研究目的
To describe a calibration system for AC shunts using digital sampling, providing both ratio errors and phase displacements of a shunt under test with respect to a reference shunt.
研究成果
A calibration of AC shunts at frequencies up to 10 kHz using digital sampling is described. The calibration system operates at test currents of up to 10 A at 10 kHz. Its performance has been evaluated using current comparator measurement techniques combined with coaxial AC bridge measurement techniques. The expanded measurement uncertainties (k = 2) of the calibration are estimated to be better than 30 μA/A for magnitude and 30 μrad for phase at 10 kHz, and less at lower frequencies.
研究不足
The current capability in the described implementation of the calibration system is imposed by the transconductance amplifier output current at high frequencies. The main resistance ratios of shunts under test with respect to a reference shunt are 1:1 and 10:1.
1：Experimental Design and Method Selection:
The calibration system uses digital sampling to measure ratio errors and phase displacements of AC shunts. It includes a signal generator, transconductance amplifier, isolation transformer, and digital samplers.
2：Sample Selection and Data Sources:
The system tests AC shunts with a reference shunt, using voltages V1 and V2 referenced to ground.
3：List of Experimental Equipment and Materials:
Includes signal generator (SG), transconductance amplifier (T), isolation transformer (IT), digital samplers (DS1, DS2), high-frequency buffer-amplifiers (A1, A2), and impedances (Z1, Z2).
4：2). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Synchronous sampling is initiated by a computer, which controls the signal generator, collects data from the samplers, and processes it.
5：Data Analysis Methods:
Uses digital bandpass filters to suppress harmonic remnants and calculates the ratio and phase displacement of the shunts.
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