BS 7996:2018
$167.15
Torque measuring devices. Calibration and classification using continual torque application. Method
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 44 |
This British Standard specifies a method for the calibration and classification of torque measuring devices using continuous torque application where the inertial effects are minimal. This includes torque measuring devices used for the calibration of torque tools.
The information to be given on the certificate of calibration is also specified in this standard.
Annex A provides diagrams of the continuous application of torque, and examples for the calibration of torque measuring devices. Annex B gives an example of determining uncertainty of the calibration results of the torque measuring device. Annex C shows how to calculate mechanical and electronic bandwidth.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 5 | Foreword |
| 7 | 1 Scope 2 Normative references 3 Terms, definitions, abbreviations and symbols |
| 10 | 4 Preparation for calibration 4.1 Reference standard |
| 11 | Table 1 — Uncertainty of calibration torques 4.2 Condition and identification of a torque measuring device |
| 12 | 4.3 Resolution of the indicator |
| 13 | 4.4 Lower limit of calibration, Tmin 4.5 Rate of applied torque |
| 14 | 4.6 Number of calibration orientations (see Annex A) 5 Preliminary procedure 5.1 Alignment 5.2 Temperature considerations |
| 15 | 5.3 Instrumentation set-up 5.4 Preloading procedure 6 Calibration procedure 6.1 Selection of calibration torques |
| 16 | 6.2 Application of calibration torques 6.3 Torque application rate validation 7 Calculation of results 7.1 Determination of deflection, d |
| 17 | 7.2 Determination of relative repeatability, R1 7.3 Determination of relative reproducibility, R2 |
| 18 | 7.4 Determination of relative errors of interpolation, Eit and Eitd 7.5 Determination of relative residual deflection, R0 |
| 19 | 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 8.1 General |
| 20 | 8.2 Determination of a classification and its range |
| 21 | Table 2 — Criteria for classification of torque measuring devices 9 Calibration certificate |
| 23 | Annex A (informative) Orientation diagrams Figure A.1 — Continuous application of torque |
| 24 | Figure A.2 — Examples of preloading and calibration sequences for a torque measuring device |
| 25 | Annex B (normative) Method and examples of determining uncertainty of the calibration results of the torque measuring device |
| 28 | Table B.1 — Summary of worked examples |
| 29 | 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 |
| 30 | Table B.3A — Uncertainties calculated in accordance with B.3 Table B.3B — Uncertainties calculated in accordance with B.3 |
| 31 | Figure B.1 — Worked example in torque units: Deviation as a function of applied torque |
| 32 | Table B.4A — Worked example in mV/V: 2 kN∙m torque measuring device clockwise torque, incremental series and decremental series |
| 33 | Table B.4B — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series and decremental series |
| 34 | Table B.4C — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental series and decremental series |
| 35 | Table B.5A — Uncertainties calculated in accordance with Annex B |
| 36 | Table B.5B — Uncertainties calculated in accordance with Annex B |
| 37 | Table B.6A — Uncertainty interval calculated in accordance with Annex B Table B.6B — Uncertainty interval calculated in accordance with Annex B |
| 38 | Figure B.2 — Worked example in mV/V: Sensitivity as a function of applied torque Annex C (informative) Bandwidth |
| 39 | Figure C.1 — Examples of level torque signal response (acceptable) and -3 dB response (not acceptable) |
| 40 | Figure C.2 — Illustration of data skew between an instantaneous torque value and the value due to sample points timing |
| 42 | Bibliography |
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