Service Guide 12-5
8719ET/20ET/22ET Theory of Operation
8719ES/20ES/22ES Functional Groups of the Analyzer
RF Network Analyzers
Functional Groups of the Analyzer
The operation of the analyzer is most logically described in five functional groups. Each
group consists of several major assemblies, and performs a distinct function in the
instrument. Some assemblies are related to more than one group, and all the groups are to
some extent interrelated and affect each other’s performance.
Power Supply. The power supply functional group provides power for the other
assemblies in the instrument.
Digital Control. The digital control group provides control to all assemblies in the
network analyzer. The graphics signal processor (GSP) provides an interface between the
CPU and the display.
Source. The source group supplies a phase-locked and leveled microwave signal to the
device under test.
Signal Separation. The signal separation group performs the function of an S-parameter
test set, dividing the source signal into a reference path and a test path, and providing
connections to the device under test.
Receiver. The receiver group measures and processes the input signals for display.
The following pages describe the operation of the assemblies within each of the functional
groups.
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