увод
ИСО (Међународна организација за стандардизацију) је глобални савез националних тела за стандардизацију (Тела чланица ИСО). Развој међународних стандарда се обично спроводи преко ИСО техничких комитета. Свака институција чланица заинтересована за предмет за који је основан технички комитет има право да буде заступљена у тој комисији. Међународне владине и невладине организације које су у вези са ИСО такође су укључене у овај посао. ИСО блиско сарађује са Међународном електротехничком комисијом (ИЕЦ) о свим питањима електричне стандардизације.

Процедуре које се користе за израду овог документа и оне које се користе за даље одржавање описане су у Делу 1 ИСО/ИЕЦ директиве. Нарочито, треба обратити пажњу на различите критеријуме одобрења који су потребни за различите типове ИСО докумената. This document has been drafted in accordance with the editing rules of ISO/IEC Directive Part 2 (види исо.орг/дирецтивес).

Please note that certain elements of this document may be subject to patent rights. ИСО није одговоран за идентификацију било ког или свих таквих патената. Details of any patent rights identified during the preparation of the document will be found in the introduction and/or in the list of patent claims received by ISO (see iso.org/patents).

ИСО 21968-2019 “Мерење дебљине премаза немагнетних металних превлака на металним и неметалним подлогама методом фазно осетљивих вртложних струја”

Any trade names used in this document are provided for the convenience of the user and do not constitute an endorsement.

Voluntary, related standards and conformity assessment related ISO specific terminology and express the meaning of and the ISO in the technical barriers to trade (ТБТ) adhere to the principle of the world trade organization (WTO) information, please see the iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/107, Metal and other Inorganic Coatings.

The second edition cancelled and replaced the technically revised first edition (ИСО 21968:2005). Главне промене у односу на претходно издање су следеће:

ИСО 21968-2019 “Мерење дебљине премаза немагнетних металних превлака на металним и неметалним подлогама методом фазно осетљивих вртложних струја”

This document has been adapted to the current requirements of ISO/IEC Guide 98-3 (also known as “GUM: 1995”);

– Added hints, practical examples, and simple estimates of measurement uncertainties for important factors;

– Added repeatability and reproducibility values for typical applications of the method;

– The attachment has been expanded for further application and experimental estimation of factors affecting accuracy.

Any feedback or questions regarding this document should be directed to the user’s national standards body. A complete list of these institutions can be found at iso.org/members.html.

ИСО 21968-2019 “Мерење дебљине премаза немагнетних металних превлака на металним и неметалним подлогама методом фазно осетљивих вртложних струја”

1 Домет
This document specifies a method for non-destructive measurement of the thickness of non-magnetic metal coatings on metal and non-metallic base materials using a phase-sensitive eddy current instrument, као такав:

а) Zinc, кадмијум, бакар, tin or chromium on steel;

б) Copper or silver on composites.

Compared to the amplitude-sensitive eddy current method specified in ISO 2360, the phase-sensitive method can be applied to smaller surface areas and stronger surface curvature without thickness errors and is less affected by the magnetic properties of the underlying material. Међутим, the phase-sensitive method is more affected by the electrical properties of the coating material.

In this document, the term “coating” is used for materials such as paints and varnishes, electroplating coatings, enamel coatings, plastic coatings, overcoats and powder coatings.

This method is especially suitable for the measurement of metal coating thickness. These coatings can be non-magnetic metal coatings on non-conductive, conductive, or magnetic substrates, or magnetic coatings on non-conductive or conductive substrates.

Metal coating measurements for metal-based materials are valid only if the product of the conductivity and permeability (σ, μ) of one of the materials is at least twice the product of the conductivity and permeability of the other material. The relative permeability of non-ferromagnetic materials is 1.

ИСО 21968-2019 “Мерење дебљине премаза немагнетних металних превлака на металним и неметалним подлогама методом фазно осетљивих вртложних струја”

2 Normative references
The following files are referenced in text in a manner that constitutes part or all of the requirements of this document. За датиране референце, примењује се само наведена верзија. For undated references, a new version of the reference (укључујући све ревизије) примењује.

ИСО 2064, Metallic and other Inorganic coatings – Definitions and practices relating to thickness measurement

ИСО 4618, paints and varnishes – Terms and definitions

ISO/IEC Guide 98-3, Uncertainty in measurement – Парт 3: Guidance for the expression of Uncertainty in Measurement (GUM: 1995)

3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2064, ИСО 4618 and the following articles apply.

ИСО 21968-2019 “Мерење дебљине премаза немагнетних металних превлака на металним и неметалним подлогама методом фазно осетљивих вртложних струја”

3.1 Adjustment of measurement system

A set of operations performed on a measurement system so that it provides a prescribed indication corresponding to a given value of the quantity to be measured

Белешка 1: The type of adjustment of a measuring system may include zero adjustment, offset adjustment, and range adjustment (sometimes called gain adjustment) of the measuring system.

Белешка 2: Adjustment of a measurement system should not be confused with calibration (3.2), which is a prerequisite for adjustment.

Белешка 3: After adjusting the measuring system, the measuring system should usually be recalibrated.

Белешка 4: Colloquially, the term “calibration” is often incorrectly used instead of the term “adjustment”. Similarly, the terms “verification” и “check” are often used in place of the correct terms “calibration”.

[Извор: ISO/IEC Guide 99:2007, 3.11 (also known as “VIM”), modified – article note 4 added.

3.2 Калибрација

Under specified conditions, the first step establishes a relationship between a quantitative value with the measurement uncertainty provided by the measurement standard and the corresponding indication with the relevant measurement uncertainty, and the second step uses this information to establish a relationship in order to obtain the measurement result from the indication

ИСО 21968-2019 “Мерење дебљине премаза немагнетних металних превлака на металним и неметалним подлогама методом фазно осетљивих вртложних струја”

Белешка 1: Calibration can be expressed in terms of sentences, calibration functions, calibration diagrams, calibration curves, or calibration tables. In some cases, it may include addition or multiplication correction for indications with associated measurement uncertainty.

Белешка 2: Calibration should not be confused with adjustment of the measurement system (3.1), often incorrectly referred to as “self-calibration”, nor should it be confused with calibration verification.

Белешка 3: Обично, the first step in the above definition is itself considered calibration.

[Извор: ISO/IEC Guide 99:2007, 2.39 (also known as “VIM”)]

Јаван је само одељак са стандардним информацијама. Да бисте видели цео садржај, морате купити стандард преко званичних канала.