... AC voltage,current,phase,frequency,phase sequence,power 2.RS232 ETCR 4000A Double Clamp /Three Phase Digital Phase ... 0.00 V~600V, Active Power: 0.0W~12kW, with RS232 interface to download data, Date Storage: 1500 sets. .Technical ... keep data, " DH " symbol appearsData Storage1500 setsRS232 InterfaceUSB-RS232 interface, download data to computer for analysis and managementAutomatic ShutdownAutomatic ...