For limit frequency equations to be effective, they must be:

Limit frequency equations are critical in nondestructive testing, particularly in applications involving electromagnetic testing methods, as they help to establish the thresholds for effective inspection. These equations must be used alongside their corresponding impedance diagrams to ensure accurate interpretation of the data.

When limit frequency equations are paired with impedance diagrams, they provide a comprehensive understanding of the behavior of the material being tested and the interaction between the electromagnetic fields and material properties. Impedance diagrams visually depict how the impedance of a material changes with frequency, and when used together with limit frequency equations, they can identify defects, assess material condition, and optimize testing parameters.

Without the visual context and additional information provided by impedance diagrams, limit frequency equations can become abstract and challenging to apply effectively. Thus, the integration of both tools enables the technician to confirm findings, manage uncertainties in the material response, and enhance the reliability of the inspection process.