Agilent / HP / Keysight 8561A
8561A 6.5 GHz RF Spectrum Analyzer
This Spectrum analyzer is a wide band, very 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.
The CRT displays received signal strength (y axis) against frequency ( x axis).
characterization of components
Microwave or satellite antenna alignment
Adjacent channel power
Dynamic range: +30dBm to -131dBm
Frequency range: 50Hz to 6.5GHz
Input impedance: 50ohms
Resolution bandwidth: 10Hz to 1MHz
Video bandwidth: 1Hz to 3MHz
Form factor: Mainframe
Frequency accuracy: 0.0000000004 %