Cathodic Protection Training Course
The field work for this section is to replicate the bench experiments at the test post with which you are now familiar.
Your should be now have the 'feel' of what is going on and be able to use your meter to 'see' the electrical effects.
By connecting a crocodile clip to the stud on the test post (that is connected to the pipeline) you will be able to make a steel coupon represent a coating fault. It is convenient to us a 1" broad, wood chisel as a coupon as this is easily stuck in the ground and can the depth can be readily adjusted to give an assortment of metal to electrolyte areas of contact.
You can then use the meter probes to plot the depression caused in the ground potential profile around the chisel.
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