ISO 1463:2021 pdf download – Metallic and oxide coatings — Measurement of coating thickness — Microscopical method. Repeated calibrations of the micrometer eyepiece can be reasonably expected to have a spread of less than 1 %. The distance between the two lines of a stage micrometer used for the calibration shall be known to within 0,2 µm or 0,1 %, whichever is the greater. Some image splitting micrometer eyepieces have a nonlinearity that introduces an uncertainty of up to 1 % for short measurement distances. Uncertainties can be introduced by backlash in the movement of the micrometer eyepiece. To avoid...