For many people spectrum analysis seems to be a kind of 'secret lore', mastered only by afew specialists. One could gain this impression when reading the available literature on this topic. Integrals, differential calculus and scientific papers as far as the eye can see. Practical focused Engineers however are primarily interested in answering two questions: "How does it work and how can I use it?"

Taking measurements with a spectrum analyser is as easy as working with an oscilloscope. Properly used, applications of the spectrum analyser are manifold in research and development, test facility, service and EMC diagnostics. Spectrum analysers can display signals up to very high frequencies. Due to the superhet receiver principle, the logarithmic analysis and display of data, the spectrum analyser has a thousandfold higher sensitivity and a higher dynamic range (› 80dB) compared to an oscilloscope.

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