The Anritsu MS610B spectrum analyzer is a wide band, high sensitive
receiver. It works on the principle of "super-heterodyne receiver" to convert higher frequencies (normally ranging
up to several 10s of GHz) to measurable quantities. The received frequency spectrum is slowly swept through
a range of pre-selected frequencies, converting the selected frequency to a measurable DC level (usually logarithmic
scale), and displaying the same on the CRT of the Anritsu MS610B. The CRT displays received signal strength
(y-axis) against frequency ( x-axis).