The functional features of the device include: high-precision electricity measurement and energy measurement; three-phase voltage/current imbalance analysis and harmonic distortion rate analysis; three-phase voltage/current total harmonics and 2nd to 31st sub-harmonic analysis ;Supports 4 channels of DI, 2 channels of DO and 1 channel of contact pulse output; supports time-of-use billing, demand and maximum value records, and fixed value exceeding limits; supports 32 SOE event records; 1 RS-485 communication port.