Dr. Stephan Braun of Gauss Instruments International GmbH

Using the FFT-based measurement systems for EMI testing can reduce test time and improve the repeatability of EMI tests. With the availability of high speed - high resolution ADCs and the large computation power today, FFT-based measurement systems exceed the performance of traditional EMI receivers, regarding 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 an option that allows speeding up the measurement. However, we see this only as an intermediate step towards full characterization of EUTs with Peak, Quasi-Peak and Average detection. Real-time Quasi Peak measurements allow for 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. Above 1 GHz real-time scanning allows to speed up the testing in a similar way. For the SAC measurements the measurement of all angular positions as well as the height scan can be performed very fast reducing the test time from hours down to minutes. During the presentation, the technological and mathematical background FFT-based measurement according to CISPR 16-1-1 and MIL461 is explained. The requirements of CISPR 16-1-1 and MIL461G regarding the implementation as well as the equivalence to a traditional EMI receiver ensure traceability and the same test results. The difference between an FFT-analyzer, a Real-time spectrum analyzer and the FFT-based measurement system are explained. Some pitfalls of using Scopes with FFT-mode or Real-time Spectrum Analyzers for EMI testing are explained.

Biography:

Stephan Braun studied Electrical Engineering at Munich University of Technology (TUM), and received his Dipl.-Ing. Degree in 2003. From 2003-2009 he was Research Assistant at the Institute for High frequency engineering, where he received in 2007 his Dr.-Ing. Degree. During this time the research was focused on the Theory and Application of Full Compliant EMI Testing using Time-domain (FFT-based) Methods. He has worked actively since 2007 for DKE and CISPR and has contributed to the inclusion and definition of the FFT-based measuring instrument according to CISPR 16-1-1, CISPR 16-3 and CISPR 16-2-X. In 2010 this novel method became standard and is today referenced by almost all EMI Testing standards, including MIL461G. Dr. Braun is co-founder and managing director of GAUSS INSTRUMENTS International. He is a member of VDE, Electrosuisse and IEEE. Dr. Braun supports the IEEE Continued Education Program - German Chapter and well as the IEEE EMC Bootcamp. He is author of more than 100 papers and is the inventor of several patents, mainly about EMI testing, real-time signal processing and microwave circuits.

Address:Messerschmittstr. 4, , Munich, Germany, 80992