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When measuring the potential, the reference electrode should be placed on the soil directly above the pipeline and should be in good contact with the soil. If the soil is dry or cement pavement, it is necessary to water the reference electrode, so that the measured data will be accurate.

The decrease of ir is due to the existence of resistance in soil. When testing the potential, soil also belongs to the circuit loop of the test. Because the measurement error caused by soil resistance is ir drop, in order to obtain the most accurate cathodic protection effect of pipeline, it is necessary to eliminate ir drop, that is, power-off potential, also known as polarization potential. -850 is polarization potential, also called protection potential, but it is not tube ground potential, which is a general term for all potentials. Because the sacrificial anode system will not be over-protected, the power-off potential can reach 850.

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