A measurement system for radiated transient electromagnetic interference based on general purpose instruments

Azpúrua, Marco A.; Pous, Marc; Silva, Ferran

doi:10.1109/isemc.2015.7256338

Cited by 26 publications

(19 citation statements)

References 15 publications

(16 reference statements)

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“…The DPO5104B has a 1-GHz bandwidth, a maximum sampling rate of 10 GSamples/s, 50 MSamples of memory depth, and its nominal input impedance can be set to 50 . This measurement system is more suited for radiated EMI measurement, and thus it was assessed in CISPR bands C and D. In practice, it may require additional external preamplification for increasing the sensitivity of the measurement system [12].…”

Section: Resultsmentioning

confidence: 99%

“…In general terms, a full TDEMI measurement system is described by the block diagram shown in Fig. 2 [12], [13]. For the measurement of radiated EMI, a broadband antenna shall be used, while for the measurement of conducted EMI corresponds either a current clamp or a line impedance stabilization network.…”

Section: B Full Time-domain Emi Measurement Systemsmentioning

confidence: 99%

“…Welch's method for spectral estimation is used as explained in [12] and [21]. An appropriate windowing function for providing a suitable RBW must be selected, e.g., the Gaussian or the Kaiser-Bessel functions [13].…”

Section: A Sine-wave Measuresmentioning

confidence: 99%

See 2 more Smart Citations

Waveform Approach for Assessing Conformity of CISPR 16-1-1 Measuring Receivers

Azpúrua

Pous

Oliva

et al. 2018

IEEE Trans. Instrum. Meas.

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Abstract-An alternative approach for assessing the conformity of electromagnetic interference measuring receivers with respect to the baseline CISPR 16-1-1 requirements is proposed. The method's core is based on the generation of digitally synthesized complex waveforms comprising multisine excitation signals and modulated pulses. The superposition of multiple narrowband reference signals populating the standard frequency bands allows for a single-stage evaluation of the receiver's voltage accuracy and frequency selectivity. Moreover, characterizing the response of the weighting detectors using modulated pulses is more repeatable and less restrictive than the conventional approach. This methodology significantly reduces the amount of time required to complete the verification of the receiver's baseline magnitudes, because time-domain measurements enable a broadband assessment while the typical calibration methodology follows the time-consuming narrow band frequency sweep scheme. Since the reference signals are generated using arbitrary waveform generators, they can be easily reproduced from a standard numerical vector. For different test receivers, the results of such assessment are presented in the 9 kHz-1 GHz frequency range. Finally, a discussion on the measurement uncertainty of this methodology for assessing measuring receivers is given.

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Section: Resultsmentioning

confidence: 99%

Section: B Full Time-domain Emi Measurement Systemsmentioning

confidence: 99%

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Waveform Approach for Assessing Conformity of CISPR 16-1-1 Measuring Receivers

Azpúrua

Pous

Oliva

et al. 2018

IEEE Trans. Instrum. Meas.

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“…3. The spectral estimation has been calculated using the Welch's periodogram and the processing techniques explained in [4] and [6]. The narrow band signal EMI cw1 at approximately 250 kHz corresponds to the AM broadcasting.…”

Section: A Decomposition Of a Synthesized Emimentioning

confidence: 99%

“…Consequently, in some cases, the standardized methods of EMI measurement and evaluation are not completely suitable, insufficient or might require an enormous amount of time to provide reliable measurement results [3], [4]. Currently, the fast Fourier transform-based EMI test receivers and real-time spectrum analyzers have time-scan measurement capabilities that overcome many of the limitations of the stepped frequency scan in the EMI receivers.…”

mentioning

confidence: 99%

Decomposition of Electromagnetic Interferences in the Time-Domain

Azpúrua

Pous

Silva

2016

IEEE Trans. Electromagn. Compat.

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Abstract-Electromagnetic interferences are potentially very complex signals formed by the superposition of transient (broadband) and continuous wave (narrowband) components with significant randomness in both amplitude and phase. Decomposing the electromagnetic interference measured in the time domain into a set of intrinsic mode functions is useful to gain insights of the process that generates the interference. Evaluating the intrinsic mode functions contributes to improving the measurement capabilities of the time-domain electromagnetic emissions measurement systems based on the general-purpose oscilloscopes. In this paper, a combination of techniques that includes empirical mode decomposition and transient mode decomposition is used to separate the main components of complex electromagnetic disturbances. This approach requires no prior information on the spectral content of the measured EMI and it does not perform a domain transformation. Examples of electromagnetic interference decomposition verify the effectiveness and the accuracy of the proposed approach. Finally, a discussion on the advantages, practical applications, limitations, and drawbacks of the described techniques is addressed.Index Terms-Digital signal processing, electromagnetic compatibility, electromagnetic interference, electromagnetic measurements, time-domain analysis.

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Impact of short-time fourier transform parameters on the accuracy of EMI spectra estimates in the 2-150 kHz supraharmonic interval

Sandrolini

Mariscotti

2021

Electric Power Systems Research

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Methods based on time-domain sampling and successive tapering and Fourier analysis, used in the "harmonics" frequency interval up to 2.4 kHz, cannot be automatically extended to the 2-150 kHz interval, in particular considering the emissions of Switched-Mode Power Supplies (SMPSs) in a modern smart grid or low-voltage distribution scenario. Emissions are substantially impulsive and oscillatory superposed to the mains signal, possibly featuring multiple switching fundamentals and their harmonics with unstable or purposely changing fundamental frequency. Fourier analysis (namely Discrete Fourier Transform) is commonly used to characterize the spectrum of emissions from time-domain data, but the influence of its settings should be verified for accuracy and systematic errors, so to establish the uncertainty of spectral estimates. After an initial theoretical and practical discussion of characteristics, objectives and weak points, a verification is carried out with the help of several measurements performed in different operating conditions on a set of six different SMPSs, evaluating systematic error and uncertainty, and defining a set of recommendations.

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A measurement system for radiated transient electromagnetic interference based on general purpose instruments

Cited by 26 publications

References 15 publications

Waveform Approach for Assessing Conformity of CISPR 16-1-1 Measuring Receivers

Waveform Approach for Assessing Conformity of CISPR 16-1-1 Measuring Receivers

Decomposition of Electromagnetic Interferences in the Time-Domain

Impact of short-time fourier transform parameters on the accuracy of EMI spectra estimates in the 2-150 kHz supraharmonic interval

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