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Highest-level traceability of dimensional measurements in the Laboratory for Production Measurement (LTM) at University of Maribor (a nationally designated metrology institute), consistent with the Mutual Recognition Arrangement by the International Committee for Weights and Measure, is presented. A reliable primary laser frequency standard is important for national chains of industrial calibrations and measurements. Laser stabilization technique and calibration procedure for investigating the stability and reproducibility of HeNe lasers, used for interferometry length measurements, are described. Along the international interlaboratory comparisons, the calibration accuracy is periodically verified using a highly stable interferometer laser, by a simple method presented in this contribution. [ABSTRACT FROM AUTHOR]

Precise calibration of quartz line scales is very important for assuring traceability of microscopic measurements. Very significant influence in calibration uncertainty budget is represented by uncertainty of line centre detection. Line centre is usually detected through video signal processing using different types of algorithms. This paper is presenting calibration procedure that was developed in the Laboratory for Production Measurement at the Faculty of Mechanical Engineering in Maribor. It is focused in uncertainty analysis and especially in the influence of line scale contamination on determination of line centre position. Different types of line scale contamination like dirt spots, scratches, line edge incorrectness, and line intensity were simulated in order to test the ability of the line centre detection algorithm to eliminate such influences from the measurement results. [ABSTRACT FROM AUTHOR]