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Instrument operation is simple and easy to use, measure process controlled by micro-computer capable of measuring current, resistive current of MOA and its harmonic reference voltage, power frequency and its harmonics, reactive power and phase difference, large-screen display voltage and current waveforms. Instruments digital waveform analysis, harmonic analysis and digital filtering software anti-jamming methods enable accurate and stable measurement results can be accurately analyzed the fundamental and 3~7 content of harmonics, and overcome interference, right side measuring resistive current of MOA.