INTERNATIONAL STANDARD ISO 4545-2
Metallic materials — Knoop hardness test —
Part 2:
Verification and calibration of testing machines
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
替代情况：替代 ISO 4545-2：2005
Contents
Foreword
1. Scope
2. Normative references
3. Terms and definitions
4. General conditions
5. Direct verification
6. Indirect verification
7. Intervals between verifications
8. Verification report/calibration certificate
Annex A (informative) Uncertainty of measurement of the calibration results of the hardness testing system
Bibliography
1 Scope
This document specifies the method ofverification and calibration oftesting 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.
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 -3 , Metallic materials — Knoop hardness test — Part 3 : Calibration of reference blocks
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 https://www.iso.org/obp
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