... active/reactive energy measurement.4. Automatic voltage and current range selection.5. Three phases voltage, current, phase, frequency, active, ... RS232 COM, control and read electrical parameter through RS232.Index:1.Accuracy: 0.05.2.Voltage ranges: 60V, 100V, 200V ... pulse output frequency: 30kHz (high frequency), 3Hz (low frequency), TTL electrical level: 5V.6.Dimension: 340mmX380mmX140mm(L X W ...