Wenfang Liu, ChongMin Song, Jun Zhao
This paper describes a method for restraining electromagnetic interference received by reference meter clearly not caused by watt-hour meter under test by means of pulse width testing circuit. The method is adopted to resolve the problems often occurred in the type tests of watt-hour meters. During the EMC test of watt-hour meters, the tester can’t confirm the additional error due to the impact of fast transient burst because the reference meter as the auxiliary instrument in the test is impacted and display the wrong percentage error. We resolve the test problem caused from the disturbance...
TC4 Symposium 2013
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· 2013
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Benjamin Sanchez, Ebrahim Louarroudi, Rik Pintelon, Ramon Bragos
The electrical bioimpedance (EBI) measurement of varying biological systems Z ( &omega , t ) (e.g. the heart, the lungs, …) by means of electrical impedance spectroscopy (EIS) remains an open challenge today. Briefly stated, the bioimpedance is widely assumed to be time-invariant when it is measured with the frequency sweep EIS approach. Hence, time-varying changes are thus ignored or treated as a noise source. In this work, we attempt to model the time-variant effects and obtain a simple (periodically) time-varying [(P)TV)] electrical circuit model with (P)TV parameters from experimental in...
TC4 Symposium 2013
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Qinghai Shi, Olfa Kanoun
A new technique is proposed to locate wire faults and identify wire network topology using impedance spectroscopy (IS). The propagation along the cables is analytical, modelled with flexible multi section cascading features utilizing frequency dependent scattering parameters. Therefore, it doesn’t have the common numerical method problems. The transmission line model has the same spectrum as the measured reflection coefficient (ρ) of wire under test (WUT) so that same practical effects such as skin and proximity effects, signal loss, dispersion and frequency dependent signal propagation can...
TC4 Symposium 2013
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Henryk Urzedniczok
At present the modern sensors, based on the microelectronic, optoelectronic and bio-electronic technologies, are widely applied in various measuring systems. However, these sensors have often one essential disadvantage - wrong properties in metrological sense, mainly due to the poor selectivity and high sensitivity to the impact of the additional physical quantities. To apply such sensors in measuring transducers, for example in gas concentration transducers, effective methods of correction of these quantities influence are required. An effective numerical method based on model with variable...
TC4 Symposium 2013
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Michele Canepa, Andrea Mariscotti
The measurement of the magnetic field for the evaluation of human exposure is considered, addressing the requisites and specifications of a robust and reliable portable instrument, that outperforms existing products in some aspects related to on-site use, reliability and ruggedness. A rugged open instrument is the response to the exigency of deployment and use in hazardous environments with no risks for the assigned task and operators, as well as best exploitation of performance, interfacing it to a dedicated or a general purpose acquisition system.
TC4 Symposium 2013
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Predrag Petrovic
The paper presents a completely new realization of peak detector/full-wave rectifier of input sinusoidal signals, employing four CCCIIs (controlled current conveyors), metal-oxide-semiconductor transistors and single grounded capacitor, without any external resistors and components matching requirements. The circuit gives a DC output voltage that is the peak input voltage over a wide frequency range, with a very low ripple voltage and low harmonic distortion. The proposed circuits use an all-pass filter as a 90° phase shifter of the square value of the processed input signal. The proposed...
TC4 Symposium 2013
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Alexandre Lourenço, Raul Caballero Santos, Javier Diaz De Aguilar Rois
This paper describes a method to evaluate the low frequency level dependence of Planar Multijuction Thermal Converter (PMJTC) based on digital sampling. The measurement system, the algorithms and the validation are also described. This method is also valid to obtain the absolute value of the ac-dc difference of a thermal converter at low frequency.
TC4 Symposium 2013
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Luís Rosado, Pedro Ramos, Moisés Piedade
The use of pulsed stimulus on Eddy Currents Testing is currently applied on multiple applications from conductivity measurements to defects detection on metallic parts. This type of stimulus is frequency rich since it is composed by multiple harmonics and this allows testing with different depth concentration of the eddy currents as they are subject to the skin effect. In this paper, pulsed stimuli are used while testing with a custom probe. The probe output signals are acquired and processed digitally in the time domain using a simple feature, its RMS value. Two-dimensional scans were...
TC4 Symposium 2013
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Andrea Mariscotti, Attilio Marrese, Nicola Pasquino, Rosario Schiano lo Moriello
The propagation channel aboard trains is investigated with reference to the attenuation law governing propagation within cars, to the frequency response and impulse response for both horizontal and vertical polarization, and to the delay spread. Results show that the path loss exponent is slighlty smaller than in free space, possibly due to reflections by metal walls, and that it does not depend significantly on the position of transmitter and receiver. Also, the average value of the delay spread changes with polarization, proving that the latter impacts the channel’s statistical properties....
TC4 Symposium 2013
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Aleksandar Nikolic, Blagoje Babic, Aleksandar Zigic, Nikola Miladinovic, Srdjan Milosavljevic
Multi-channel system for remote power quality monitoring of distribution power stations in low and medium voltage supply networks is presented in the paper. The goal was to develop low-cost, space saving device that could simultaneously take measurements from all (usually eight or up to twelve) outgoing threephase feeders in distribution substation. In that case, we should perform at least 3 voltage measurements and 36 current measurements at the same time. In order to save space, but not to reduce the measurement accuracy, a data acquisition system is designed based on real-time...
TC4 Symposium 2013
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