BS EN ISO 2360:2017

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle of measurement
5 Factors affecting measurement uncertainty
6 Calibration and adjustment of the instrument
7 Measurement procedure and evaluation
8 Uncertainty of the results
9 Precision
10 Test report
Annex A (informative) - Eddy-current generation in
        a metallic conductor
Annex B (informative) - Basics of the determination
        of the uncertainty of a measurement of the used
        measurement method corresponding to
        ISO/IEC Guide 98-3
Annex C (informative) - Basic performance requirements
        for coating thickness gauges which are based on the
        amplitude-sensitive eddy-current method described
        in this document
Annex D (informative) - Examples for the experimental
        estimation of factors affecting the measurement
        accuracy
Annex E (informative) - Table of the student factor
Annex F (informative) - Example of uncertainty estimation
Annex G (informative) - Details on precision
Bibliography

Describes a method for non-destructive measurements of the thickness of non-conductive coatings on non-magnetic electrically conductive base metals, using amplitude-sensitive eddy-current instruments.

This document specifies a method for non-destructive measurements of the thickness of non-conductive coatings on non-magnetic electrically conductive base metals, using amplitude-sensitive eddy-current instruments.

In this document, the term “coating” is used for materials such as, for example, paints and varnishes, electroplated coatings, enamel coatings, plastic coatings, claddings and powder coatings.This method is particularly applicable to measurements of the thickness of most oxide coatings produced by anodizing, but is not applicable to all conversion coatings, some of which are too thin to be measured by this method (see Clause6).

This method can also be used to measure non-magnetic metallic coatings on non-conductive base materials. However, the phase-sensitive eddy-current method specified in ISO21968 is particularly usable to this application and can provide thickness results with a higher accuracy (see AnnexA).

This method is not applicable to measure non-magnetic metallic coatings on conductive base metals. The phase-sensitive eddy-current method specified in ISO21968 is particularly useful for this application. However, in the special case of very thin coatings with a very small conductivity, the amplitude-sensitive eddy-current method can also be used for this application (see AnnexA).

Although the method can be used for measurements of the thickness of coatings on magnetic base metals, its use for this application is not recommended. In such cases, the magnetic method specified in ISO2178 can be used. Only in case of very thick coatings above approximately 1mm, the amplitude-sensitive eddy-current method can also be used for this application (see AnnexA).