... stability, accuracy, long life. 1. Brief introduction DDSY3333 single phase prepaid electricity meter adopts LSI (large scale integrated circuit), ... no need to re-calibrate for long term operation. 2.2 Way of connection: direct connection, through CT, through ... (100) 110, 120, 220, 230,240 1.0S, 2.0S50, 60Starting currentOperating temperature range(°C)Relative humidityVoltage circuitCurrent circuit0 ...