panimula
ISO (International Organization para sa Standardisasyon) ay isang pandaigdigang alyansa ng mga pambansang pamantayan katawan (Mga katawan ng miyembro ng ISO). Ang pagbuo ng mga internasyonal na pamantayan ay karaniwang isinasagawa sa pamamagitan ng ISO teknikal na komite. Ang bawat institusyon ng miyembro na interesado sa isang paksa kung saan itinatag ang isang teknikal na komite ay may karapatang kumatawan sa komiteng iyon. Ang mga internasyonal na organisasyon ng pamahalaan at di pamahalaan na nakikipag ugnayan sa ISO ay kasangkot din sa gawaing ito. ISO ay gumagana nang malapit sa International Electrotechnical Commission (IEC) sa lahat ng bagay ng electrical standardization.

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Mangyaring tandaan na ang ilang mga elemento ng dokumentong ito ay maaaring sumailalim sa mga karapatan sa patent. Ang ISO ay hindi mananagot para sa pagtukoy ng anuman o lahat ng naturang patente. Ang mga detalye ng anumang mga karapatan sa patent na natukoy sa panahon ng paghahanda ng dokumento ay matatagpuan sa pagpapakilala at / o sa listahan ng mga claim ng patent na natanggap ng ISO (tingnan iso.org/patents).

ISO 21968-2019 “Measurement of coating thickness of non-magnetic metallic coatings on metallic and non-metallic substrates by phase-sensitive eddy current method”

Ang anumang mga pangalan ng kalakalan na ginamit sa dokumentong ito ay ibinigay para sa kaginhawahan ng gumagamit at hindi bumubuo ng isang endorsement.

Kusang loob, kaugnay na pamantayan at pag alinsunod pagtatasa kaugnay ISO tiyak na terminolohiya at ipahayag ang kahulugan ng at ang ISO sa mga teknikal na hadlang sa kalakalan (TBT) sumunod sa prinsipyo ng world trade organization (WTO) impormasyon, pakitingnan ang 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 (ISO 21968:2005). Ang mga pangunahing pagbabago mula sa nakaraang edisyon ay ang mga sumusunod:

ISO 21968-2019 “Measurement of coating thickness of non-magnetic metallic coatings on metallic and non-metallic substrates by phase-sensitive eddy current method”

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.

Anumang feedback o mga katanungan tungkol sa dokumentong ito ay dapat na idirekta sa pambansang pamantayan ng katawan ng gumagamit. Ang kumpletong listahan ng mga institusyong ito ay matatagpuan sa iso.org/members.html.

ISO 21968-2019 “Measurement of coating thickness of non-magnetic metallic coatings on metallic and non-metallic substrates by phase-sensitive eddy current method”

1 Saklaw
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, tulad ng:

a) Zinc, cadmium, tanso, tin or chromium on steel;

b) 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. Gayunpaman, the phase-sensitive method is more affected by the electrical properties of the coating material.

In this document, the term “patong na patong” 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.

ISO 21968-2019 “Measurement of coating thickness of non-magnetic metallic coatings on metallic and non-metallic substrates by phase-sensitive eddy current method”

2 Mga reperensyang normatibo
The following files are referenced in text in a manner that constitutes part or all of the requirements of this document. Para sa mga petsang sanggunian, ang binanggit na bersyon lamang ang nalalapat. Para sa mga walang petsang sanggunian, isang bagong bersyon ng sanggunian (kasama ang anumang mga rebisyon) angkop.

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

ISO 4618, mga pintura at barnis – Mga tuntunin at kahulugan

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

3 Mga tuntunin at kahulugan
Para sa mga layunin ng dokumentong ito, ang mga termino at kahulugan na ibinigay sa ISO 2064, ISO 4618 at ang mga sumusunod na artikulo ay nalalapat.

ISO 21968-2019 “Measurement of coating thickness of non-magnetic metallic coatings on metallic and non-metallic substrates by phase-sensitive eddy current method”

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

Tala 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.

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

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

Tala 4: Colloquially, the term “calibration” is often incorrectly used instead of the term “adjustment”. Katulad din nito, ang mga katagang “verification” at “check” are often used in place of the correct terms “calibration”.

[Pinagmulan: ISO/IEC Guide 99:2007, 3.11 (also known as “VIM”), binago ang – article note 4 idinagdag pa.

3.2 Pag calibrate

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

ISO 21968-2019 “Measurement of coating thickness of non-magnetic metallic coatings on metallic and non-metallic substrates by phase-sensitive eddy current method”

Tala 1: Calibration can be expressed in terms of sentences, calibration functions, calibration diagrams, calibration curves, or calibration tables. Sa ilang mga kaso, it may include addition or multiplication correction for indications with associated measurement uncertainty.

Tala 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.

Tala 3: Sa pangkalahatan, the first step in the above definition is itself considered calibration.

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

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