U3047AM08
Service Information
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Theory of Operation
The following is a description of the operation of the test set. Reference the
test set block diagrams shown in
. This section assumes
the user has a general understanding of couplers, switches, and network
analyzers.
The test set adds 8 test ports to a 4-Port network analyzer. The internal RF
switches direct the source and receiver signals of the network analyzer to the
selected measurement test port.
The switches and couplers are arranged in four groups to control the source
and receiver paths of the network analyzer port to the couplers in the column
under the network analyzer port.
Test Set Control Board
The Test Set Control Board (N5261-63006) is a surface mount, printed circuit
assembly (PCA). It provides a connection to the power supply, and the network
analyzer Test Set I/O for control of the RF switch paths (through the Switch
Interface board (U3025-60068). The front panel “Active” and port LEDs are on
only when the network analyzer has addressed the U3047AM08 test set. The
rear panel fan is on when the controller board supplies are operational.
Switch Interface Board
The Switch Interface board (U3025-63068) is installed on top of the test set
Controller Board and provides connections to the RF switches. This board
regulates the DC voltage supply (24 volts), and routes logic signals to the
switches through harness cables connected to plugs J10-15, J20-25, J30-35
and J40-45.
Front Panel LED Boards
Four LED board assemblies (N5261-63005) are mounted to the front panel.
The LEDs indicate the Source Path (amber/yellow color), or Receiver Path
(green colored) shown as “S” and “R” on the front panel. The LED board
assemblies are connected to the test set controller board by ribbon cables to
J5, J6, J7 and J8.
DUT Control Board
The DUT Control Board (U3020-63223) provides eight control lines for
controlling an external device. The DUT Control Board installed on the rear
panel and is connected to the test set Control Board through a ribbon cable to
J9.
Power Supply
The switching power supply (0950-4729) coverts the AC line voltages to DC.
This is an automatic line voltage selecting power supply. The DC supplies are
connected to the test set control board through four wire harness to J11, J12,
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Keysight U3047AM08 User's and Service Guide
