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IEEE Denver EMC – Virtual Presentation and Demo – FFT-Based Measurements

May 10 @ 10:00 AM - 11:30 AM MDT

Using FFT-based measurement systems for EMI testing can reduce time and improve the repeatability of EMI tests. With the availability of high-speed high resolution ADCs and large computation power today, FFT-based measurement systems exceed the performance of traditional EMI receivers especially in regards to noise floor, measurement speed, and accuracy. Today, a real-time analysis bandwidth up to 685 MHz for Quasi-Peak in full compliance mode is available, reducing the test time from 9 hours down to 3 seconds. Using the fast measurement speed for pre-scanning is another option that helps speed up the measurement. However, we see this only as an intermediate step towards full characterization of EUTs with Peak, Quasi-Peak and Average. Real-time Quasi Peak measurements allow directly characterizing all angular positions with Quasi-Peak. Using a FAR, the test is completed within less than 1 minute in the range from 30 MHz – 1 GHz. Real-time scanning is also possible above 1GHz further increasing test speeds. For the SAC, the measurement of all angular positions as well as the height scan can be performed much more quickly than a traditional receiver, reducing that test’s time from hours down to minutes. During the presentation the technological and mathematical background for FFT-based measurement according to CISPR 16-1-1 and MIL461 will explained. These are critical as CISPR 16-1-1 and MIL461G discuss the implementation as well as the equivalence to a traditional EMI receiver ensure traceability and the same test results. This allows for FFT-based measurements to not only be faster than traditional measurements, but also still compliant. Additionally, we will cover the differences between an FFT-analyzer, a Real-time spectrum analyzer, and the FFT-based measurement system. Finally, some pitfalls of using Scopes with FFT-mode or Real-time Spectrum Analyzers for EMI testing will be explained. Presentation will include a live (via-WebEx) demonstration of an FFT-based measurement to highlight the speed and capabilities of such a system. Co-sponsored by: Dr. Stephan Braun; Managing Director – Gauss Instruments Speaker(s): Dr. Stephan Braun, Agenda: 10:00-10:15 AM – Welcome Message, Chapter News, Local Chatter 10:15-11:30 AM – Presentation by Dr. Stephan Braun & Q&A 11:30 AM – Closing Remarks Denver, Colorado, United States, Virtual: https://events.vtools.ieee.org/m/311795

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