DDS298 meter applies to the working conditions of power electricity metering of 50Hz or 60Hz frequencieys, the 10~+50 environmental temperature and the humidity not more than 85%. This electric meter adopts micro-electronic technology to meter the power.It gets the voltage sampling signals from the voltage divider and gets the current signals from the current divider,then gets the current & voltage signals from the multiplier and through frequency conversion produce a counting pulse in which the frequency is in direct ratio with the voltage current.Then the counter is driven by frequency dividing stepping motor to meter the power. 220V 1.5(6)A,2.5(10)A,5(20)A,10(40)A,15(60)A,20(80)A 240V 300V 5(30)A,10(60)A