ESATEST® Principle is an ERNST patent based on the two-way relationship between penetration and change in residual electrical resistance, where the diamond indenter is made electrically semi-conductive
e-handy and MTR-X are ACCREDIA certified and operate according to the ESATEST® method, based on the variation of electrical resistance. The diamond, through the CVD process (Chemical Vapor Deposition), is made electrically semi-conductive. The principle allows determination of the hardness value in difficult places or points that are physically inaccessible to conventional hardness testers, such as interiors, cavities, grafts, welds and gear teeth. Results are converted and displayed in real time in Brinell, Vickers and Rockwell scales. The use of limited forces avoids damage to finished parts, allowing measurement even on sliding surfaces.
Highest electrical resistance is measured when the indenter touches the surface to be tested, while it decreases as it penetrates in it. The variation in resistance indicates how far the indenter is penetrated into the metal being measured; if the latter has low hardness value, penetration will be greater with a lower measured resistance, while if the material is harder, less penetration will occur with a higher resistance detected.