272 Keysight NFA Series Noise Figure Analyzers Service Guide
L.O. Synthesizer/Reference Troubleshooting
A14 L.O. Synthesizer Troubleshooting
A14 L.O. Synthesizer Troubleshooting
Turn on the analyzer and wait for the instrument to complete the boot up
process. There are (6) processes to perform, which will verify the L.O.
Synthesizer Assembly is functioning properly:
—Press MODE/MEAS, Spectrum Analyzer, OK, FREQ, 50 MHz, Zero Span.
LED's DS1-DS3 located near the top of the board next to J10 should all be
off. See LED location in Figure 8-1 below.
—Press System, Alignments, Align Now, Align Now All. If the alignment
functions correctly with no error messages on the analyzer display, most of
the board is working properly.
— Measure 4800 MHz Input frequency (from A16 Reference Assembly)
— Measure 4800 MHz Input Power (from A16 Reference Assembly)
—Measure L.O. Output Power.
— Measure L.O. Output Frequency.
These items can be checked with a functioning spectrum analyzer using cables
and connectors that function well up to 10 GHz.
Figure 8-1 A14 L.O. Synthesizer Assembly
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