A34-A37 65-Db Source Step Attenuators And A38-A41 Bias Tees (Optional); A46-A49 Mechanical Switches And A50 Combiner (Optional) - Keysight N5241A Service Manual

Theory of Operation
Signal Separation Group Operation
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.
5-22 Keysight N5241A/42A/49A Service Guide