AMPP Cathodic Protection Technician CP2 Practice Exam 2025 – Complete Test Prep

Question: 1 / 675

What impedance level is preferred for the internal circuit of a meter in cathodic protection?

Low

High

In cathodic protection, a high impedance level is preferred for the internal circuit of a meter because it minimizes the amount of current drawn from the system being tested. When a meter has high impedance, it does not significantly affect the existing electrical conditions of the cathodic protection system. This is crucial for ensuring that accurate measurements are taken without distorting the potential or current flowing within the cathodic protection system.

If the meter had low impedance, it would draw more current, potentially leading to incorrect readings by altering the conditions it is meant to measure. A low impedance also risks overloading the circuit or affecting the operation of the protection system itself. High impedance allows for a more precise evaluation of the potential and effectiveness of cathodic protection installations by ensuring that the meter operates as a passive observer in the system.

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Medium

Variable

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