Beyond Traditional Spectrum Analysis
Agilent
Traditional spectrum analyzers are measuring devices of a scalar nature whose main screen shows the representation of a scalar value (the amplitude of the signal) with respect to frequency. The most common measurements are the signal power and the frequency of spectral components such as harmonics, intermodulation and spurious components. Power versus frequency values can be integrated or corrected within the resolution bandwidth (BRW) to obtain noise power (and phase noise), in-band power, adjacent channel power, and bandwidth. band busy. 
