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BS 7996:2018 - TC Tracked Changes. Torque measuring devices. Calibration and classification using continual torque application. Method, 2020
- 30342603_New.pdf [Go to Page]
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms, definitions, abbreviations and symbols
- 4 Preparation for calibration [Go to Page]
- 4.1 Reference standard
- Table 1 — Uncertainty of calibration torques
- 4.2 Condition and identification of a torque measuring device
- 4.3 Resolution of the indicator
- 4.4 Lower limit of calibration, Tmin
- 4.5 Rate of applied torque
- 4.6 Number of calibration orientations (see Annex A)
- 5 Preliminary procedure [Go to Page]
- 5.1 Alignment
- 5.2 Temperature considerations
- 5.3 Instrumentation set-up
- 5.4 Preloading procedure
- 6 Calibration procedure [Go to Page]
- 6.1 Selection of calibration torques
- 6.2 Application of calibration torques
- 6.3 Torque application rate validation
- 7 Calculation of results [Go to Page]
- 7.1 Determination of deflection, d
- 7.2 Determination of relative repeatability, R1
- 7.3 Determination of relative reproducibility, R2
- 7.4 Determination of relative errors of interpolation, Eit and Eitd
- 7.5 Determination of relative residual deflection, R0
- 7.6 Determination of relative reversibility, R3
- 7.7 Determination of relative errors of indication, Ei and Eid
- 7.8 Determination of uncertainty of measurement and relative measurement uncertainty interval
- 8 Classification of torque measuring devices [Go to Page]
- 8.1 General
- 8.2 Determination of a classification and its range
- Table 2 — Criteria for classification of torque measuring devices
- 9 Calibration certificate
- Annex A (informative) Orientation diagrams [Go to Page]
- Figure A.1 — Continuous application of torque
- Figure A.2 — Examples of preloading and calibration sequences for a torque measuring device
- Annex B (normative) Method and examples of determining uncertainty of the calibration results of the torque measuring device [Go to Page]
- Table B.1 — Summary of worked examples
- Table B.2A — Worked example in torque units: 100 N∙m torque measuring device clockwise torque, incremental series only
- Table B.2B — Worked example in torque units: 100 N∙m torque measuring device clockwise torque, incremental series only
- Table B.2C — Worked example in torque units: 100 N∙m torque measuring device clockwise torque, incremental series only
- Table B.3A — Uncertainties calculated in accordance with B.3
- Table B.3B — Uncertainties calculated in accordance with B.3
- Figure B.1 — Worked example in torque units: Deviation as a function of applied torque
- Table B.4A — Worked example in mV/V: 2 kN∙m torque measuring device clockwise torque, incremental series and decremental series
- Table B.4B — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series and decremental series
- Table B.4C — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series and decremental series
- Table B.5A — Uncertainties calculated in accordance with Annex B
- Table B.5B — Uncertainties calculated in accordance with Annex B
- Table B.6A — Uncertainty interval calculated in accordance with Annex B
- Table B.6B — Uncertainty interval calculated in accordance with Annex B
- Figure B.2 — Worked example in mV/V: Sensitivity as a function of applied torque
- Annex C (informative) Bandwidth [Go to Page]
- Figure C.1 — Examples of level torque signal response (acceptable) and -3 dB response (not acceptable)
- Figure C.2 — Illustration of data skew between an instantaneous torque value and the value due to sample points timing
- Bibliography [Go to Page]
