The pains he went to to get the spectrum analyzer working, including a deep dive into FFT, are impressive. The results speak for themselves on this one, and hats off to [Rodmg] for the effort and ...

Yokogawa Test & Measurement's AQ6377E optical spectrum analyzer offers fast, precision mid-wave infrared (MWIR) measurements ...

For example, whereas an oscilloscope would show total noise level, a spectrum analyzer would show the noise as related to frequency. Available in both analog and digital models, digital analyzers ...