Fast Magnetic Emission Tests for Continuous Measurements Around an Equipment Under Test

Hartman, Tom; Moonen, Niek; Have, Bas ten; Leferink, Frank

doi:10.23919/aeroemc.2019.8788950

Cited by 7 publications

(13 citation statements)

References 9 publications

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“…Using the TD technique described in [6] allows to measure the whole spectrum within a single dwell time provided by Table I. To obtain a measurement result that will be close to the FD measurement results, the antenna movement speed must be at most…”

Section: A Uniform Motion Methodsmentioning

confidence: 99%

“…The setup presented in this section is based on the TD measurement technique described in [6]. The significant improvements with respect to the standard FD measurements create a strong base to the further improvements discussed in Section III.…”

Section: Measurement Setupmentioning

confidence: 99%

“…To decrease this underestimation, time domain (TD) measurements are gaining popularity [5]. According to [6], since with TD measurement all frequency components are measured at the same time, the speed of measurement is significantly increased without a sacrifice in accuracy compared to FD methods [7], [8]. The advantages and disadvantages of TDEMI analysers have been discussed in [9] and [10].…”

Section: Introductionmentioning

confidence: 99%

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Continuous Electromagnetic Emission Measurement Setup with Antenna Position Tracking

Pokotilov

Vogt-Ardatjew

Hartman

et al. 2020

2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE

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ZAbstract -For measuring the maximum electromagnetic emissions around equipment many test methods use the frequency domain, traditionally using a super-heterodyne test receiver. However, for large equipment under test the frequency domain method is very time consuming when the measurements are performed at low frequencies, below 150 kHz, where small bandwidth and thus long measurement time is needed. Timedomain measurements are now replacing the traditional superheterodyne receivers, but the commercial time-domain receivers still use a first mixer stage. However, at low frequencies, low cost digitisers can do the same job directly in the baseband. Using fast signal processing, this method allows to continuously measure the radiated magnetic field around the equipment under test. Combined with position tracking, this allows to identify areas of maximum emissions very fast. These positions are then used to obtain a more detailed spectral analysis of emissions by increasing the measurement time over those spots. In result, the whole measurement procedure can be significantly optimized by spending less time over areas of lower interest, and putting more focus on areas of potentially high emission levels. This paper presents the concept as well as an experimental comparison of three antenna movement approaches satisfying the NRE01 and RE101 radiated emissions measurement procedures.

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Section: A Uniform Motion Methodsmentioning

confidence: 99%

Section: Measurement Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Continuous Electromagnetic Emission Measurement Setup with Antenna Position Tracking

Pokotilov

Vogt-Ardatjew

Hartman

et al. 2020

2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE

Self Cite

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“…A lot of measurement steps and a minimum amount of measurement time per frequency bin result in a very long and detrimental measurement time, as has been shown in [5]. Additionally, having to do these measurements at many different positions around a large equipment under test (EUT) increases the total measurement time even more, for some systems this can even be as long as one week, resulting in very high costs [6]. To reduce these long and therefore expensive measurement times time-domain EMI analyzers became very popular, but remain expensive.…”

Section: Introductionmentioning

confidence: 99%

Time-Domain EMI Measurements using a Low Cost Digitizer to Optimize the Total Measurement Time for a Test Receiver

Hartman

Grootjans

Moonen

et al. 2020

2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE

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By analyzing electromagnetic interference (EMI) based on its spectral components important time-domain information is lost. Conventional super-heterodyne frequency band stepping EMI test receivers have to use long dwell times for every frequency which makes the total measurement time too long. Often dwell times are set too short, causing time-varying interference, or cyclo-stationary interference, to be detected improperly. The concept of time-varying EMI is also not incorporated in standards, which are only based on frequency domain limits. To catch these time-varying interferences the receiver has to measure for at least one repetition period. Measuring many spectral components for at least the repetition of a cyclo-stationary signal causes detrimental measurement times. Time-domain electromagnetic interference (EMI) analyzers have been proposed to reduce these long measurement times, but remain expensive. To reduce costs the utilization of time-domain EMI measurements using a low cost digitizer is examined. A PicosScope in conjunction with Digital Signal Processing (DSP) is used to create the possibility to estimate the total measurement time of a conventional EMI receiver based on the dwell times. This can be used to optimize the total measurement time needed for the test receiver, while still complying to standards, resulting in reduced measurement times otherwise needed in expensive test labs. A short-time Fast-Fourier transform (STFFT) is used to examine the interfering source in both frequency and time simultaneously. It was also shown that the conventional EMI receiver perceives certain time varying signals as continuous waves due to the spectral nature of this receiver.

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“…The results presented show that also for magnetic fields, the generated EMI can be tuned by choosing different combinations of modulation and carrier frequency. Further development of the measurement technique will allow a more accurate assessment of highly radiative or suppressed frequencies in the system under test, first steps where taken in this endeavor in [34,35].…”

Section: Magnetic Field Strength Resultsmentioning

confidence: 99%

Noise Control in Novel Power Electronics for Smart Grid

Moonen¹

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Fast Magnetic Emission Tests for Continuous Measurements Around an Equipment Under Test

Cited by 7 publications

References 9 publications

Continuous Electromagnetic Emission Measurement Setup with Antenna Position Tracking

Continuous Electromagnetic Emission Measurement Setup with Antenna Position Tracking

Time-Domain EMI Measurements using a Low Cost Digitizer to Optimize the Total Measurement Time for a Test Receiver

Noise Control in Novel Power Electronics for Smart Grid

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