A Proposed Method for Quantifying Uncertainty in Rf Immunity Testing Due to Eut Presence

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Abstract-The rigorous uncertainty estimation in Electromagnetic Compatibility (EMC) testing is a complex task that has been addressed through a simplified approach that typically assumes that all the contributions are uncorrelated and symmetric, and combine them in a linear or linearized model using the error propagation law. These assumptions may affect the reliability of test results, and therefore, it is advisable to use alternative methods, such as Monte Carlo Method (MCM), for the calculation and validation of measurement uncertainty. This paper presents the results of the estimation of uncertainty for some of the most common EMC tests, such as: the measurement of radiated and conducted emissions according to CISPR 22 and radiated (IEC 61000-4-3) and conducted (IEC 61000-4-6) immunity, using both the conventional techniques of the Guide to the Expression of Uncertainty in Measurement (GUM) and the Monte Carlo Method. The results show no significant differences between the uncertainty estimated using the aforementioned methods, and it was observed that the GUM uncertainty framework slightly overestimates the overall uncertainty for the cases evaluated here. Although the GUM Uncertainty Framework proves to be adequate for the particular EMC tests that were considered, generally the Monte Carlo Method has features that avoid the assumptions and the limitations of the GUM Uncertainty Framework.

Section: Radiated Immunity According Iec 61000-4-3mentioning

confidence: 99%

Section: Conducted Emissions According Cispr 22mentioning

confidence: 99%

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Comparison of the Gum and Monte Carlo Methods for the Uncertainty Estimation in Electromagnetic Compatibility Testing

Azpúrua¹,

Tremola²,

Barrios³

2011

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“…The Monte Carlo Method (MCM) is recognized as a practical alternative by the Joint Committee for Guides in Metrology (JCGM) of the Bureau International des Poids et Mesures (BIPM), and it has been included in the GUM as a supplement, since 2008 [12]. It has been widely used within many scientific disciplines, such as metrology, geodesy, optics, hydrology, electronics, structural mechanics and electromagnetic compatibility, among others [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Uncertainty Estimation in Complex Permittivity Measurements by Shielded Dielectric Resonator Technique Using the Monte Carlo Method

Páez¹,

Azpúrua²,

Tremola³

et al. 2012

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In this paper, we estimate the uncertainty in complex permittivity measurements performed in a shielded dielectric resonator, by using the Monte Carlo Method. We selected this approach since the theoretical expressions required to interpret the experimental results are highly non-linear. Furthermore the resonant frequency of the system and its quality factor are highly correlated. Thus we propose a model for the measurement process which considers the major sources of uncertainty previously reported in published experimental results. The proposed model combined with the Monte Carlo method was used to propagate the probability distributions of each uncertainty contribution, obtaining a) the approximate probability density function for the measured complex permittivity, and b) the estimated expanded uncertainty for the mode TE 011 . The results show that this procedure leads to small uncertainty intervals for the real part of the dielectric permittivity, while it is not very reliable in the loss tangent measurement. Additionally, for each input quantity, we calculated the standard deviation in the experimental results produced independently by each uncertainty contribution.

“…The mutual coupling affects the E-field measurements especially when using hybrid antennas of large size [18].…”

Section: Requirements and Conditionsmentioning

confidence: 99%

An Interpolation Method to Calibrate Electromagnetic Probes in Semi-Anechoic Chambers

Tremola¹,

Azpúrua²,

Páez³

et al. 2012

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Abstract-Based upon the standard IEEE 1309, a new calibration method for electromagnetic (EM) probes is proposed. The aforementioned method compares the electric field strength measured with the EM probe subject to calibration with the E-field intensity calculated through a linear interpolation of the corrected measurement using a reference EM probe. The corrected measurement results are computed by means of the calibration factors stated in the calibration certificate of the reference EM probe. The conditions and criteria, under which it is possible to calibrate EM probes inside semi-anechoic chambers in the frequency range of 80 MHz to 1 GHz, are presented. The results shows that the calibration method proposed in this paper is characterized by deviations less than 1 dB in almost all the frequencies considered, verifying the reliability of the method. The proposed approach is very useful for registering the measurement drift of EM probes used in EMC testing laboratories.