What does "sensitivity" refer to in Eddy Current Testing?

In Eddy Current Testing, sensitivity specifically refers to the ability of the testing equipment to detect small defects within the material being examined. This characteristic is crucial because it determines how effectively the inspector can identify flaws, anomalies, or variations in conductivity within a conductive material. High sensitivity allows for the detection of tightly grouped or subtle discontinuities that might otherwise go unnoticed.

Sensitivity is influenced by several factors, including the frequency of the eddy currents utilized, the coil design, and the method of operation. However, the primary focus is on how well the system can respond to variations caused by these small defects, making it essential for thorough and effective inspections.

The other aspects mentioned in the choices relate to different characteristics of the testing process but do not address the core concept of sensitivity in the context of defect detection.