Agilent Technologies N5241A, Service Manual

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5-2 Service Guide N5242-90001
Theory of Operation PNA Series Microwave Network Analyzers
Information in This Chapter N5241A/42A
Information in This Chapter
This chapter provides a general description of the operating theory of the N5241A/42A
2-port and 4-port PNA microwave network analyzers.
• Theory of operation is explained to the assembly level only.
• Component-level circuit theory is not provided.
• Simplified block diagrams are included for each functional group.
• More detailed block diagrams are located at the end of Chapter 4, “Troubleshooting.”
IMPORTANT Although simplified block diagrams are included within the description of
each functional group, it is recommended that the more detailed block
diagrams, located at the end of
Chapter 4 , be available for reference, as you
read the information in this chapter.
Chapter Five at-a-Glance
Section Title Summary of Content Start Page
Network Analyzer System
Operation A summary of the theory of operation for the
analyzer.
A summary of the operation of the major
functional groups of the analyzer.
Page 5-3
Synthesized Source Group
Operation Operation of the assemblies associated with the
source group. Page 5-7
Signal Separation Group
Operation Operation of the assemblies associated with
signal separation, including the operation of
optional source attenuators, mechanical
switches, and bias tees. Page 5-16
Receiver Group Operation Operation of the assemblies associated with the
receiver group including the operation of
optional receiver attenuators. Page 5-21
Noise Measurement Group
Operation (Option 029) Operation of the assemblies associated with the
noise measurement group. Page 5-27
Digital Processing and Digital
Control Group Operation Operation of the assemblies associated with
digital processing and digital control. Page 5-29
Power Supply Group
Operation Operation of the power supply assembly group. Page 5-34