Dynamic Performance Evaluation of Full Time Domain EMI Measurement Systems

Abstract

This paper presents the evaluation of the performance of Full Time Domain Electromagnetic Interference measurement systems in terms of the noise figure, the linearity, the dynamic range, the voltage standing wave ratio and the crosstalk. The abovementioned parameters allow a broader characterization of the oscilloscope-based implementations of CISPR 16-1-1 measuring receivers, providing relevant specifications that are beyond the standardized baseline requirements. Such metrics are assessed using the actual settings and operating conditions required for compliant time-domain EMI measurements. For the specific oscilloscope used in the experiments, the noise figure is measured for all the different vertical ranges between 5 mV/div and 1 V/div. Likewise, the linearity and the dynamic range, in terms of the effective number of bits, was measured for sine wave input signals with an rms voltage swept between 20 mV and 1 V. This experiment was repeated for CISPR bands A, B and C/D using 10 kHz, 1 MHz, and 100 MHz sinusoids, respectively. The results allow a more comprehensive comparison between Full-TDEMI measurement systems and the more conventional superheterodyne architecture receivers that are completely specified in the frequency domain.

Time-Domain Electromagnetic Characterization of Reaction Wheel for Space Applications

“…Multidomain means EMI measurements are processed and analyzed in time, frequency, and statistical domains, either independently or simultaneously. This allows for accurate spectral estimations according to standard specification [11], [13], [14] and complementary analysis, including waveform measurements, spectrograms, waterfall/persistence plots, and probabilistic information about the interference, e.g., the amplitude probability distribution (APD). Moreover, multichannel means the measurement system has more than one input.…”

Metrological Characterization of EMI Receivers

“…The TD EMI receivers work on the principle of a fast A/D converter which is directly at the receiver's input (sometimes after an attenuator or filter) so that no local oscillator is needed and the whole spectrum of the input signal is computed at once. There exist several architectures of TD EMI receivers, such as multiresolution systems for enhancing dynamic range based on field programmable gate arrays (FPGA) [7], commercial systems based on multichannel oscilloscopes digitizing the signal without frequency conversion to IF (see, e.g., [8], [9] for frequencies below 1 GHz). A system capable of measuring up to 18 GHz was presented e.g.…”

Simulink-Based FPGA Control for EMI Investigations of Power Electronic Systems

“…Results have been processed using an short-time fast Fourier transform (STFFT) incorporating a peak detection similar as was shown in [32]. Possible benefits of using a oscilloscope have been shown [32]- [34], whereas the applicability for full-time domain-based EMI measurements according to CISPR-16-1-1 were shown in [35]. Fig.…”