INTERNATIONAL STANDARD ISO 4545-3
Metallic materials — Knoop hardness test —
Part 3:
Calibration of reference blocks
ISO 4545 consists of the following parts, under the general title Metallic materials —— Knoop hardness test:
ISO 4545-1:2017, Metallic materials — Knoop hardness test — Part 1: Test method
ISO 4545-2, Metallic materials — Knoop hardness test — Part 2: Verification and calibration of testing machines
ISO 4545-3:2017, Metallic materials — Knoop hardness test — Part 3: Calibration of reference blocks
ISO 4545-4, Metallic materials — Knoop hardness test — Part 4: Table of hardness values
替代情況：替代 ISO 4545-3：2005
Contents
Foreword
1. Scope
2 Normative references
3 Terms and definitions
4 Manufacture of the reference block
5 Calibration machine
6 Calibration procedure
7 Number of indentations
8 Uniformity of hardness
9 Marking
10 Calibration certificate
11 Validity
Annex A (informative) Adjustment of Kohler illumination systems
Annex B (informative) Uncertainty of measurement of hardness-reference blocks
Bibliography
1 Scope
This document specifies the method for the calibration of reference blocks to be used for the indirect verification ofKnoop hardness testing machines as specified in ISO 4545-2 .
The method is applicable only for indentations with long diagonals ≥0,020 mm.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition ofthe referenced document (including any amendments) applies.
ISO 376:2011, Metallic materials — Calibration of force-proving instruments used for the verification of uniaxial testing machines
ISO 4545-1, Metallic materials — Knoop hardness test — Part 1: Test method
ISO 4545-2 , Metallic materials — Knoop hardness test — Part 2: Verification and calibration of testing machines
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
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