14-3
Block Diagram Theory of Operation

Technical Discussion

Technical Discussion
TheHP/Agilent 8922 can be divided into two instruments, a signal generator and a signal
analyzer. This discussion is intended to follow the block diagrams in chapter 13. The
assembliesin Block Diagrams 1 and 2 are covered first. These are the primary assemblies
where it is possible to do assembly level measurement and troubleshooting. All the
hardware in Block Diagrams 1 and 2 are common to all HP/Agilent 8922 instruments.
Block Diagrams 3 and 4 illustrate hardware that is unique to the HP/Agilent 8922B and
HP/Agilent 8922E/F/G/H respectively. Because these modules are primarily digital, the
discussion on this hardware is limited to a high level functional description. Often
troubleshootingthese boards is difficult at the module level without sophisticated logic or
signatureanalysis. Module swap is the fastest way to troubleshoot hardware problems for
these assemblies. The final discussion focuses on the modules in Block Diagram 5. More
information about troubleshooting display and controller problems is also included in
chapter 5.
When important, the input and output specifications for most assemblies are tabulated in
chapter 12, Module I/O Specs. For additional details on the exact signal levels and
frequencies for assembly inputs and outputs, refer to chapter 12, Module I/O Specs.