Metallic materials. Knoop hardness test - Verification and calibration of testing machines included-in-kit Retroactive exclusion from analysis

Retroactive exclusion from analysis

and at a distance of three times the case-hardened depth from the surface

water flow and water level sensing controls for swimming pool pumps

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Metallic materials. Knoop hardness test - Verification and calibration of testing machines included-in-kit Retroactive exclusion from analysis1 Scope This document specifies the method of verification and calibration of testing machines for determining Knoop hardness for metallic materials in accordance with ISO 45451. A direct method of verification and calibration is specified for the testing machine, indenter, and the diagonal length measuring system. An indirect verification method using reference blocks is specified for the overall checking of the machine. If a testing machine is also