180 Keysight Technologies N9040B UXA Signal Analyzer Service Guide
Front End Control Troubleshooting
A15 Front End Control Assembly Troubleshooting
RF Signal Tracing
Refer to
Chapter 4, “RF Section Troubleshooting (RF/Microwave Analyzers)”
for this method of troubleshooting if you are unable to use an Oscilloscope
Verifying Narrowband IF Out (A15J900)
The outer cover and top shield need to be removed to verify A15J900 I.F.
output to the A2 Analog IF assembly. Refer to
for the removal procedure. Press
MODE/MEAS
,
Spectrum Analyzer
,
OK
,
Mode Preset
on the analyzer. Press
Input/Output
,
RF
Calibrator
,
50 MHz
,
FREQ
,
50 MHz
,
Span
and toggle from Swept Span to Zero
Span. Press
Amptd
,
Attenuation
,
10 dB
,
Amptd
,
Signal Path
and verify
Internal Preamp Low Band toggle is set to Off. Press
System
,
Alignments
,
Auto Align
and choose
Off
from the drop-down menu. Disconnect the cable
marked J900 that plugs into the top of the A15, Front End Controller board and
connect a functioning spectrum analyzer where the cable was plugged in.
J900's output should be 322.5 MHz at ~-20 dBm on the functioning spectrum
analyzer if the Front End Controller board is switching this level correctly. If -20
dBm is not being measured correctly, remove the cable labeled J902 from the
Front End Controller board and measure the output of that cable. This should
also measure 322.5 MHz at ~-20 dBm. If the output of the J902 cable
measures correctly and yet the output of J900 is incorrect, the most probable
cause is the A15, Front End Controller board.
Reconnect all cables to their correct location when finished with the
measurements.
IMPORTANT
When plugging in an mmcx connector, a distinct “snap” should be heard
when the cable is seated correctly.
Verifying Aux IF Out, Rear Panel (Option CR3, CRP, ALV only)
The Aux I.F. output connector on the rear panel of the UXA is installed on each
instrument; however the actual Aux I.F. output frequency will vary depending
on the options installed. These options are all enabled with a license key. The
first step in verifying the Aux I.F. output is the make sure the option is licensed
by pressing
System
,
Show
,
System
on the analyzer and make sure the option
identifies itself in the table.
The I.F. switch path and frequency generation occurs on the A15, Front End
Controller board. This troubleshooting procedure provides the instrument
setups to verify options CR3, CRP and ALV. Test the Aux I.F. output based on
the options installed in the analyzer.
Standard UXA
No test to perform.
Содержание N9040B Option 513
Страница 4: ...4 ...
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 ...