Keysight Technologies U3047AE04, Руководство пользователя и сервисное руководство

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54 User’s and Service Guide U3047-90002
U3047AE04 Service Information
Theory of Operation
The following is a description of the operation of the Test Set. Reference the Test Set block
diagrams shown in
Figure 30 on page 36 . This section assumes the user has a general
understanding of couplers, switches, and network analyzers.
The Test Set adds four test ports to a 4-Port N5247A PNA-X Network Analyzer. The internal RF
switches direct the source and receiver signals of the PNA-X to the selected measurement test
port.
The switches and couplers are arranged in four groups to control the source and receiver paths
of the PNA port to the couplers in the column under the PNA port.
RF Coupler
The Test Set uses four couplers (5087-7725) on the front panel for RF Test Ports
5 - 8. The couplers provide the signal separation of the source and receiver paths. The Test Set
ports can receive from or stimulate a signal to the DUT.
RF Switch Components
The Test Set uses eight solid-state that have internal 50
Ω termination. The switches select the
RF paths from the PNA-X source and receiver through interconnect cables to the Test Set.
Test Set Control Board
The Test Set Control Board (N5261-60006) is a surface mount, printed circuit assembly (PCA). It
provides a connection to the power supply, and the PNA Test Set I/O for control of the RF switch
paths (through the Switch Interface board (U3047-63018). The front panel “Active” and port
LEDs are on only when the PNA has addressed the U3047AE04 Test Set. The rear panel fan is on
when the controller board supplies are operational.
Switch Driver Board
The Switch Driver board (U3047-63018) is installed on top of the Test Set Controller Board and
provides connections to the solid state RF switches. This board regulates the DC voltage supply
(−10 volts) and routes logic signals to the switches through cables connected to plugs J1 to J8.
Front Panel LED Board
One LED board assembly (N5261-60005) are mounted to the front panel. The LED’s 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.
DUT Control Board
The DUT Control Board (E5091-66503) 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.