Keysight Technologies U3050BH11, Руководство пользователя и сервисное руководство

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U3050BH11 Theory of Operation
Theory of Operation
The following is a description of the operation of the Test Set. Reference the Test Set block
diagram shown in
Figure 27 on page 33 . This section assumes the user has a general
understanding of couplers, switches, and network analyzers.
The Test Set uses
two coupler s , two amplifiers and cables for RF transmission paths.
Coupler and Amplifiers
Port 1 Source Out to CPLR THRU
Port 1 Source Out is connected to Amplifier 1 input. The Amplifier’s output is connected to the
internal Coupler’s input. The internal couplers output is connected to Port 1 CPLR THRU.
Port 3 to CPLR THRU
Port 3 is connected to the Amplifier 2 input. The Amplifier’s output is connected to the internal
coupler’s coupled port.
RF Transmission Paths
•
Port 1 to Port 1
•
Port 1 RCVR R1 IN to RCVR R1 IN
•
Port 2 to DUT OUT
•
Port 2 CPLR ARM to PXA
•
Port 2 Source Out to Source Out
Coupler
The Coupler is being used as a power combiner. Amplifier 1 will see low signal loss
where Amplifier 2 output signal will encounter approximately 10 dB of coupling factor
loss. The Coupler provides isolation between the two Amplifier outputs.
Power Supply
The power supply (0950-4729) coverts the AC line voltages to DC and contains its own cooling
fan. The AC line voltage (100 to 240 V @ 50/60 Hz) is provided from the line module on the rear
panel. The power supply ±
9 Vdc will be used to bias the two amplifiers used in the Test Set.
Keysight U3050BH11 User's and Service Guide 31
Internal RF cable connections: