Product Introduction this instrument is specially used to test power grid waveform distortion voltage fluctuation and flicker harmonic content and unbalanced three-phase power quality problems such as high precision testing instruments; at the same time it also have the the functions of electric parameter test the vector analysis. Product Characteristics Can accurately measure voltage current active power reactive power frequency phase Angle power factor and other electrical parameters It can display the measured voltage and current phasor diagram the users can know the device wiring correctly or not through the analysis of vector diagram . The current is measured by using the clamp transformer.Because using clamp current transformer measurementthe operators do not need to disconnect current loop can be measured convenient and safety. It can be equipped with different range of clamps according to the user's measurement range. It can measure and analysis the power quality from the utility grid to the client's use its measure and analysis frequency deviation voltage deviation voltage fluctuation and flicker unbalanced three-phase voltage allowed degrees and power grid harmonic. Can display the single phase voltage and current waveform and can also show three phase voltage and current waveform. All tests have screen lock function interface to facilitate users to reading and analyze the data.