208 Keysight N9010B EXA Signal Analyzer Service Guide
RF Section Troubleshooting (Millimeter-Wave Analyzers)
Troubleshooting
Troubleshooting
Quick Check to Verify the Low Band Signal Path
The analyzer has an internal 50 MHz amplitude reference signal that is used to
verify the low band path. This 50 MHz calibrator is used when the analyzer
performs many of the internal alignment routines. Therefore, the functionality
of the 50 MHz calibrator and low band path are critical to passing Align All
Now. Refer to the RF Lowband Path Block Diagram (Millimeter-Wave
Analyzers) in Chapter 12 for details. Reference the instrument settings box on
the block diagram.
Equipment needed:
Spectrum Analyzer with frequency range to 8 GHz
Signal source with output power 0 dBm and frequency range to at least
3.6 GHz
Power splitter, 11667B or 11667C
2 each, quality SMA or 3.5 mm cables
90° SMA (m) to SMA (f) adapter
MMCX (f) to SMA (f) cable
SMA (f) to SMA (f) adapter
SMA (m) to SMA (m) adapter
3.5mm (f) to 2.4mm (m) adapters (2 required)
Turn the instrument on and allow it to complete its full boot up process to
Spectrum Analyzer mode. Use the internal 50 MHz, −25 dBm calibrator signal
as a reference for troubleshooting by pressing Mode Preset, Input/Output, RF
Calibrator, 50 MHz on the analyzer. Now press FREQ, 50 MHz, Span, 1 MHz,
Peak Search. The 50 MHz reference signal should measure 50 MHz @
−25 dBm ± 2 dB on the analyzer display. If the power level is within tolerance,
the low band path is functioning correctly at 50 MHz. If the power level is
incorrect, select the 4.8 GHz RF Calibrator and set the analyzer center
frequency to 4.8 GHz. Since several of the same signal path components are
shared between low band and high band, determining if the problem appears
in both paths is helpful.
To verify the high band path go to “Quick Check to Verify High Band RF Path”
on page 218.
To perform the following checks, it will be necessary to remove the outer cover and the top
brace. See Chapter 15 for removal procedures.
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