管道断电电位测量

    影响管地电位的所有电源要同步通
    测量管道断电电位时，所有影响该点管地电位的电源都要同步通断，尤其是那些输出电流比较大、影响范围比较广的恒电位仪通常的做法是将与GPS同步的电流通断器串联在阴极保护电源阴极或阳极回路中，在断电瞬间，尤其在靠近阴极保护站位置，管地电位有时会有一个正向脉冲。为避免管地电位脉冲对断电电位测量值的影响，断电电位应在断电后0.3~0.5s内读取，若用万用表读取管道断电电位，则很难发现该脉冲。

All power supplies affecting the pipe ground potential shall be connected synchronously
When measuring the pipeline power-off potential, all power supplies that affect the pipeline ground potential at this point shall be switched on and off synchronously, especially those potentiostats with large output current and wide influence range. The common practice is to connect the current switch synchronized with GPS in the cathode or anode circuit of the cathodic protection power supply. At the moment of power-off, especially near the cathodic protection station, the pipeline ground potential sometimes has a positive pulse. In order to avoid the impact of the pipeline ground potential pulse on the measured value of the power-off potential, the power-off potential should be read within 0.3 ~ 0.5s after the power-off. If the pipeline power-off potential is read with a multimeter, it is difficult to find the pulse.