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BS 7882:2017

BS 7882:2017

$167.15

Method for calibration and classification of torque measuring devices

Published By Publication Date Number of Pages
BSI 2017 38
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This British Standard specifies requirements for the calibration and classification of torque measuring devices, including those used for the calibration of torque tools.

It describes the method of calibration, calculation of calibration results and the classification of the torque measuring device in a static mode. The information to be given on the certificate of calibration is also listed.

Annex A provides diagrams of the application of torque, and examples for the calibration of torque measuring devices. Annex B indicates how to determine uncertainty of the calibration results of the torque measuring device.

PDF Catalog

PDF Pages PDF Title
5 Foreword
7 1 Scope
2 Terms, definitions, abbreviations and symbols
9 3 Preparation for calibration
3.1 Reference standard
Table 1 — Uncertainty of calibration torques
10 3.2 Condition and identification of a torque measuring device
3.3 Resolution of the indicator
11 3.4 Lower limit of calibration, Tmin
3.5 Number of calibration orientations (see Annex A)
12 4 Preliminary procedure
4.1 Alignment
4.2 Temperature considerations
4.3 Instrumentation set-up
4.4 Preloading procedure
5 Calibration procedure
5.1 Selection of calibration torques
13 5.2 Application of calibration torques
6 Calculation of results
6.1 Determination of deflection, d
14 6.2 Determination of relative repeatability, R1
6.3 Determination of relative reproducibility, R2
15 6.4 Determination of relative errors of interpolation, Eit and Eitd
16 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
17 6.8 Determination of uncertainty of measurement and relative measurement uncertainty interval
7 Classification of torque measuring devices
7.1 General
7.2 Determination of a classification and its range
18 Table 2 — Criteria for classification of torque measuring devices
8 Calibration certificate
20 Annex A (informative)  Orientation diagrams
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
22 Annex B (normative)  Method example of determining uncertainty of the calibration results of the torque measuring device
25 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
26 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
27 Table B.3 — Uncertainties calculated in accordance with B.3 (continued)
28 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)
29 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
30 Table B.5 — Uncertainties calculated in accordance with Annex B (continued)
Table B.6 — Uncertainty interval calculated in accordance with Annex B
31 Table B.6 — Uncertainty interval calculated in accordance with Annex B (continued)
32 Table B.7 — Worked example in mV/V: 2 kN·m torque measuring device clockwise torque, incremental and decremental series
33 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)
34 Table B.8 — Uncertainties calculated in accordance with Annex B
Table B.8 — Uncertainties calculated in accordance with Annex B (continued)
35 Table B.9 — Uncertainty interval calculated in accordance with Annex B
Table B.9 — Uncertainty interval calculated in accordance with Annex B (continued)
36 Bibliography

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BS 7882:2017
$167.15