Thanks James Evans for reply. Voltage under consideration : 80V to 600V Current under consideration : 10mA to 90A Currently i have made it with 1600 impulse output. But it is not possible to check its accuracy. Plz consider below calculation : Running load : 1KWh = 1000 Watt hour -> Pulse output : 1600 pulse/hour Running load : 1 Watt hour -> Pulse output : (1600/1000) pulse/hour At 100mA Current, 240V Running load : 24 Watt hour -> Pulse output : (1600/1000)*24 pulse/hour = 38.4 Pulse/Hour If i get 39 pulse : Error = (39/38.4)*100 = 101.5625-100 = 1.5 % ; Calculations are done theoretically, however it is clear we cant receive exactly 38.4 pulse practically for exact in one hour. Similarly consider for 6400 impulse/kwh : Running load : 1KWh = 1000 Watt hour -> Pulse output : 6400 pulse/hour Running load : 1 Watt hour -> Pulse output : (6400/1000) pulse/hour = 6.4 Pulse/hour At 100mA Current, 240V Running load : 24 Watt hour -> Pulse output : 6.4*24 pulse/hour = 153.6 Pulse/Hour If i get 154 Pulse : Error = ((154/153.6)*100)-100 = 100.26-100 = 0.26 % ; Still not under 0.1%. At higher currents it will not be any problem. But to check error % at low currents we require higher pulse output. That is why in reference meters, they provide pulse output in TTL level (as LED cant support at such higher frequency) with constants in more than 10 Million. We too want to provide same. So for this purpose please suggest any IC/Chip that can provide pulse output in TTL level with constant more than 10 Million. Thanks in Advance.
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