To minimize the impact of thickness variations on conductivity readings, what should be done?

To minimize the impact of thickness variations on conductivity readings in Eddy Current Testing, increasing the test frequency is an effective approach. Higher frequencies allow for more focused current flow, which results in a shallower penetration depth into the material. This is particularly useful when dealing with variations in thickness, as the Eddy currents will be less sensitive to changes in thickness when the frequency is increased. As a result, this allows for more stable and reliable conductivity readings that are less influenced by thickness discrepancies, enabling better material characterization.

When using lower frequencies, the penetration depth of the Eddy currents is greater, making it more likely for thickness variations to affect the readings. Therefore, an increase in frequency is a key method to enhance measurement accuracy regarding conductivity in the presence of varying material thickness.