... meter calibration, P3 / P4 automatic wire checking, constant checking, waveform and the harmonics analysis, demand quantity, burden test7) Standard RS232 and USB ... ) Accuracy class: 0.05, 0.12) Working voltage: AC 80 - 400V, voltage measurement: 30 - 400V3) Current measurement directly: 0 ... 500A, 1,000A are optional) 4) Measurement accuracy for voltage, current and the power: 0.05%5) Measurement ...