The main purpose of this paper is to show how to reach a high precision in calibration of angle measuring devices for industry. Actually, the demand for use of optical polygons is growing, manly for calibration of CNC machines, and so their own calibration. The article will deal with basic concept and the actual technology, giving information and testing results as well as the evaluation of the uncertainty using “CIRCLE CLOSURE”.

This paper deals with the traceability-assurance problems that are faced when a distributed measuring system is employed. These problems are highlighted for different distributed-system architecture, then a set of guidelines is provided in order to correctly manage such systems from a metrological point of view. The proposed solution is based on a network-assisted calibration procedure, which requires suitable travelling standards that are sent to the nodes of a distributed system under calibration and are remotely controlled through the Internet. Two prototypes of travelling standard are also described that have been designed in order to implement the proposed calibration procedure. The first prototype can be used for the calibration of system, which require tight temporal coherence, while the second one is able to calibrate measuring nodes that monitor the chemical pollution.

This work presents the experience of the National Laboratory for Ionizing Radiation Metrology (LNMRI) in the implementation of the requirements of the Mutual Recognition Arrangement (MRA) signed by 38 National Institutes of Metrology (NMI) in 1999. The degree of equivalence of activity reported by Bureau International des Poids et Mesures (BIPM) in the Key Comparison Data Base (KCDB), the main data of a specific radionuclide listed in the Calibration and Measurement Capabilities (CMC) and the implementation of a quality system are informed.

Replication of measurements and the combination of observations are standard and essential practices in metrology. They are done with different methods to match distinct purposes.

This paper presents a theoretic approach to measurement of the bottleneck times in production lines. The mathematical formalism utilized is characteristic for Discrete Event Systems approaches, and is about the Markov chains. Using this approach, we introduce definitions of bottlenecks, and we discuss their implications for production automation and preventative maintenance. The bottleneck of a production line is a machine that impedes the system performance in the strongest manner. The size of the buffer between the two machines is assumed to be finite. The approach is based on the sensitivity of the system production rate to machine reliability parameters.