Keysight N5224B/25B Service Guide 5-9
Theory of Operation
Network Analyzer System Operation
https://www.keysight.com/us/en/assets/9018-04179/technical-specificatio
ns/9018-04179.pdf
Refer to
“Synthesized Source Group Operation” on page 5-10
Signal Separation Group
Each of the incident signals from the source group is separated into a reference
path and a test path. The reference signal is transmitted to the receiver group.
The test signal is transmitted through—and reflected from—the DUT and is then
transmitted to the receiver group.
The signal separation group includes:
— RF path switching to allow forward and reverse measurements
— external connections for the DUT (configurable test set)
— optional step attenuators in the source and receiver paths
— optional bias tees
Refer to
“Signal Separation Group Operation” on page 5-41
Receiver Group
The receiver converts the test and reference signals to 7.438 MHz intermediate
frequency (IF) signals for signal processing, retaining both magnitude and
phase characteristics. The IF signals are converted to digital information by the
digital processing group.
Refer to
“Receiver Group Operation” on page 5-47
Digital Processor and Digital Control Group
The digital processor and digital control group are divided into a front panel
group and a data acquisition and processing group. The front panel group
provides communication to the network analyzer. The data acquisition and
processing group provides the output to the display, in addition to signal
processing and analyzer control.
Refer to
“Digital Processing and Digital Control Group Operation” on
Power Supply Group
The power supply functional group provides power for the other assemblies in
the instrument.
Refer to
“Power Supply Group Operation” on page 5-57
1. Version 7 synthesizers: For PNA frequency ranges and maximum output power lev-
els, refer to the section “Test Port Output” in the online Keysight document,
“N5224/5B– (900 Hz) 10 MHz to 50 GHz Data Sheet and Technical Specifica-
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