Jan Malinsky
This contribution deals with modelling of a selected part of the new automotive communication standard FlexRay. In particular, it focuses on the mechanizm ensuring start of a FlexRay network. The model has been created with the use of timed automata and verified. For this purpose the UPPAAL software tool has been used that allows modelling of discrete even systems with the use of timed automata and subsequently to verify the model with the use of suitable queries compiled in the temporal logic. This model can be used for searching incorrect settings of time parameters of nodes in the network...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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Haifa FARES, Chiheb REBAI, Bertrand LE GAL, Dominique DALLET
This paper presents an efficient design of a decimation filter for a continuous-time (CT) complex bandpass ΔΣ modulator in wideband-standards receiver. The RF front-end has been based on a modified low-IF architecture and the full receiver dynamic range is converted into the digital domain. The approach proposed investigates a new decimation process and realizes new functionalities such as image rejection and frequency down conversion IF/DC by a complex mixing on ΣΔ modulator bit stream. Two wide standards (IEEE 802.11a and 802.16) were chosen for design procedure illustration....
Vaclav Papez, Stanislava Papezova
The functions of measuring instruments and measured equipments are always affected by technical parameters of the electrical energy, which supplies apparatus and arrangements. Disturbing signals, which are propagate by power line along the supply system or by the form of radiated electromagnetic waves, get through measuring circuits. By norms defined arrangement immunity against the disturbance guarantees only a limited influence of the acceptable disturbance on measuring apparatus, this disturbance also affects the analysed arrangements. The disturbance levels that are also multiple less...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
· Download
Stanislava Papezova,Vaclav Papez
This paper describes a system, which enables quantitative monitoring and evaluation of the influence of a pulse magnetic field on a live organism by using of bioimpedance measurement. Electric impedance of tissue varies according to the amount of blood contained in a segment at a given instant. Because blood has greater conductivity than tissue, the presence of a slightly increased amount of blood decreases the impedance of the tissue. The magneto-therapeutic instrument uses a couple of Helmholtz coils as the applicator. The magnetic field strength is approximately 60 mT. The current of...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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Petar Mostarac, Hrvoje Hegeduš, Roman Malarić
This paper describes the comparison of a two inertial sensing boards based on Freescale™ accelerometer MMA7260QT. Measurement results have shown that they are dependable on voltage supply. It is known that acceleration measurements depend on interferences and numerous noise sources. We have examined the offset fluctuation/moving bias of two inertial sensing boards generated by temperature and time dependency.
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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Marija Čundeva-Blajer, Ljupčo Arsov, Luka Ferković, Roman Malarić, Damir Ilić
In this paper, metrological infrastructure of Macedonia and Croatia will be presented in general, but more speciffically for measurement of high voltages and currents. As two countries become independent almost 20 years ago, they embarked on a similar metrological path, earning to strenghten international ties, to get more involved in organizations such as Euromet, to receive accreditation for the national measurement institutes, etc. However, as the two countries have emerging economies, it is sometimes difficult to develop all the necessary measurement methods, especially methods that need...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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Thomas E. Linnenbrink, William B. Boyer, Robert M. Graham, Nicholas G. Paulter, Jr., Steven J. Tilden
There is a world-wide need to standardize terms, test methods, and the computation of performance parameters for devices that generate, measure, and analyze waveforms. Users need to be able to unambiguously specify the device performance required for particular applications. Manufacturers need to be able to unambiguously state the performance of their devices (e.g., instruments, components, etc.). Metrology facilities need to perform calibrations with well-defined methods to produce reliable test results expressed in clear terms. Measurement instruments need to acquire data with well-defined...
A. Carta, N. Locci, C. Muscas, S. Sulis
Monitoring, control and management of modern electric power systems require more and more extensively the use of distributed measurement systems capable of providing accurate data from remote measurement stations located in the network nodes. Synchronization between the acquisition devices is one of the most critical tasks in designing such systems, since in many cases the practical usability of the measured data strictly depends on how accurate the time reference used in the remote stations is. When highly accurate time synchronization is needed, satellite systems, like GPS, can be used to...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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M. B. Wanderley, C. P. Souza
The Linear Variable Differential Transformer (LVDT) is an inductive sensor which is used to measure linear displacement and finds uses in modern machine-tool, robotics, avionics, and computerized manufacturing. Its basic structure consists of a primary coil and two secondary coils like an electrical transformer. However, LVDT has a movable magnetic core that when the primary coil is excited with an AC voltage source, induced secondary voltages vary with the displacement of the core. In general, this accurate and reliable displacement-to-electrical sensor can be modeled in two forms:...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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Ireneusz Bemke, Romuald Zielonko
The main subject of authors’ research are non-contact methods of glass breaks detection based on analysis of acoustic signal generated during phenomena. Problem has essential meaning for modern, cost effective alarm systems, particularly installed into big buildings. Signal has stochastic character and the main difficulty of the problem is variability of many parameters (e.g. size and thickness of glass pane, distance from window to detector) and big amount of false signals (mainly accidental glass hits without break). Authors developed detection algorithm which uses Wavelet Transformation...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
· Download