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Chiheb Rebai, Dominique Dallet, Philippe Marchegay
MEASUREMENT ACCURACY OF FILTER BANK BASED ADC BUILT IN SELF TEST

In this paper, we present the analysis of Built-In-Self-Test (BIST) scheme for Analogue to Digital Converter (ADC). This work focuses on a filter bank based BIST for power spectral density measurement. Digital filter structure will be used to decompose the ADC output signal into its main spectral components. Numerical simulations are conducted to validate our idea and the results show that the scheme is a promising BIST approach for ADC.

Pavol Mikulik, Ján Šaliga
REALISATION OF ADC ERROR CORRECTION BASED ON VOLTERRA FILTERING

Dynamic non-linearity of Analog-to-digital converters (ADC) contributes significantly to the distortion of digitalised signals. This paper deals with implementing Volterra filtration technique for compensation of dynamic non-linearities in ADCs. The method is demonstrated on measurements on real Integrating ADC, and method effectiveness is analysed.

Jan Holub, Josef Vedral
ASPECTS OF ADC EFFECTIVE RESOLUTION: DEFINITIONS AND MEASUREMENTS

The article describes some aspects of understanding, defining and measurements of effective resolution of Analogue-to-Digital Converters. The disadvantages and misleading results of commonly used definition are shown and possible solutions are discussed. Finally, one new solution is given and arguments for its correctness and usability are collected.

Domenico Grimaldi, Linus Michaeli, Peter Michalko
IDENTIFICATION OF ADC ERROR MODEL BY TESTING OF THE CHOSEN CODE BINS

Modelling of ADC allows to utilize testing of selected parameters for determination of its error model over whole operating range. While the integrating ADC model is characterised by polynomial shape of integral nonlinearity, the successive approximation ADCs are characterised by periodical appearance of significant values of differential nonlinearities related with each code bit. Unified behavioural error model cover wide scale of possible structures. The vicinity of tested integral nonlinearities with the modelled shape is shown on the base of the experimental results for two representatives of ADCs. The impact of the model parameter selection on the model accuracy is being studied in the paper. Those outcomes allow to choose the optimal fast testing method.

Pasquale Arpaia, Luca De Vito, Sergio Rapuano, Gioacchino Truglia
A MEASUREMENT INSTRUMENT FOR FAULT DIAGNOSIS IN QAM-BASED TELECOMMUNICATIONS

A method for diagnosing faults in communication systems based on QAM (Quadrature Amplitude Modulation) modulation scheme is proposed. The most relevant faults affecting this modulation have been observed and modelled. Such faults, individually and combined, are classified and estimated by analysing the statistical moments of the received symbols. Simulation and experimental results of characterisation and validation highlight the practical effectiveness of the proposed method.

Roberto Giannini, Hrvoje Džapo
EMBEDDED DEVICE CONCEPT FOR EARTH SURFACE POTENTIALS MEASUREMENTS OF A GROUNDING SYSTEM

Large substation grounding system needs to be periodically inspected in order to assure safe and reliable original purpose. Due to complicated measurements including a large amount of measuring points and a complex evaluation of measuring results, final results and conclusions are not immediately obvious. The basic idea is to build an intelligent system in order to get a rapid overview of a grounding system condition with a detailed measurement plan and on-site data analysis feasibility. For this purpose, an embedded device concept for earth surface potentials measurements of a grounding system is proposed. The described device acts as a portable measuring subsystem in conjunction with a personal computer-based integrated program environment or as a stand-alone measuring unit. The presented concept showed excellent properties regarding measurement time saving and measurement costs reduction, by simplifying the project manipulation and by automating the measuring procedures, analysis and documenting

Hrvoje Džapo, Roberto Giannini
INTEGRATED ENVIRONMENT FOR DATA MANAGEMENT IN EARTH SURFACE POTENTIALS MEASUREMENTS OF A GROUNDING SYSTEM

Process of validating substation grounding system includes extensive measurements of earth surface potentials and complex measuring results analysis. In order to automate and improve validation process, a customized automated measuring system needed to be developed. It consists of an intelligent measuring device and integrated program environment for measurement data management and analysis on personal computer. This paper describes measurement methodology concepts along with implementation issues of an integrated program environment as a part of such a system. Measuring project concept has been elaborated in details as a foundation for building an integrated program environment which conforms to methodology concepts. Implementation details of some specific program modules are also presented in order to clarify and extend methodology concepts.

Zbigniew Zabek, Waldemar Kielek, Tadeusz Knap
THE BALLISTIC ABSOLUTE GRAVIMETER ZZG2

The construction and measurement method of transportable absolute Earth’s gravity meter having the relative accuracy of the order of 10-9 is given. The instrument is composed of few separate units. The construction of mechanical and optical units is described in brief only. The construction of electronic units, an measurement method used in the instrument, and original algorithm developed by Z. Zabek and T. Knap to obtain the result of absolute value of local earth gravity acceleration with top actually achievable accuracy are described more in detail.

Khanh Tran Duy, Christian Eugene
ON-LINE HYDROCARBONS DETECTION IN WASTEWATER TREATMENT PLANT

Monitoring of hydrocarbon pollutants at the entrance of wastewater treatment plants is imperative for keeping them in good working order. The systems of detection existing on the market place are firstly analysed in order to understand why they are not an effective solution to the problem. The needed characteristics of an acceptable system follows from this analysis. A study of the different methods applicable to the distinction hydrocarbon/water allowed to highlight the attractive method of fluorescence. The main originality of our paper is the transposition of this method to the problem of concern. We conclude by the validation of our method through an in-situ preliminary test.

Antonio Boscolo, Claudio Mangiavacchi, Barbara Piuzzi, Marco Ulian
KNOWLEDGE BASED CLASSIFIER FOR LANDFILL OLFACTIVE INJURIES

This paper shows some of the most significant aspects addressed during the development of an odour classifier. In particular for one devoted to the monitoring of olfactive injuries caused by the presence of a municipal solid waste (MSW) landfill. A description of the methodologies used in the sensor array choice and in the development of the measurement chamber is given after a brief description of the state of the art and the state of the research in the field of waste disposal. The paper ends with the more significant results obtained.

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