ISO 16859-2:2015
Metallic materials — Leeb hardness test — Part 2: Verification and calibration of the testing devices
ISO 16859-2:2015 specifies methods for direct and indirect verification of test instruments used for determining Leeb hardness in accordance with ISO 16859‑1, and also describes when these two types of verification are to be performed.
The direct verification involves checking that individual instrument performance parameters fall within specified limits, whereas the indirect verification utilizes hardness measurements of reference test blocks, calibrated in accordance with ISO 16859‑3, to check the overall performance of the instrument for testing in the direction of gravity. The indirect method can be used on its own for the periodic performance checking in service.
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Foreword
1 Scope
2 Normative references
3 General conditions
4 Direct verification
4.1 General
4.2 Calibration parameters
4.3 Verification of mass and geometry of impact body
4.4 Verification of geometry and hardness of indenter ball
4.5 Verification of geometry of support ring
4.6 Verification of impact velocity
4.7 Indirect verification of instrument
5 Indirect verification
5.1 General
5.2 Procedure
5.3 Variation coefficient (V)
5.4 Error of test instrument
5.5 Measurement uncertainty
6 Intervals between verifications
7 Verification report/calibration certificate
Annex A (informative) Measurement uncertainty of calibration results of Leeb hardness testing instrument
Annex B (informative) Direct verification of single coil instrument
Bibliography
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Foreword
1 Scope
2 Normative references
3 General conditions
4 Direct verification
4.1 General
4.2 Calibration parameters
4.3 Verification of mass and geometry of impact body
4.4 Verification of geometry and hardness of indenter ball
4.5 Verification of geometry of support ring
4.6 Verification of impact velocity
4.7 Indirect verification of instrument
5 Indirect verification
5.1 General
5.2 Procedure
5.3 Variation coefficient (V)
5.4 Error of test instrument
5.5 Measurement uncertainty
6 Intervals between verifications
7 Verification report/calibration certificate
Annex A (informative) Measurement uncertainty of calibration results of Leeb hardness testing instrument
Annex B (informative) Direct verification of single coil instrument
Bibliography