... ,Unbalance rate, demand 2. RS485/Modbus, Profibus PMAC770 Multifunction Power Meter with Following Features ØSuit for LV/ HV voltage ... of time in 24 hours, 4 tariff rates. ØPower quality analysis Harmonic analysis, crest and K factor, unbalance ... Power factor0.5%Frequency0.01Active power0.5%Reactive power2.0%THD1.0%Harmonic1.0%Unbalance rate1.0% multifunction power meter PMAC770 Multifunction Power ...