A single antenna ambient noise cancellation method for in-situ radiated EMI measurements in the time-domain

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

doi:10.1109/emceurope.2016.7739185

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…Due to this, the emission signature of the system being tested can vary during measurement, making the frequency-swept measurement method unreliable. Moreover, when assessing emissions of atypical equipment in-situ, the signals and the radiofrequency noise in the environment add further uncertainty to measurements, making it even more relevant to consider the time-domain information as part of the emissions assessment [18]. Because of these reasons, it can be concluded that time-domain EMI measurement systems are well-suited for in-situ emissions assessment.…”

Section: Methodology a Measurement Systemmentioning

confidence: 99%

Strategies Using Time-Domain Measurements for Radiated Emissions Testing in Harsh Environments

Solé-Lloveras¹,

Azpúrua²,

Yoshioka³

et al. 2023

IEEE Open J. Instrum. Meas.

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Performing in-situ radiated emissions measurements, that is, in locations different from a standard test site, can be a challenging task because of the high electromagnetic noise levels in the ambient. A harsh electromagnetic environment characterizes such sites, and it usually results in difficulties when discerning between emissions from the equipment under test and electromagnetic fields generated by surrounding devices. Moreover, communications signals from broadcasting services are generally significantly higher than the standard emission limits making it even harder to determine compliance. In this paper, we present different techniques leveraging the advantages of time-domain measurement systems to provide effective and practical solutions to mitigate ambient noise's effect on radiated electromagnetic interference measurements. First, the test method used is described, and pragmatic considerations are given to ensure reliable and repeatable measurements. Multi-channel time-domain measurement systems are introduced as the fundamental tool for the proposed strategies. Subsequently, different study cases are evaluated with real test examples, highlighting several criteria intended to reduce the impact of ambient noise on the actual emissions measures produced by the equipment under test. Finally, a real application of those strategies for measuring a photovoltaic system is described. Overall, the methods employed and the main advantages of using full-time domain FFT-based receivers are reviewed. In addition, the possibility of incorporating this paper's outcomes into forthcoming electromagnetic standards about in-situ radiated emission measurements is also debated. Electromagnetic compatibility, in-situ testing, radiated emissions, time-domain measurements, standards, photovoltaic systems. INDEX TERMS

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Section: Methodology a Measurement Systemmentioning

confidence: 99%

Strategies Using Time-Domain Measurements for Radiated Emissions Testing in Harsh Environments

Solé-Lloveras¹,

Azpúrua²,

Yoshioka³

et al. 2023

IEEE Open J. Instrum. Meas.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Because of this, the emission signature of the system being tested can vary during measurement, making the frequency-swept measurement method unreliable. Moreover, when assessing emissions of atypical equipment in situ, the signals and the radiofrequency noise in the environment add further uncertainty to measurements making it even more relevant to consider the time-domain information as part of the emissions assessment [6]. Therefore, time-domain EMI measurement systems are well-suited for in situ emissions assessment.…”

Section: B Multi-channel Time-domain Emi Measurement Systemsmentioning

confidence: 99%

“…The main one is the uncontrollable conditions of the test site, as measurements may be performed within a non-clean and reflective electromagnetic environment. Detecting the disturbances produced by the equipment under test (EUT) can be challenging without shielding to attenuate signals and noise generated in the surroundings [3], [6]. Other challenges of in situ emissions assessments arise from the high number of measurement points/conditions that may imply lengthy and costly campaigns.…”

Section: Introductionmentioning

confidence: 99%

Efficient In situ Assessment of Radiated Emissions using Time-Domain Measurements

Solé-Lloveras,

Azpúrua,

Aragόn Homar

et al. 2023

2023 International Symposium on Electromagnetic Compatibility – EMC Europe

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This paper presents three different case studies where the electromagnetic emissions of atypical equipment (a photovoltaic system, a passenger boarding bridge and a pallet washing machine) have been assessed in situ using time-domain measurement systems. The magnetic field (150 kHz-30 MHz) and electric field (30 MHz-1 GHz) emissions are considered. The technical challenges encountered and the solutions adopted for each scenario will be highlighted by describing the methodology employed. The goal is to relate the empirical knowledge and know-how gained through those study cases with the specific requirements and procedures defined in the standards. In that sense, multi-channel time-domain emissions measurements have been essential to carry out those measurement campaigns efficiently. The results are summarised as lessons learned during the experiences reported in this article. This work is relevant to support the revision or development of standards about in situ EMC testing as it provides helpful evidence to validate alternative radiated emissions measurement methods under realistic conditions.

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The Analysis and Countermeasures of Mobile Terminal RE or RSE Problem

Kong

Chen

2019

Communications in Computer and Information Science

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A single antenna ambient noise cancellation method for in-situ radiated EMI measurements in the time-domain

Cited by 7 publications

References 10 publications

Strategies Using Time-Domain Measurements for Radiated Emissions Testing in Harsh Environments

Strategies Using Time-Domain Measurements for Radiated Emissions Testing in Harsh Environments

Efficient In situ Assessment of Radiated Emissions using Time-Domain Measurements

The Analysis and Countermeasures of Mobile Terminal RE or RSE Problem

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