Hi guys,I'm getting a 0.00 reading at the mains for loop impedance and fairly low readings on the circuits.My r1+r2 is higher that all the loop readings on each circuit.This has never happened to me before.Can someone explain why?
What sort of meter are you using - a digital reading of 0.00 just means 'less than 0.01', or PSSC of >23kA which is high, but maybe not impossible, (how close is the substation ?) and look in the booklet that came with the meter quite often the accuracy is not as good as the precision. (so 0.01 +/- 3 digits in the last place or something) That is created by subtracting the lead nulling measurement, so equally a good clean and polish of the meter leads and the sockets on the meter that they plug into, followed by a re-nulling may be in order. Can you borrow another meter and cables to check against?
What sort of meter are you using - a digital reading of 0.00 just means 'less than 0.01', or PSSC of >23kA which is high, but maybe not impossible, (how close is the substation ?) and look in the booklet that came with the meter quite often the accuracy is not as good as the precision. (so 0.01 +/- 3 digits in the last place or something) That is created by subtracting the lead nulling measurement, so equally a good clean and polish of the meter leads and the sockets on the meter that they plug into, followed by a re-nulling may be in order. Can you borrow another meter and cables to check against?
