Signal Separation Group Operation; Configurable Test Set - Keysight N5221A Service Manual

PNA Series Microwave Network Analyzers
N5221A/22A

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 5-17
• 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 Receiver Couplers
• A29–A32 Test Port Couplers
• Front Panel Jumpers—Configurable Test Set
• A34–A37 65-dB Source Step Attenuators and A38–A41 Bias Tees

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 5-17
components listed below. Ports 3 and 4 apply only to 4-port models.
• the A25 port 1 receiver coupler and the A23 mixer brick receiver R1
• the A26 port 3 receiver coupler and the A24 mixer brick receiver R3
• the A27 port 4 receiver coupler and the A24 mixer brick receiver R4
• the A28 port 2 receiver coupler and the A23 mixer brick receiver R2
• the A25 port 1 receiver coupler and the A29 test port 1 coupler
• the A26 port 3 receiver coupler and the A30 test port 3 coupler
• the A27 port 4 receiver coupler and the A31 test port 4 coupler
• the A28 port 2 receiver coupler 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
Service Guide N5222-90001
and Figure 5-5 on page 5-18.
and Figure 5-5 on page
Signal Separation Group Operation
5-18, these jumpers are installed between the
Theory of Operation
5-15