An eddy current system (60-cycle comparator type) will measure variations caused by differences in:

An eddy current system, particularly one that operates on the 60-cycle comparator principle, is designed to detect variations in conductive materials based on their physical and chemical properties. It accomplishes this by measuring changes in the amplitude and phase of the eddy currents induced in the material.

Differences in size or shape can affect the path and distribution of eddy currents. When a component has variations in geometry, it alters how the electrical fields interact with the material, thereby influencing the detected signal.

The grade or chemistry of the material also plays a crucial role. Variations in the alloy composition or the presence of impurities will impact the electrical conductivity and permeability of the material. These changes will similarly reflect in the eddy current response.

Moreover, how the material has been processed—such as through welding, heat treatment, or manufacturing techniques—can lead to differences in microstructure that affect conductivity and magnetic properties. Any alteration in these processing conditions can influence the eddy current measurement.

Since each of these factors—size or shape, material grade or chemistry, and processing conditions—can introduce variations that the eddy current system can detect, it is accurate to state that the system measures variations caused by all of the above influences. This comprehensive approach of detecting changes allows