BS 7118-2:1989
Current
The latest, up-to-date edition.
Measurement of fluid flow: assessment of uncertainty in the calibration and use of flow measurement devices Non-linear calibration relationships
Hardcopy , PDF
English
29-09-1989
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National foreword
Committees responsible
0. Introduction
1. Scope and field of application
2. References
3. Definitions
4. Symbols and abbreviations
5. Curve fitting
5.1 General
5.2 Computational methods
5.3 Selecting the optimum degree of fit
6. Uncertainty
Annexes
A. Regression methods
B. Orthogonal polynomial curve fitting
C. Computer program using orthogonal polynomials
D. Examples
E. Finite-difference method
Procedures for fitting a quadratic, cubic or higher degree polynomial expression to a non-linear set of calibration data using the least squares criterion and assessing the uncertainty associated with the resulting calibration curve.
| Committee |
CPI/30
|
| DevelopmentNote |
Also numbered as ISO 7066-2 Supersedes 85/29857 DC (09/2005)
|
| DocumentType |
Standard
|
| Pages |
32
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
This part of ISO 7066 describes the procedures for fitting a quadratic, cubic or higher degree polynomial expression to a non-linear2) set of calibration data, using the least-squares criterion, and of assessing the uncertainty associated with the resulting calibration curve. It considers only the use of polynomials with powers which are integers.
Because it is generally not practicable to carry out this type of curve fitting and assessment of uncertainty without using a computer, it is assumed in this part of ISO 7066 that the user has access to one. In many cases it will be possible to use standard routines available on most computers; as an alternative the FORTRAN program listed in Annex C may be used.
Examples of the use of these methods are given in Annex D.
Extrapolation beyond the range of the data is not permitted.
Annex A, Annex B, Annex C, Annex D and Annex E do not form integral parts of this part of ISO 7066.
| BS 7825-2:1996 | Calibration of rubber and plastics test equipment Calibration procedures |
| BS EN 60041:1995 | Field acceptance tests to determine the hydraulic performance of hydraulic turbines, storage pumps and pump-turbines |
| BS EN 29104:1993 | Measurement of fluid flow in closed conduits. Methods of evaluating the performance of electromagnetic flow-meters for liquids |
| BS 3680-3B:1997 | Measurement of liquid flow in open channels. Stream flow measurement Guide for the establishment and operation of a gauging station |
| EN 29104:1993 | Measurement of fluid flow in closed conduits - Methods of evaluating the performance of electromagnetic flow-meters for liquids (ISO 9104:1991) |
| BS 7118-1:1990 | Measurement of fluid flow: assessment of uncertainty in the calibration and use of flow measurement devices Linear calibration relationships |
| ISO/TR 7066-1:1997 | Assessment of uncertainty in calibration and use of flow measurement devices — Part 1: Linear calibration relationships |
| BS 5844:1980 | Methods of measurement of fluid flow: estimation of uncertainty of a flow-rate measurement |
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