Agilent Technologies 8590 Series Service Manual page 654

Analyzer Messages
Interpreting Analyzer Messages
SMPLR UNLCK (U)(H)
Indicates that the sampling oscillator circuitry is not functioning
properly.
Related Assemblies
8591E and 8590L spectrum analyzers and 8591C cable TV analyzers
only: A6 YTO, A25 counter lock board assembly.
All other 8590 E-Series and L-Series spectrum analyzers and 8591C
cable TV analyzers: A3A7 YTO, A25 counter lock board assembly.
Troubleshooting Hints
Check that the external frequency reference is correctly connected to
the EXT REF INPUT. Observe the frequency diagnostics. Look for
numbers that are out of tolerance.
SOFTKEY OVFL (U)
Softkey nesting exceeds the maximum number of levels.
SRQ _ _ _ (M)
The specified service request is active. Service requests are a form of
informational message and are explained in Appendix A of the
8590 E-Series and L-Series Spectrum Analyzers User's Guide.
STEP GAIN/ATTEN FAIL (H)
During the confidence test routine, , the step-gain switching
CONF TEST
check, has failed. Looking at displayed noise, the test steps the
reference level from −60 dBm to +30 dBm, in 10 dB increments, with
the input attenuator set to 60 dB. The error message is displayed if the
noise level does not increase for each 10 dB step in reference level.
Related Assemblies
A12 amplitude control.
Troubleshooting Hints
The confidence test performs a functional check of the A12 assembly
step gains; it does not check the function of the A12 step attenuators.
The test passes if it detects any increase in noise floor level for each
10 dB change in reference level.
There is no manual adjustment for the 10 dB step gains. The
self-calibration routine corrects for the 10 dB step gains
CAL AMPTD
and input attenuator errors. Refer to the description in
CAL AMPTD
Chapter 13 for more information.
654 Chapter 14