... 1.General:DTS480 type is the 3 phase 4 wires meter which can meas the rated frequency (50HZ) electric energy ... . The meter is for indoor use,and the temperature should be -10°C to +50°C;relative humidity should be ... .0,if the current will be 0.5%,,the meter will run continuously from left-right.c.creepingWhen there ... will be 80%-100% of the rated volt,the meter's runing should not be more than 1 circle3. ...