Agilent / HP 85685A Description:
This Analyzer 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 Agilent 85685A.
The CRT displays received signal strength (y axis) against frequency (x axis).
Some applications for Agilent 85685A Spectrum Analyzers include Site monitoring Verify that the frequency and signal strength of your transmitter is accurate.
Interference before a system is installed you use a Agilent 85685A spectrum analyzer to verify that the frequencies are not occupied or if the presence of a very strong signal will interfere with your new setup.
Interference can be created by a number of different situations.