... LCD,measuring volt,amp,watt,var,va,Hz, cosf,kwh,kvarh, harmonics,Unbalance rate, demand 2. RS485/Modbus, Profibus PMAC770 Multifunction Power Meter ... , 4 tariff rates. ØPower quality analysis Harmonic analysis, ... Power factor0.5%Frequency0.01Active power0.5%Reactive power2.0%THD1.0%Harmonic1.0%Unbalance rate1.0% multifunction power meter PMAC770 Multifunction Power Meter / Panel Meter / Energy Meter ...