I recently assemble 4 emonTX arduino shield. When I measure the current in all the devices, with the CT sensors plugged (100 A), it does not give me a zero current value of zero. The measurement is unstable, reaching values bwtween zero and 6.
What could be the problem?
0-6watts on a 100a CT is pretty good. That’s around 0.026% fluctuation.
[edit] I assume the numbers you quote are watts? you don’t specify a unit.
no, is current value (A)