Agilent Technologies N5241A, Service Manual

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5-16 Service Guide N5242-90001
Theory of Operation PNA Series Microwave Network Analyzers
Signal Separation Group Operation N5241A/42A
Signal Separation Group Operation
The signal separation group divides the source incident signals into a reference path and a
test path. Refer to
Figure 5-4 on page 5-18 and Figure 5-5 on page 5-19 .
• The reference signals are transmitted to the receiver group as the R1, R2, R3, and R4
inputs for 4-port models or the R1 and R2 inputs for 2-port models.
• The test signals are transmitted through—and reflected from—the device under test
(DUT) and then transmitted to the receiver group as the A, B, C, and D inputs for 4-port
models or the A and B inputs for 2-port models.
• Control lines to this group are routed from the A19 test set motherboard.
In this section, the following assemblies are described:
• A25–A28 Bridges
• A29–A32 Test Port Couplers
• Front Panel Jumpers— Configurable Test Set
• A34–A37 65-dB Source Step Attenuators and A38–A41 Bias Tees (Optional)
• A46–A49 Mechanical Switches and A50 Combiner (Optional)
Configurable Test Set
The configurable test set is included in the standard analyzer and allows you to measure
devices with higher power and higher dynamic range limits than an analyzer without the
configurable test set. On 4-port models, twelve signal paths, routed through front panel
SMA jumpers, comprise the configurable test set. On 2-port models, there are six signal
paths routed through front panels jumpers in the configurable test set.
As shown in Figure 5-4 on page 5-18 and Figure 5-5 on page 5-19 , these jumpers are
installed between the components listed below. Ports 3 and 4 apply only to 4-port models.
• the A25 port 1 bridge and the A23 mixer brick receiver R1
• the A26 port 3 bridge and the A24 mixer brick receiver R3
• the A27 port 4 bridge and the A24 mixer brick receiver R4
• the A28 port 2 bridge and the A23 mixer brick receiver R2
• the A25 port 1 bridge and the A29 test port 1 coupler
• the A26 port 3 bridge and the A30 test port 3 coupler
• the A27 port 4 bridge and the A31 test port 4 coupler
• the A28 port 2 bridge and the A32 test port 2 coupler
• the A29 test port 1 coupler and the A23 mixer brick receiver A
• the A30 test port 3 coupler and the A24 mixer brick receiver C
• the A31 test port 4 coupler and the A24 mixer brick receiver D
• the A32 test port 2 coupler and the A23 mixer brick receiver B