Specifications

Frequency Response Troubleshooting
Agilent Technologies
PSA Series Spectrum Analyzers
Test and Adjustment Software
Frequency Response Troubleshooting
Related Adjustments
● Frequency Response Adjustment
If the Frequency Response Test fails by a small amount (5 dB or less) the instrument can
probably be fixed by performing the Flatness Adjustment. If an adjustment cannot fix the
problem, or the test fails by a large error (5 dB or more), this would indicate a faulty
assembly.
In order to troubleshoot an RF problem, refer to the PSA Series Service Guide for
troubleshooting procedures and the overall block diagram. Assemblies can be bypassed
by injecting 321.4 MHz, or 3921.4 MHz signals at the appropriate places.
If the frequency response test fails at frequencies 3 GHz and above (high bands), the
following should be done:
Perform the Frequency Response Adjustment in its entirety. If the adjustment does not fix
the problem, or the adjustment can not complete, suspect a hardware problem. Major
assemblies at fault could be: The A19 RYTHM, the RYTHM/Bias control signals from
the A13 Front End Driver Assembly may be wrong, the amplitude of the LO signal from
A21 SLODA may be too low, or the A10 Third Converter input stage could be damaged.
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