A38-A41 60-Db Source Step Attenuators And A471-A45 Bias Tees (Optional) - Keysight N5227B Service Manual

Theory of Operation
Signal Separation Group Operation
A38–A41 60-dB Source Step Attenuators and A471–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.
A42–A45 60-dB Source Step Attenuators and A71–74 Bias Tee
Combiners (Optional)
On 4-port models with Option 405, 420, or 425, a step attenuator and a bias
tee are placed in the signal path of each test port between the A33–A36
reference (receiver) couplers and the A37–A40 test port couplers.
On 2-port models with Option 205 and 220, a step attenuator and a bias tee
are placed in the signal path of each test port between the A33 and A36
reference (receiver) couplers and the A37 and A40 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 tee combiners are to provide DC biasing for the DUT via the N5292A
PNA Millimeter Test Set and millimeter heads. Refer to
www.keysight.com/find/pna.
See also,
on page
5-36
"A70 4-Port and A75 2-Port Low Frequency Extension (LFE) Board"
5-20.
Keysight N5227B Service Guide