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How is the cathodic protection potentiostat to have voltage only to have no current to return a responsibility

The following three points

1, anode does not work, 2; There is no load, or the line is broken,

2. Obviously there is no enough loop, check the electrode, if the electrode is accurate, the medium can not pass, if it is the ship should be in the fresh water area, if it is on land, it is too dry soil.

3. According to what you said, the potentiostat itself has output, but there is no output in the whole circuit. Recommended measures: 1. Check whether the ammeter head connection in the potentiostat is loose? 2. Check the wiring of cathode and anode to confirm whether the cathode and anode are open.