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Real-time spectrum analysis for EMI diagnostics

Posted: 18 Jul 2008     Print Version  Bookmark and Share

Keywords:EMI  filtering methods  spectrum analysers  real-time analysis 

This application note briefly examines the different stages of design and test with respect to test equipment and measurement techniques.

This document reviews the currently specified detection and filtering methods, and provides a quick reference to the specified measurement bands and their associated filters and detectors.

Making EMI standards-based measurements requires special filters and detectors as defined by standards bodies. These special filters and detectors are available in receivers, conventional spectrum analysers and Tektronix Real-Time Spectrum Analysers (RTSAs). DSP techniques used in RTSAs and some receivers can make measurements of magnitudes faster than swept methods, because an entire real-time span (up to 110MHz) can be analysed simultaneously.

Real-time analysis greatly reduces the minimum signal duration required to guarantee 100 per cent probability of intercept of transients compared to swept techniques. Troubleshooting systems that create a broad variety of transient signals can be most easily performed with a RTSA that has DPX spectrum processing, ensuring that no transient is missed during the analysis. This improves time to insight and creates higher confidence in the quality of the device under test.

View the PDF document for more information.

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