146 Keysight Technologies N9040B UXA Signal Analyzer Service Guide
RF Section Troubleshooting (RF/Microwave 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 (Options 508, 513, and
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
2 each, quality SMA or 3.5 mm cables
90
°
SMA (m) to SMA (f) adapter
MMCX (f) to SMA (f) cable or adapter
SMA (f) to SMA (f) adapter
SMA (m) to SMA (m) adapter
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 (Channel)
,
Center
Frequency
,
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”
If the power level is not within tolerance, press
FREQ (Channel)
,
Toggle Swept
Span to Zero Span
,
AMPTD (Y Scale)
,
Attenuation
,
10 dB
.
To perform the following checks, it will be necessary to remove the outer cover, top brace, and
possibly more brackets. See
Chapter 15, “Assembly Replacement Procedures.”
for
removal procedures.
Содержание N9040B Option 513
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Страница 138: ...138 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Instrument Messages Condition Messages ...
Страница 240: ...240 Chapter 11 Hardware Options A21 Wideband Analog IF Troubleshooting Figure 11 1 Analog IF Block Diagram ...
Страница 256: ...256 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Block Diagrams Block Diagrams Block Diagrams ...
Страница 306: ...306 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Replaceable Parts Figure 14 2 External Hardware ...
Страница 338: ...338 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Replaceable Parts Figure 14 28 Chassis ...
Страница 346: ...346 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Replaceable Parts ...
Страница 502: ...502 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Post Repair Procedures ...
Страница 532: ...532 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Functional Tests Scale Fidelity ...
Страница 536: ...536 Keysight Technologies N9040B UXA Signal Analyzer Service Guide Instrument Software Software Updates ...
Страница 541: ...Index Index 541 Y yellow LED 48 51 yig filter see A12 YTF YTF see A12 YTF ...