A38-A41 60-Db Source Step Attenuators And A42-A45 Bias Tees (Optional) - Keysight N5227A Service Manual

Theory of Operation PNA Series Microwave Network Analyzers
Signal Separation Group Operation N5227A
A38–A41 60-dB Source Step Attenuators and A42–A45 Bias Tees (Optional)
On 4-port models with Option 419, a step attenuator and a bias tee are placed in the signal path of each test
port between the A29–A32 receiver couplers and the A33–A36 test port couplers.
On 2-port models with Option 219, a step attenuator and a bias tee are placed in the signal path of each test
port between the A29–A32 receiver couplers and the A33 and A36 test port couplers.
The 60-dB step attenuators provide coarse power control for the test signals. They are electro-mechanical
step attenuators that provide 0 to 60 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 A21 CPU board.
The bias tees are to provide DC biasing for the DUT.
5-24 Service Guide N5227-90001