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  2. Harmonized System - Wikipedia

    en.wikipedia.org/wiki/Harmonized_System

    The process of assigning HS codes is known as "HS Classification". All products can be classified in the HS by using the General Rules for the Interpretation of the Harmonized System ("GRI") that must be applied in strict order. HS codes can be determined by a variety of factors including a product's composition, its form and its function.

  3. Calibration - Wikipedia

    en.wikipedia.org/wiki/Calibration

    The formal definition of calibration by the International Bureau of Weights and Measures (BIPM) is the following: "Operation that, under specified conditions, in a first step, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties (of the calibrated instrument or ...

  4. Certified reference materials - Wikipedia

    en.wikipedia.org/wiki/Certified_reference_materials

    Certified reference materials (CRMs) are 'controls' or standards used to check the quality and metrological traceability of products, to validate analytical measurement methods, or for the calibration of instruments. [1] A certified reference material is a particular form of measurement standard.

  5. Instrument error - Wikipedia

    en.wikipedia.org/wiki/Instrument_error

    Instruments should be calibrated against a standard instrument that is known to be accurate, and ideally the calibration should be repeated at intervals. The most rigorous standards are those maintained by a standards organization such as NIST in the United States , or the ISO in Europe.

  6. List of abbreviations in oil and gas exploration and production

    en.wikipedia.org/wiki/List_of_abbreviations_in...

    CGTL – compact gas to liquids (production equipment small enough to fit on a ship) CHCNC – CHCNC gamma ray casing collar locator; CHDTP – calliper HDT playback log; CHECK – checkshot and acoustic calibration report; CHESM – contractor, health, environment and safety management; CHF – casing head flange

  7. ISO/IEC 17025 - Wikipedia

    en.wikipedia.org/wiki/ISO/IEC_17025

    ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories is the main standard used by testing and calibration laboratories. In most countries, ISO/IEC 17025 is the standard for which most labs must hold accreditation in order to be deemed technically competent.

  8. Hegman gauge - Wikipedia

    en.wikipedia.org/wiki/Hegman_gauge

    A Hegman gauge, sometimes referred to as a grind gauge, grind gage, or grindometer, is an instrument which indicates the fineness of grind or the presence of coarse particles and agglomeration in a dispersion. [1]

  9. Measuring Instruments Directive - Wikipedia

    en.wikipedia.org/wiki/Measuring_Instruments...

    The Measuring Instruments Directive 2014/32/EU, formerly 2004/22/EC, is a directive by the European Union, which seeks to harmonise many aspects of legal metrology across all member states of the EU. [1]

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