Signal processing strategies with the tdemi measurement system

Krug, F.; Hermann, T.; Russer, P.

doi:10.1109/imtc.2003.1208272

Cited by 17 publications

(11 citation statements)

References 5 publications

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“…One of the first systems where based on a digital storage oscilloscope and used the fast Fourier transform as presented by C. Keller [5]. An algorithm that allows measurements in the peak, average and rms detector modes to be simulated has been presented in [6]. An algorithm for the quasi-peak detector mode has been presented in [7].…”

Section: Introductionmentioning

confidence: 99%

Spectrum analysis and EMI measurements based on time-domain methods

Braun¹

2010

15th Conference on Microwave Techniques COMITE 2010

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Measurements of electromagnetic interference in time-domain allow to reduce the scan time by several orders of magnitude, in comparison to automated scans performed by the tuned selective voltmeters, which are known as EMI receivers. Spectrum analyzer are used for frequency selective measurements of signals. Such analyzers can perform fast sweeps or scans over large bands. A drawback of spectrum analyzers is the long sweep time, when a high frequency resolution is required.In this paper an overview of methods and systems is shown which perform the measurement in time-domain and use the short-time fast Fourier transform for the calculation of the spectrum rather than a sequential measurement. Baseband systems allow to speed up scans by several orders of magnitude. Systems with a broadband downconversion and a broadband analog-to-digital converter system allow to extend the frequency range beyond the Nyquist frequency of todays availabe ADCs. Powerful Short-time fast Fourier transform processors allow to process several frequencies at the same time. A gapless processing allows to analyze unstationary signals as well as small narrowband signals.

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Section: Introductionmentioning

confidence: 99%

Spectrum analysis and EMI measurements based on time-domain methods

Braun¹

2010

15th Conference on Microwave Techniques COMITE 2010

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“…It consists of a low-noise amplifier, an anti-aliasing lowpass filter, an oscilloscope for data acquisition and a PC for digital signal processing. An algorithm for recording in time-domain and evaluation of EMI spectra in the Peak, Average and RMS detector modes is presented in [2]. An algorithm for the evaluation of EMI spectra in the quasi-peak detector mode has been presented in [1].…”

Section: Time-domain Emi Measurement Systemmentioning

confidence: 99%

“…Triggered data acquisition has already been presented in [2]. In the following a routine is described to reduce the number of required pulses.…”

Section: ) Measurement Of Time Intervals Between Pulsesmentioning

confidence: 99%

“…Thus the resulting Electric field E r (t) given by (2) where E s k (t) is the Electric Field strength of the source k. h k (t) is the time domain response of the path form the device to the receiving antenna.…”

Section: A Linear Superpositionmentioning

confidence: 99%

“…In the last chapter we have seen that the superposition of all electric fields can be calculated according to (2). In this chapter an algorithm is presented that allows to generate a statistical equivalent signal.…”

Section: B Merging To One Signalmentioning

confidence: 99%

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Predicted radiated emissions of systems according to the EMC standards with a time-domain EMI measurement system

Braun¹,

Russer²

Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.

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Measurements for full compliance tests according to the EMC standards FCC, CISPR and MIL have to be performed with EMI-Receivers that must show the behavior as given in the standards. In order to predict the electromagnetic interference of a system field simulations are performed in frequency-and time-domain. Today complex systems like computer mainboards or automotive systems consist of various components that show a emission that could be described by statistical models. We have presented a Time-domain EMI (TDEMI) Measurement System that observes the input signal and generates a statistical model. This model is used to obtain a spectrum that can be evaluated under the various detector modes of an EMI Receiver. The TDEMI System reduces the measurement time by about a factor of 50.In this paper it is shown that the Time-domain EMI Measurement system allows to predict electromagnetic interference of a system consisting of several characterized components. A statistical model of the emission of each source and a model of coupling is used to obtain a statistical model that describes the complete system. The statistical model of the emission of a single source can be obtained by measurements or system level simulations. The coupling model is obtained by field solving tools. The resulting statistical model of the complete system is used to obtain a spectrum that can be evaluated under peak, quasi-peak, average and rms detector. Measurements have been performed with drill machine and a laptop as an example of a system consisting of two sources in the frequency range 30 MHz-1 GHz.

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Modelling and measurement of high‐frequency conducted electromagnetic interference in DC–DC converters

Grobler

Gitau

2017

IET Science, Measurement & Technology

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Abstract-Conducted EMC noise qualification tests are normally carried out after a prototype has been designed, built and tested and the process is repeated in the event of non-compliance. The ability to determine compliance with EMI standards at the design stage is therefore desirable. This paper will present conducted EMC noise modelling and measurement techniques, yielding simulated and measurement noise results accurate enough to serve as a prequalification test at the design and prototyping stages respectively.Accurate models of the power feed-line connecting the LISN to the DUT (converter), including the load are developed. Predictive conducted EMC modelling is accomplished using detailed active level 3 SPICE-based models, creating a real-time circuit model consisting of a complete converter in its operational state, without the need to separate into equivalent models. Effects of the power feed-line length on EMI noise measurements are investigated as currently available literature has not dealt adequately with this issue. To detect possible radiating frequencies that might emerge with the conducted noise and are detectable in the conducted emission test, results have to be accurate not just in the prescribed frequency band, but all the way up to 100 MHz. The modelling and measurements are performed using software and instruments available in a development laboratory.

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Signal processing strategies with the tdemi measurement system

Cited by 17 publications

References 5 publications

Spectrum analysis and EMI measurements based on time-domain methods

Spectrum analysis and EMI measurements based on time-domain methods

Predicted radiated emissions of systems according to the EMC standards with a time-domain EMI measurement system

Modelling and measurement of high‐frequency conducted electromagnetic interference in DC–DC converters

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