, pressure because of its simple structure, reliability and high precision. Usually the inductance sensor adopts AC electric bridge as its converting circuit to turn the sensor's inductance into an AC voltage signal. So it is difficult to make digital processing directly for the user. This paper introduces a converting circuit...
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...
This paper presents results of experiments quantifying two systematic errors associated with the calibrations by use of an AC Josephson Voltage Standard: the change in the voltage leads error with the change in the level of probe immersion in the liquid helium, and the effect of the internal inductance of a Josephson array. The measurements were performed at frequencies 100 kHz and above, however,...
This paper describes the development of Inductive Voltage Divider (IVD) with the ratio of 8∶1 by means of the combination of three binary IVDs. The self-calibration method of the ratio error and phase error of the binary IVD was reported. We also report the determination of the phase error of a 8∶1 IVD which has relative higher input impedance by comparing with the known phase error self-calibrated...
This paper describes the calibration of Rogowski coils with an integrator for current measurement in the current range of up to 30 kA, at mains frequency. A current loop of ten turns with a current of 3 kA was used for calibration. The magnetic field generated in this way differs from the field of one turn placed at the center and passed with a current of 30 kA. The influence of the unevenness of...
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