Metallic materials. Knoop hardness test - Verification and calibration of testing machines included-in-kit water flow and water level

water flow and water level sensing controls for swimming pool pumps

This part of ISO 11140 does not consider the performance of the standard test pack

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

it has a more modern appearance

Annex A (normative) Materials and

Metallic materials. Knoop hardness test - Verification and calibration of testing machines included-in-kit water flow and water level1 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