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BS EN ISO 6789-2:2017 Assembly tools for screws and nuts. Hand torque tools - Requirements for calibration and determination of measurement uncertainty, 2017
- 64_e_stf.pdf [Go to Page]
- European foreword
- Endorsement notice
- 30314971-VOR.pdf [Go to Page]
- 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 [Go to Page]