A34-A37 65-Db Source Step Attenuators And A38-A41 Bias Tees (Optional); A46-A49 Mechanical Switches And A50 Combiner (Optional) - Agilent Technologies N5242A Service Manual

Theory of Operation PNA Series Microwave Network Analyzers
Signal Separation Group Operation N5241A/42A
A34–A37 65-dB Source Step Attenuators and A38–A41 Bias Tees
(Optional)
On 4-port models with Option 419 or 423, a step attenuator and a bias tee are placed in the
signal path of each test port between the A25–A28 bridges and the A29–A32 test port
couplers.
On 2-port models with Option 219 or 224, a step attenuator and a bias tee are placed in the
signal path of each test port between the A25 and A28 bridges and the A29 and A32 test
port couplers.
The 65-dB step attenuators provide coarse power control for the test port signals. They are
electro-mechanical step attenuators that provide 0 to 65 dB of attenuation in 5-dB steps.
They adjust the power level to the DUT without changing the level of the incident power in
the reference path. These attenuators are controlled by the A17 CPU board.
The bias tees are to provide DC biasing for the DUT.
A46–A49 Mechanical Switches and A50 Combiner (Optional)
On 4-port models with Option 423, a mechanical switch is placed in the signal path of each
test port between the A5 and A8 26.5 GHz sources and the A25–A28 bridges.
On 2-port models with Option 224, a mechanical switch is placed in the signal path of each
test port between the A5 and A8 26.5 GHz sources and the A25 and A28 bridges.
These switches allow the source signal to be routed to or from rear-panel connectors. The
internal source can be sent out through a rear-panel connector to be made available for
external use or an external source can be input through a rear-panel connector to be used
in place of the internal source signal.
In the port 1 signal path, there is an additional bridge (A50) which, when switched into the
signal path, is used as a combiner to combine two source signals from the rear panel. These
signals typically come from the analyzer's two internal sources and are jumpered on the
rear panel.
5-20 Service Guide N5242-90001