5-26 Service Guide N5227-90001
Theory of Operation PNA Series Microwave Network Analyzers
Receiver Group Operation N5227A
The A27 mixer brick sends the EXT TSET DRIVE LO OUT signal to a rear-panel connector for use with an
external test set. This same output connector on the A28 mixer brick is terminated.
A24 IF Multiplexer Board
This assembly provides pulse modulation capability and routes the IF signal out through the rear panel
connectors for external use and routes external signals in through rear panel connectors to be included in
the signal processing.
In this assembly, on 4-port models, a single reference signal is selected from R1, R2, R3, and R4 to be sent on
to the A16 SPAM. On 2-port models the R1 and R2 reference signals are sent to the A16 SPAM.
The analog IF signals (A, B, C, D, and R for 4-port models and A, B, R1, and R2 for 2-port models) are sent to
the A16 SPAM board where they are converted to digital information.
Rear Panel Interconnects
The A24 IF multiplexer board includes the following rear panel interconnects.
PULSE I/O A DB-15 female connector. Pin assignments are listed in Table 5-5 on page 5-27.
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