The R&S FSL spectrum analyzer is an extremely lightweight and compact analyzer, suitable for use in a wide range of applications in development, maintenance, and production. Despite its small size, it provides a large number of functions that only instruments have, thus having excellent cost-effectiveness. The R&S FSL spectrum analyzer is an instrument with a tracking source of up to 6GHz, which can perform I/O demodulation on signals with a bandwidth of 28MHz. In addition, the operating frequency range of the R&S FSL spectrum analyzer can reach 18GHz, suitable for the microwave frequency band.