ISO 4545-2:2017
Metallic materials — Knoop hardness test — Part 2: Verification and calibration of testing machines
ISO 4545-2:2017 specifies the method of verification and calibration of testing machines for determining Knoop hardness for metallic materials in accordance with ISO 4545‑1.
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 to be used for other methods of hardness testing, it will be verified independently for each method.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 General conditions
5 Direct verification
5.1 General
5.2 Calibration of the test force
5.3 Verification of the indenter
5.4 Calibration and verification of the diagonal measuring system
5.5 Verification of the testing cycle
5.6 Uncertainty of calibration/verification
6 Indirect verification
6.1 General
6.2 Test force and hardness levels
6.3 Measurement of reference indentations
6.4 Number of indentations
6.5 Verification result
6.6 Repeatability
6.7 Bias
6.8 Uncertainty of calibration/verification
7 Intervals between verifications
8 Verification report/calibration certificate
8.1 Knoop testing machine
8.2 Knoop indenter
Annex A (informative) Uncertainty of the calibration results of the hardness testing system
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 General conditions
5 Direct verification
5.1 General
5.2 Calibration of the test force
5.3 Verification of the indenter
5.4 Calibration and verification of the diagonal measuring system
5.5 Verification of the testing cycle
5.6 Uncertainty of calibration/verification
6 Indirect verification
6.1 General
6.2 Test force and hardness levels
6.3 Measurement of reference indentations
6.4 Number of indentations
6.5 Verification result
6.6 Repeatability
6.7 Bias
6.8 Uncertainty of calibration/verification
7 Intervals between verifications
8 Verification report/calibration certificate
8.1 Knoop testing machine
8.2 Knoop indenter
Annex A (informative) Uncertainty of the calibration results of the hardness testing system
Bibliography