Development of the digital sampling power measuring standard for the Energy monitors calibration

This paper describes an open source software 1-phase digital sampling wattmeter based on the sampling card National Instruments 5922 and a set of voltage and current transducers with measurement ranges from 10 mA up to 20 A and from 12 V up to 560 V with ability to measure amplitude and phase of harmonics up to 10 kHz.