ASTM B244, ISO 2360, DIN 50984

Used to measure:

• Electrically non-conductive coatings on non-ferrous metals such as paint, powder coatings, plastics on aluminum, brass, or zinc and anodized coatings on aluminum;
• Poorly conductive non-ferrous coatings on electrically good conducting non-ferrous metals such as chromium or electroless nickel on copper, aluminum, or brass.

Test Method Basics

Contacting test method. A high-frequency magnetic field induces Eddy currents in the conductive substrate material. The magnitude of these Eddy currents depends on the distance between the probe coil and the substrate material. The measurement signal is derived from the reflected impedance change in the probe coil as a function of the Eddy currents generated in the substrate material.