Concepts of some electric parameters such as frequency, duty cycle, current density and finalvoltage were introduced and the relation between duty cycle and current density was deduced.
The final inspection of the coating, before the pipe is put into trench, being carried out by a holiday detector which applies a high voltage current across the coating.
在管子放入管沟前，利用覆盖层检查仪对管道覆盖层进行最后的检查，它在覆盖层的两侧施加高压电。
3
This power supply has different regulator controls for the two 12V voltage paths, but it is still at the beta stage, so we will repeat the test for the final version.