A. Mariscotti
In this work the problem is presented of generating an electric field in the HF and VHF range (few MHz to a hundred MHz) for immunity tests requiring high field intensity over a large volume of space. The spiral antenna architecture is discussed with respect to a series of parameters that are inter-related and influence field uniformity, beamwidth and overall gain (to be considered in terms of required rated power of the feeding amplifier). Reference is made to selected bibliography, that is not so abundant for our problem, the large part being for GHz range integrated applications. Some...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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A. Cataliotti, A. Daidone, G.Tinè
The aim of this paper is the development of a theoretical model of medium voltage (MV) cables in the frequency range 50-200 kHz which can be easily implemented in the Simulink® environment. Two transmission line configurations, line-ground and line-line were considered. The model requires the knowledge of the transmission channel parameters in the frequency domain. Thus, a characterization of MV cables in the two transmission line configurations by means of experimental measurements was performed on commonly used MV cables, RG7H1R, of different sections, 95 mm² and 185 mm² with aluminium...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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Antonio Cataliotti, Valentina Cosentino
This paper deals with a new single-point strategy for the detection of harmonic sources in power systems. It is based on the simultaneous measurement of three nonactive power quantities, which are derived from the approach of the IEEE Std. 1459-2000. The proposed method is an enhancement of a previous approach, already developed by the authors. The new strategy is easier to be implemented than the previous one, because it is based only on the separation of the fundamental components from the harmonic content of voltage and current. As regard this, the strategy can be entirely implemented in...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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A. Cataliotti, D. Di Cara, A. E. Emanuel, S. Nuccio
The harmonic active power is a useful power quality quantity. For example it is used in many algorithms for the detection of the harmonic source in a complex electrical network. The highest uncertainties in such kind of measurements are introduced by the transducers. In the paper is presented an experimental analysis of the effects of current transformer in the measurement of harmonic power. It is concluded that large phase angle errors can cause as larger errors as the phase shift between harmonic voltage and harmonic current get close to ±90. Moreover if such measurements are used to...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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Antonio Cataliotti, Valentina Cosentino, Alessandro Lipari, Salvatore Nuccio
This paper is focused on the problem of the metrological characterization of multifunction static meters based on integrated devices, in both reference and actual operating conditions. An experimental analysis is presented, which was performed on a commercial integrated device, in both sinusoidal and distorted conditions and both in the absence and in the presence of the measurement transducers. The experimental results show that the behaviour of the meters can be strongly influenced by the harmonics on voltage and current, depending on the operating principle of the meters, which is not...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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P. Arpaia, M. Buzio, V. Inglese
The principle of a data reduction algorithm, based on real-time adaptive sampling, specifically optimized for high-rate automatic measurement systems, is proposed. An adaptive sampling rule based on power estimation allows the optimum amount of information to be gathered in real time. The sampling rate is adapted when the limit conditions of insufficient/redundant information for the required signal processing is achieved. The tracking condition is defined by the reference power level in the Nyquist band necessary to the required post-processing procedure. Preliminary experimental results of...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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Marian Jerzy Korczynski, Zygmunt Lech Warsza
An idea of the new type of instrument, improved by pre-processing of the measurement data is presented in the paper. This instrument has an extensive data handling procedures, which allow to investigate different periodical and nonperiodical components in raw data and to clean the data from identified influences. Such cleaning upgrades the type A uncertainty evaluation. The developed instrument would be especially useful in technical diagnostic systems and medical testing instruments as well as in control systems in which different parameters are subjected to variation induced by internal or...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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Zygmunt Lech Warsza, Jarosław Makal
New approach to accuracy measures of open circuit transfer functions of the arbitrary variable arm resistance bridge supplied by current or voltage, are presented. Obstacle that near the bridge balance state relative errors or uncertainties are rising to ± ∞ was bypassed by relating the absolute value of any bridge accuracy measure to the initial sensitivity of the current to voltage bridge transfer function or of voltage to voltage transfer function as these sensitivities do not change within the bridge imbalance. The new double component approach is also introduced as sum of relative...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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Pasquale Arpaia, Fabrizio Clemente, Carlo Manna
The aim of this work is to measure the skin impedance recovery after electroporation by using low-voltage pulse protocol on human subject. Before and after electroporation, based on square wave pulses of 20-50 V, 5 μs, for 15-20 minutes, Electrical Impedance Spectroscopy (EIS) measurements has been performed, in the frequency range 0.5-10 kHz. Preliminary experimental results show a significant decrease in skin impedance amplitude after treatment. This result turns out to be useful in a measurement procedure aimed at determining the amount of drug actually transferred in...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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Loredana Cristaldi, Marco Faifer, Massimo Lazzaroni, Sergio Toscani
It is known that when a rotor fault occurs, an induction machine draws an alternative power at twice the rotor frequency. In previous work the authors have shown how to employ this phenomenon in order to detect rotor faults in small inverter fed induction machines. In particular, a rotor fault index has been presented and tested supposing that the AC drive main supply is single phase. Starting from this approach, in the present paper two new rotor fault indexes suitable for three-phase input AC drives will be proposed. Furthermore, their capability to detect early rotor faults in different...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
· TC4
· 2008
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