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Service Information
Theory of Operation
Functional Block and Assembly Information
The N5261A/62A routes PNA-X LO and RF signals to a millimeter-wave
module. This allows the PNA-X to up-convert for a millimeter-wave source and
down-convert a received millimeter-wave frequency to an IF frequency 7.6
MHz. It also provides the DC power for the millimeter-wave module. The
following components are used in the N5261/62A. Refer to the block
diagrams,
Figure 2-3
through
Figure 2-6
beginning on
page
53.
Test Set Control Board (N5261-60006)
The Test Set Control board (N5261-60006) is a surface mount, printed circuit
assembly (PCA) that provides a connection to the power supply and the PNA-X
Test Set I/O. The PNA-X sends address and data commands which are read by
the test set controller for selecting the switch paths of the SRC1 and SRC2 RF
and IF switch paths. The test set controller board has a programmed FPGA and
memory (NovRam) with model number and gain correction values for the
Amplifiers and ALC circuits. Switch S1 is set to lock the memory after
calibration is been loaded. The front panel "Active" and port LEDs are only on
when the PNA-X has addressed the N5261/62A Millimeter Head Controller.
The rear panel fan is on when the Controller board supplies are operational.
IF the Controller board is replaced, the gain data will need to be stored into the
new board. Refer to
"Contacting Keysight" on page 92
for the replacement
procedure.
Interface Board (N5261-60101)
The Interface board is installed on top of the test set controller board. It
provides switch drive signals and voltage for the solid-state switches that
select RF Inputs (SRC1 or SRC2) to one of the front panel RF Outputs ports. It
provides switching from the front panel TEST IF and REF IF Inputs to the rear
panel IF Outputs D/R2 C/R1, R, A, B. The board also provides DC voltage, ALC
control of the Amplifiers and a FPGA programmed device that enables
N5261/62A Millimeter Head Controller operation.
LED Board (N5261-60005)
Two LED board assemblies are mounted to the front panel. The top LED board
indicates the Source Path (amber/yellow color), or Receiver Path (green
colored) shown as "S" and "R" for each port. The bottom LED Board indicates
the DC Power is on (green). If an over-current condition occurs on the
millimeter-wave module the LED will be (amber/yellow), which could be a
result of a shorted interface cable or damaged Millimeter-wave module. The
LED board assemblies are connected to the test set controller board by ribbon
cables.
Keysight N5261/62A User's & Service Guide
60
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