Power Calibration is Getting Much Easier

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Power Calibration is Getting Much Easier (1.73 MB(兆))

Direct Digital Synthesis of the voltage and current waveforms used for wattmeter calibration has made the task of controlling the phase relationship between them much simpler. The techniques developed in the 5500A and 5520A Multi- Product Calibrators can be extended to improve uncertainties and to three phase systems. This application note outlines the evolution of this technology and explains how it can be extended to improve power calibration accuracy, even in three-phase applications.