It is a kind of on-line power quality monitoring device for power grid users. The power quality monitoring device can measure and analyze the power quality of public power grid under different operating conditions of various electrical equipment. And the power quality monitoring device is equipped with LCD, which can view historical data on the device at any time.

Power quality monitoring can make statistical analysis on the recorded historical data and view the record chart of each parameter. There are operation buttons on the device, which can be operated manually on the device directly. The corresponding data can be found according to the interface prompts.

In the field of staff in urgent need of a data can be called out at any time to view, convenient for staff to carry out the next step of work. The online monitoring device can view the historical data statistics, such as three-phase voltage RMS, three-phase current RMS, three-phase voltage imbalance, three-phase current imbalance, harmonic voltage content, harmonic current content, active power, reactive power, apparent power, power factor, as well as the values of frequency and flicker.