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This paper introduces a proposed design for the first Serial-type Build-Up System (S-BUS). The work includes the design and implementation of two S-BUS prototypes, the metrological characteristics of the prototypes were evaluated. The evaluation results prove the validity of the system practically. The paper also discusses the key differences between the Parallel Build-Up System (P-BUS) and the S-BUS, and what makes it important to study the S-BUS concept.

In this article, we investigate the influence of the shaker armature’s mechanical structure on periodic force measurement, with particular emphasis on measurement uncertainty. In order to perform modal and harmonic analyses of the measurement setup, a finite element model was iteratively developed. The model was validated by measurements with a scanning vibrometer. The results show that the dynamic behaviour of the shaker armature should be taken into consideration before carrying out a periodic force measurement.

Uncertainty estimation is one of the very delicate tasks in the field of measurements. For the purpose of calibration of Charpy impact testing machines, it is necessary to evaluate and identify the expanded uncertainty. Factors affecting the uncertainty estimations are; the uncertainty of reference force and length measuring devices and its long-term instability (drift), machine resolution, rated energy error, indicated energy error, losses due to the drag of the pointer, friction losses in the bearing and air resistance, and other geometric parameters. In this study, the uncertainty estimation of the Charpy impact machines is based on the direct verification used in the BS DIN ISO 148-2 standard.