Agilent Technologies PSA Series Service Manual page 74

Troubleshooting the RF Section (E4440A, E4443A, E4445A)
RF Section Description (E4440A, E4443A, E4445A)
Figure 3-3 Block Diagram with RF Options - E4440A, E4443A, E4445A
Option BAB
(E4440A only) - APC 3.5 mm input connector. Standard PSAs use a
Option B7J
Option 1DS
Option AYZ
(E4440A only) - External Mixing. Allows an external preselected or
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precision machined Type N connector for the RF input.
- Digital Demod Hardware. The electronic attenuator
works over the lowband frequency range. In bypass
mode, the coax switches in the electronic attenuator
board route the RF signal on through to the Lowband
board. The electronic attenuator path consists a 40 dB,
1 dB step solid state attenuator.
- Low Band Preamp. In bypass mode, the coax switches
route the Low Band RF signal on to the Lowband
assembly. When in preamp mode the 30 dB gain, low
noise figure amplifier path is selected.
unpreselected mm wave mixer to be used with the
instrument.
Chapter 3