Chapter 14 649
Analyzer Messages
Interpreting Analyzer Messages
POS-PK FAIL (H)
The positive-peak-detector check has failed during the confidence test
routine,
CONF TEST. The level of the noise floor for the positive-peak
detector is statistically compared to that of the sample detector. The
mean of the data from the positive-peak detector should be greater than
the mean of the data from the sample detector.
Related Assemblies
A16 processor/video assembly.
Troubleshooting Hints
This test performs a functional check of switching for the positive-peak
detector on the A16 processor/video assembly.
Refer to the CONF TEST description in Chapter 13 for more information
about the confidence test routine.
REF UNLOCK (M)(H)
The oscillator on the A9 third converter is not locked to a 10 MHz
frequency reference. The analyzer must be connected to one of the
following frequency references.
• 10 MHz standard timebase. The reference is a room-temperature
crystal oscillator (RTXO) that is located on the A25 assembly.
• Precision frequency reference. The reference is a oven-controlled
crystal oscillator (OCXO).
• External 10 MHz frequency reference.
Related Assemblies
A22 precision frequency reference, standard 10 MHz reference, A25
counter lock.
Troubleshooting Hints
Refer to Foldout 11-2, 11-3, or 11-4, RF Section Overall Block Diagram
for your analyzer, for more information.
1. Check the rear-panel cable connections for the 10 MHz reference.
When using either the standard 10 MHz timebase or the precision
frequency reference, make sure that the 10 MHz REF OUT on the
rear panel is connected to the EXT REF IN. The W6 jumper is
supplied with the analyzer for this purpose.
When using an external 10 MHz reference, make sure it is connected
to the EXT REF IN on the rear panel.
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