BS EN ISO 2808:2019 pdf free.Paints and varnishes – Determination of film thickness (ISO 2808:2019).
calibration 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 and, in a second step, uses this information to establish a relation for obtaining a measurement result from an indication
Note 1 to entry: A calibration may be expressed by a statement, calibration function, calibration diagram, calibration curve, or calibration table. In some cases, it may consist of an additive or multiplicative correction of the indication with associated measurement uncertainty. Note 2 to entry: Calibration should not be confused with adjustment of a measuring system, often mistakenly called “self-calibration”, nor with verification of calibration. Note 3 to entry: Often, the first step alone in the above definition is perceived as being calibration. [SOURCE: ISO/IEC Guide 99:2007, 2.39]adjustment adjustment of a measuring system set of operations carried out on a measuring system so that it provides prescribed indications corresponding to given values of a quantity to be measured Note 1 to entry: Types of adjustment of a measuring system include zero adjustment of a measuring system, offset adjustment, and span adjustment (sometimes called gain adjustment). Note 2 to entry: Adjustment of a measuring system should not be confused with calibration, which is a prerequisite for adjustment. Note 3 to entry: After an adjustment of a measuring system, the measuring system must usually be recalibrated. Note 4 to entry: Most digital measurement instruments can be adjusted on a thickness standard or on a shim, where the thickness of the coating or of the shim is known. [SOURCE: ISO/IEC Guide 99:2007, 3.11, modified一Note 4 to entry has been added and “adjustment” is used as the first preferred term.]The mechanical principle is suitable for all film-substrate combinations. The substrate has to be flat in at least one direction in the area where the measurement is performed. Curvature of the surface in a single plane is permissible (e.g. internal or external surface of pipes).BS EN ISO 2808 pdf download.