Standard
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AS 3778.6.3:2023
[Current]Measurement of water flow in open channels, Part 6.3: Measuring devices, instruments and equipment — Calibration of rotating element current-meters in straight open tanks (ISO 3455:2021, IDT)
AS 3778.6.3:2023 identically adopts ISO 3455:2021, which specifies a calibration method for mechanical type, electromagnetic type and acoustic type hydrometric current-meters used for point velocity measurement of flowing water
Published: 17/11/2023
Pages: 13
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle of calibration
4.1 Statement of the principle
4.2 Accuracy of the method
4.2.1 Overall uncertainty on the velocity measurement
4.2.2 Requirements for accurate measurements
5 Infrastructure
5.1 Dimensions of the towing tank
5.1.1 General
5.1.2 Length
5.1.3 Depth and width
5.2 Towing cart
5.2.1 General
5.2.2 Cart track system
5.2.3 Types of towing carts
5.2.4 Cart operation
5.2.5 Cart control
5.3 Measuring equipment
5.3.1 General
5.3.2 Distance measurement
5.3.3 Time measurement
5.3.4 Current-meter velocity measurement
5.3.5 Sources of error related to infrastructure
5.3.5.1 General
5.3.5.2 Error due to the distance measurement
5.3.5.3 Error due to timing measurement
5.3.5.4 Error due to residual currents in the water
5.3.5.5 Error due to environmental conditions
5.3.5.6 Random errors
5.4 Data acquisition
5.5 Data processing
5.6 Other requirements
6 Calculation of uncertainty
7 Calibration procedure
7.1 Calibration of rotating element current-meters
7.1.1 Suspension of the current-meter
7.1.2 Performance of calibration
7.1.2.1 Minimum speed of response
7.1.2.2 Number of calibration points
7.1.2.3 Stilling time
7.1.3 Data analysis
7.1.3.1 Velocity v and the rotation rate n
7.1.3.2 Determination of outliers
7.1.3.3 Calibration formulae
7.1.4 Presentation of results
7.2 Calibration of electromagnetic current-meters
7.2.1 Instructions for calibration
7.2.2 Mounting the electromagnetic current-meter
7.2.3 Number of calibration points
7.2.4 Performance of calibration
7.2.5 Data analysis
7.2.6 Presentation of results
7.3 Calibration of acoustic current-meters for point velocity measurement
7.3.1 Instructions for calibration
7.3.2 Mounting the acoustic current-meter
7.3.3 Performance of calibration
7.3.3.1 Number of calibration points
7.3.3.2 Stilling time
7.3.4 Data analysis
7.3.5 Presentation of results
Bibliography
Cited references in this standard
[Current]
Uncertainty of measurement - Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) - SUPPLEMENT 2: Extension to any number of output quantities
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