Agilent Technologies 8510XF Service Quick Reference Manual page 47

System Level Servicing & Troubleshooting
Theory of Operation
At this simplified level of description, system operation does not differ from
that of other 8510-based systems. What makes the 8510XF unique is the
means by which it covers its extremely wide frequency range.
Figure 5-2 shows how the 8510XF test set is divided into frequency bands.
For the sake of simplicity, this figure only shows half of the test set. An
actual test set, with two base units and two test heads, would include twice
as many mixers. Note that all bands make use of the same output/input
paths, the same connection to the DUT, and the same directional couplers.
Figure 5-2 Modules of the 7352A test set
8510XF Service Quick Reference Guide 5-3