... volt,amp,watt,var,va,Hz, cosf,kwh,kvarh, harmonics,Unbalance rate, demand 2. RS485/Modbus, Profibus PMAC770 Multifunction Power Meter with Following ... .0%THD1.0%Harmonic1.0%Unbalance rate1.0% multifunction power meter PMAC770 Multifunction Power ...