... system.2. Technical parameters Technical parametersValueInputNetworkSingle-phase network; 3-phase balanced network3-phase unbalanced, 3 wires; 3-phase unbalanced, 4 wiresMeasurableIa,Ib,Ic,Ua, ... (open-collector),Pulse constant: 10000, 40000, 160000 imp/kWhPrecision0.5 (F: 0.05Hz; kVar: 1)Power supplyAC/DC 85 ... 45°C; Storage T: -20°C ~ +70°CRelative humidity: 5% ~ 95% (no condensation)Altitude: ≤2500m