Improved evaluation of measurement uncertainty and traceability in vibrometer calibration systems

This study presents an improved approach for evaluating measurement uncertainty and ensuring metrological traceability in vibrometer calibration systems. The proposed method enhances the implementation of ISO 16063-21 and GUM guidelines by integrating a detailed uncertainty budget with frequency-dependent correction factors. The calibration experiments were performed in the range of 10-1000 Hz using a reference comparison technique. The expanded uncertainty of the developed system was estimated as <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>U</mml:mi> <mml:mfenced separators="|"> <mml:mrow> <mml:mi>k</mml:mi> <mml:mo>=</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:mfenced> <mml:mo>=</mml:mo> <mml:mi mathvariant="normal"> </mml:mi> </mml:math> (1.7-2.1) %, depending on frequency and environmental stability. The novelty of the proposed approach lies in the refined identification of dominant uncertainty components – including reference sensor calibration, vibration table stability, and signal processing repeatability – with quantitative contribution analysis. The obtained results confirm the method’s capability to improve traceability and reproducibility in national and industrial calibration laboratories. The study provides a practical framework for enhancing accuracy, comparability, and long-term reliability of vibration measurement systems.