ISO 6789-2:2017
Assembly tools for screws and nuts — Hand torque tools — Part 2: Requirements for calibration and determination of measurement uncertainty
ISO 6789-2:2017 specifies the method for the calibration of hand torque tools and describes the method of calculation of measurement uncertainties for the calibration.
ISO 6789-2:2017 specifies the minimum requirements for the calibration of the torque measurement device where the relative measurement uncertainty interval, W´md, is not already provided by a traceable calibration certificate.
ISO 6789 is applicable for the step by step (static) and continuous (quasi-static) calibration of torque measurement devices, the torque of which is defined by measuring of the elastic form change of a deformable body or a measured variable which is in proportion to the torque.
ISO 6789-2:2017 applies to hand torque tools which are classified as indicating torque tools (Type I) and setting torque tools (Type II).
NOTE Hand torque tools covered by this document are the ones identified in ISO 1703:2005 by reference numbers 6 1 00 11 0, 6 1 00 11 1 and 6 1 00 12 0, 6 1 00 12 1 and 6 1 00 14 0, 6 1 00 15 0. ISO 1703 is currently under revision. In the next edition, torque tools will be moved to an own clause, and with this change the reference numbers will also change and additional reference numbers will be added.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols, designations and units
4 Requirements for calibration
4.1 Calibration during use
4.2 Calibration method
4.3 Calibration system
5 Measurement error
5.1 Calculation of the relative measurement error
5.2 Exemplary calculations of the relative measurement error
5.2.1 Example 1
5.2.2 Example 2
6 Sources of uncertainty
6.1 General
6.2 Evaluation of Type B uncertainties due to the torque tool
6.2.1 Scale, dial or display resolution, r
6.2.2 Variation due to the reproducibility of the torque tool, brep
6.2.3 Variation due to the interface between the torque tool and the calibration system
6.2.4 Variation due to the variation of the force loading point, bl
6.3 Evaluation of Type A uncertainty due to the torque tool
6.3.1 General
6.3.2 Variation due to the repeatability of the torque tool, bre
7 Determination of the calibration result
7.1 Determination of the relative standard measurement uncertainty, w
7.2 Determination of the relative expanded measurement uncertainty, W
7.3 Determination of the relative measurement uncertainty interval, W’
8 Calibration certificate
Annex A (informative) Calculation example for an indicating torque tool (Type I)
Annex B (informative) Calculation example for a setting torque tool (Type II)
Annex C (normative) Minimum requirements for the calibration of the torque measurement device and the estimation of its measurement uncertainty
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols, designations and units
4 Requirements for calibration
4.1 Calibration during use
4.2 Calibration method
4.3 Calibration system
5 Measurement error
5.1 Calculation of the relative measurement error
5.2 Exemplary calculations of the relative measurement error
5.2.1 Example 1
5.2.2 Example 2
6 Sources of uncertainty
6.1 General
6.2 Evaluation of Type B uncertainties due to the torque tool
6.2.1 Scale, dial or display resolution, r
6.2.2 Variation due to the reproducibility of the torque tool, brep
6.2.3 Variation due to the interface between the torque tool and the calibration system
6.2.4 Variation due to the variation of the force loading point, bl
6.3 Evaluation of Type A uncertainty due to the torque tool
6.3.1 General
6.3.2 Variation due to the repeatability of the torque tool, bre
7 Determination of the calibration result
7.1 Determination of the relative standard measurement uncertainty, w
7.2 Determination of the relative expanded measurement uncertainty, W
7.3 Determination of the relative measurement uncertainty interval, W’
8 Calibration certificate
Annex A (informative) Calculation example for an indicating torque tool (Type I)
Annex B (informative) Calculation example for a setting torque tool (Type II)
Annex C (normative) Minimum requirements for the calibration of the torque measurement device and the estimation of its measurement uncertainty
Bibliography