Advances in Radio Science www.adv-radio-sci.net 1684-9965 1684-9973 6 Kleinheubacher Berichte 2007 2008 10.5194/ars-6-311-2008 http://www.adv-radio-sci.net/6/311/2008/ http://www.adv-radio-sci.net/6/311/2008/ars-6-311-2008.html http://www.adv-radio-sci.net/6/311/2008/ars-6-311-2008.pdf 311 313 2008-05-26 Measurement of electromagnetic interference in time-domain S. Braun A. Frech P. Russer Lehrstuhl für Hochfrequenztechnik, Arcisstraße 21, 80333 München, Germany Time-domain EMI measurement systems allow measurement time to be reduced by several orders of magnitude. In this paper a novel real-time operating time-domain EMI measurement system is presented. By the use of several analog-to-digital converters the dynamic range requested by the international EMC standards is achieved. A real-time operating digital signal processing unit is presented. The frequency band that is investigated is subdivided into several sub-bands. A novel implementation of the 9 kHz IF filter for the frequency 150 kHz to 1 GHz is presented. By this way the measurement time has been reduced by a factor of 8000 in comparison to conventional EMI receivers. During emission measurements performed with a modelled IF-bandwidth of 9 kHz the noise floor is decreased to −19 dBµV in the average detector mode by the implemented low noise power splitter. Measurements have been performed with the improved measurement system in the frequency range 30 MHz–1 GHz. Braun, S. and Russer, P.: A Low-Noise Multiresolution High-Dynamic Ultra-Broad-Band Time-Domain EMI Measurement System, IEEE Transactions on Microwave Theory and Techniques, 53, 3354–3363, 2005. Braun, S., Krug, F., and Russer, P.: A Novel Automatic Digital Quasi-Peak Detector for a Time Domain Measurement System, in: 2004 IEEE International Symposium On Electromagnetic Compatibility Digest, August 9–14, Santa Clara, USA, vol 3, pp. 919–924, 2004. Braun, S., Aidam, M., and Russer, P.: Development of a Multiresolution Time-Domain EMI Measurement System that Fulfils CISPR 16-1, in: 2005 IEEE International Symposium On Electromagnetic Compatibility, Chicago, USA, pp. 388–393, 2005. Braun, S., Al-Qedra, M., and Russer, P.: A novel Realtime Time-domain EMI Measurement System based on Field Programmable Gate Arrays, in: 17th International Zurich Symposium on Electromagnetic Compatibility, Digest, pp. 501–504, Singapore, 2006. CISPR~16-1-1: Specification for radio disturbance and immunity measuring apparatus and methods Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring apparatus, International Electrotechnical Commission, 2006. DaimlerChrysler: Joint Engineering Standard DC-11223, DaimlerChrysler, 2006. General Motors Engineering Standards: General Specification for Electrical/Electronic Components and Subsystems, Electromagnetic Compatibility, GMW3097, GM, 2006. Meinke, F. and Gundlach, H.: Taschenbuch der Hochfrequenztechnik, ISBN~3-540-15393-4, Springer Verlag, 1986. Rohde & Schwarz: Ultra Broadband Antenna HL562 ULTRALOG, Data sheet, 2001.