ДСТУ EN ISO 2178:2022 Немагнітні покриття на магнітних підкладках. Вимірювання товщини покриття. Магнітний метод (EN ISO 2178:2016, IDT; ISO 2178:2016, IDT)



ДСТУ EN ISO 2178:2022
(EN ISO 2178:2016, IDT; ISO 2178:2016, IDT)

Немагнітні покриття на магнітних підкладках.
Вимірювання товщини покриття. Магнітний метод

 

 
   
 
Не є офіційним виданням.
Офіційне видання розповсюджує національний орган стандартизації
(ДП «УкрНДНЦ» http://uas.gov.ua)

Contents

Foreword

1 Scope

2 Normative references

3 Terms and definitions

4 Principle of measurement

4.1 Basic principle of all magnetic measurement methods

4.2 Magnetic pull-off method

4.3 Magnetic inductive principle

4.4 Magnetic flux gauge

5 Factors affecting measurement accuracy

5.1 Basic influence of the coating thickness

5.2 Magnetic properties of the base metal

5.3 Electrical properties of the coating materials

5.4 Geometry: base metal thickness

5.5 Edge effect

5.6 Geometry: surface curvature

5.7 Surface roughness

5.8 Cleanliness: lift-off effect

5.9 Probe pressure

5.10 Probe tilt

5.11 Temperature effects

5.12 External electromagnetic fields

6 Calibration and adjustment of the instrument

6.1 General

6.2 Thickness reference standards

6.3 Methods of adjustment

7 Measurement procedure and evaluation

7.1 General

7.2 Number of measurements and evaluation

8 Uncertainty of the results

8.1 General remarks

8.2 Uncertainty of the calibration of the instrument

8.3 Stochastic errors

8.4 Uncertainties caused by factors summarized in Clause

8.5 Combined uncertainty, expanded uncertainty and final result

9 Precision

9.1 General

9.2 Repeatability (r)

9.3 Reproducibility limit (R)

10 Test report

Annex A (informative) Basic principle of all measurement methods

Annex B (informative) Basic performance requirements for coating thickness gauges which are based on the magnetic method described in this International Standard

Annex C (informative) Examples of experimental estimation of factors affecting the measurement

Annex D (informative) Example of uncertainty estimation (see Clause 8)

Annex E (informative) Basics of the determination of the uncertainty of a measurement of the used measurement method corresponding to ISO/IEC Guide 98-3

Annex F (informative) Table of the student factor

Annex G (informative) Details on precision

Bibliography