This is an advanced spectral analyzer destined for research and development purposes as well as for other applications with exacting demands on measurement accuracy in a broad range of frequencies from tens of Hz to units of GHz. The uniqueness of this analyzer consists in the parameters attained in the required frequency spectrum, in particular in the high dynamic measuring range at high guaranteed accuracy of both voltage and frequency measurements, which is predetermined by the high noise immunity of electronic elements used in the signal part of the instrument.