Abstract
Abstract. In this paper, a broadband time-domain EMI measurement system for measurements from 9 kHz to 18 GHz is presented that allows for compliant EMI measurements in CISPR Band E. Combining ultra-fast analog-to-digital-conversion and real-time digital signal processing on a field-programmable-gate-array (FPGA) with ultra-broadband multi-stage down-conversion, scan times can be reduced by several orders of magnitude in comparison to a traditional heterodyne EMI-receiver. The ultra-low system noise floor of 6–8 dB and the real-time spectrogram allow for the characterisation of the time-behaviour of EMI near the noise floor. EMI measurements of electronic consumer devices and electric household appliances are presented.
Highlights
Electromagnetic interference (EMI) and electromagnetic compatibility (EMC) are traditionally measured on heterodyne EMI-receivers (Hagenhaus, 1942)
After broadband sampling of the EMI signal, the spectrum is calculated via the Fast-FourierTransform (FFT) and detectors are applied digitally
The presented time-domain EMI measurement system allows for the CISPR-compliant measurement of EMI in CISPR Band E up to 18 GHz
Summary
Electromagnetic interference (EMI) and electromagnetic compatibility (EMC) are traditionally measured on heterodyne EMI-receivers (Hagenhaus, 1942). The sequential measurement of typically several thousand frequencies yields long scan times on the order of hours or even days. Timedomain measurement systems can reduce scan times by several orders of magnitude. An EMI measurement over the complete band from 9 kHz to 18 GHz with an IF-bandwidth of 9 kHz takes less than 3 min. Using a traditional EMI-receiver with a dwell-time of 100 ms, the measurement of roughly 2 × 106 frequency points would take over 55 h. The presented time-domain EMI measurement system allows for the CISPR-compliant measurement of EMI in CISPR Band E up to 18 GHz. The real-time capability permits the characterisation of the time-behaviour of a device’s emission. Spectrogram measurements of the data transmission between two modern smartphones and the nonstationary radiated emission of a microwave oven are shown
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