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BS 7882:2017 Method for calibration and classification of torque measuring devices, 2017
- Foreword
- 1 Scope
- 2 Terms, definitions, abbreviations and symbols
- 3 Preparation for calibration [Go to Page]
- 3.1 Reference standard
- Table 1 — Uncertainty of calibration torques
- 3.2 Condition and identification of a torque measuring device
- 3.3 Resolution of the indicator
- 3.4 Lower limit of calibration, Tmin
- 3.5 Number of calibration orientations (see Annex A)
- 4 Preliminary procedure [Go to Page]
- 4.1 Alignment
- 4.2 Temperature considerations
- 4.3 Instrumentation set-up
- 4.4 Preloading procedure
- 5 Calibration procedure [Go to Page]
- 5.1 Selection of calibration torques
- 5.2 Application of calibration torques
- 6 Calculation of results [Go to Page]
- 6.1 Determination of deflection, d
- 6.2 Determination of relative repeatability, R1
- 6.3 Determination of relative reproducibility, R2
- 6.4 Determination of relative errors of interpolation, Eit and Eitd
- 6.5 Determination of relative residual deflection, R0
- 6.6 Determination of relative reversibility, R3
- 6.7 Determination of relative errors of indication, Ei and Eid
- 6.8 Determination of uncertainty of measurement and relative measurement uncertainty interval
- 7 Classification of torque measuring devices [Go to Page]
- 7.1 General
- 7.2 Determination of a classification and its range
- Table 2 — Criteria for classification of torque measuring devices
- 8 Calibration certificate
- Annex A (informative) Orientation diagrams [Go to Page]
- Figure A.1 — Example of preloading and calibration sequences for a torque measuring device with round shaft drives, six incremental and decremental torques, classes 0.05 to 5.0
- Annex B (normative) Method example of determining uncertainty of the calibration results of the torque measuring device [Go to Page]
- Table B.1 — Summary of worked examples
- Table B.2 — Worked example in torque units: 100 N·m torque measuring device clockwise torque, incremental series only
- Table B.2 — Worked example in torque units: 100 N·m torque measuring device clockwise torque, incremental series only (continued)
- Table B.2 — Worked example in torque units: 100 N·m torque measuring device clockwise torque, incremental series only (continued)
- Table B.3 — Uncertainties calculated in accordance with B.3
- Table B.3 — Uncertainties calculated in accordance with B.3 (continued)
- Table B.4 — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series
- Table B.4 — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series (continued)
- Table B.4 — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series (continued)
- Table B.5 — Uncertainties calculated in accordance with Annex B
- Table B.5 — Uncertainties calculated in accordance with Annex B (continued)
- Table B.6 — Uncertainty interval calculated in accordance with Annex B
- Table B.6 — Uncertainty interval calculated in accordance with Annex B (continued)
- Table B.7 — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental and decremental series
- Table B.7 — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series and decremental series (continued)
- Table B.7 — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series and decremental series (continued)
- Table B.8 — Uncertainties calculated in accordance with Annex B
- Table B.8 — Uncertainties calculated in accordance with Annex B (continued)
- Table B.9 — Uncertainty interval calculated in accordance with Annex B
- Table B.9 — Uncertainty interval calculated in accordance with Annex B (continued)
- Bibliography [Go to Page]
