146
RF Section Troubleshooting
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. Refer to Chapter 11, “Block Diagrams” for details.
Equipment needed:
Functioning Spectrum Analyzer
DVM
Cables & Connectors
NOTE To perform the following checks, it will be necessary to remove the outer
cover and the top brace. See Chapter 14 for removal procedures.
Turn the analyzer 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), 50 MHz,
SPAN (X Scale), 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. To
verify the high band path go to “Quick Check to Verify High Band RF Path #1”
on page 174.
If the power level is not within tolerance, press SPAN (X Scale), Zero Span,
AMPTD (Y Scale), Attenuation, 10 dB.
IMPORTANT Turn off auto align by pressing System, Alignments, Auto Align, Off.
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