626 Chapter14
Analyzer Messages
Interpreting Analyzer Messages
CAL: RES BW AMPL FAIL (H)
During the CAL AMPTD routine, the insertion loss of a resolution
bandwidth filter, relative to the amplitude of the 3 kHz resolution
bandwidth filter, was greater than 2.2 dB.
Related Assemblies
A7 analog interface, A11 bandwidth filter, A13 bandwidth filter, A14 log
amplifier/detector.
Troubleshooting Hints
The CAL AMPTD routine will stop at the resolution bandwidth that
failed. If the A11/A13 bandwidth filter assemblies require realignment,
use the crystal and LC bandwidth filter adjustment procedures in
Chapter 2.
If a defective bandwidth filter board is suspected, refer to “IF
Power-Level Measurement” in Chapter 5.
CAL SIGNAL NOT FOUND (U)(H)
During a self-calibration routine, the CAL OUT signal cannot be found.
The primary purpose of the CAL OUT check is to confirm that CAL
OUT is connected to the input. A CAL OUT signal that is not within
300 MHz ±50 MHz, or is not greater than or equal to −45 dBm, causes
this error message to be displayed.
Related Assemblies
A7 analog interface, A9 third converter.
Troubleshooting Hints
If one of the following conditions are present, the error message is
displayed.
• The CAL OUT signal is missing. Ensure that the CAL OUT is
connected to the input connector using the CAL OUT cable supplied
with the analyzer.
Refer to Table 1-4 for the part number of the CAL OUT cable.
If the calibration cable is connected properly, manually check the
CAL OUT signal.
• The CAL OUT signal is not within ±50 MHz of 300 MHz, or it has an
amplitude less than or equal to −45 dBm. The test limits are large
enough to indicate an obvious failure for either the CAL OUT signal
or the analyzer.
• The DEFAULT CAL DATA is in use and the frequency of the CAL
OUT signal appears out of tolerance.
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