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668 Chapter9
If You Have a Problem
Spectrum Analyzer Problems
• Review the test procedure that was being used when the problem
occurred. Are all the settings correct?
• Are the measurements that are being performed and the expected
results within the specifications and capabilities of the spectrum
analyzer? Refer to the calibration guide for specifications.
Hardware Problems
Some of the procedures in this chapter may clear hardware problems.
• Trace Alignment
• Reference Level Calibration
• Realigning the LO and IF
If the necessary test equipment is available, perform the verification
tests in the calibration guide. Record all results in the performance test
record.
If you have an Agilent 85629B Test and Adjustment Module, you can
use its automatic fault isolation routine to troubleshoot your Agilent
8560E/EC, Agilent 8561E/EC, or Agilent 8563E/EC. Refer to "Running
the Automatic Fault Isolation Routine" in this chapter.
If there is a hardware problem, you can repair it yourself or return the
analyzer to Agilent Technologies for repair. See "Returning Your
Spectrum Analyzer For Service" for more information.
Table 9-1 Problems and Possible Causes
Symptoms Things to Check
GPIB doesn't work • Check that GPIB cable is connected and cable is good.
• Check that GPIB address is set correctly. (See "GPIB
Address Selection")
• Disconnect equipment from GPIB one instrument at a
time and retry.
Doesn't plot/print Refer to "Plotting and Printing Directly".
Can't find signal • Check for the local oscillator signal at 0 Hz which
indicates that the hardware is probably good.
• Narrow the resolution bandwidth in case the signal is
being obscured.
Signal amplitude is
wrong
• Refer to "Reference Level Calibration".
• Increase input attenuation, since the signal may be in
compression.
Amplitude dropouts Mating a K connector with APC 3.5 results in moding near
32 GHz. Power holes exist at other frequencies when using
adapters and cables beyond their specified range.
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