Agilent Technologies 8590 Series Service Manual page 630

Analyzer Messages
Interpreting Analyzer Messages
Comb harmonic at_ _ _ GHz NOT found (U)(H)
Indicates that the CAL YTF routine for the analyzer cannot find a
harmonic of the comb generator at frequency displayed.
Related Assemblies
8590L and 8591E spectrum analyzers only: A3A8 YIG-tuned filter, A7
analog interface assembly.
All other 8590 E-Series and L-Series spectrum analyzers: (except
8594D) A3A8 switched YIG-tuned filter, A7 analog interface assembly.
Troubleshooting Hints
Ensure that the 100 MHz COMB OUT connector (for an 8592L, 8593E,
or 8596E) or the CAL OUT connector (for an 8595E) is connected to the
analyzer input with a low-loss, short cable before the CAL YTF routine
is performed.
COMB SIGNAL NOT FOUND (U)(H)
This message applies to 8592L, 8593E, 8596E model analyzers only.
During the
CAL YTF
found.
Related Assemblies
A3A1 comb generator, A3A11 step-recovery diode, A3A12 3dB
attenuator, J2 comb-generator output connector.
Troubleshooting Hints
• Make sure that the 100 MHz COMB OUT is connected to the
analyzer input using the comb generator cable (SMA to Type N)
supplied with the analyzer. (A comb generator cable (SMA to SMA)
is supplied with Option 026 instruments.)
• Perform the following steps to verify the comb-generator output
manually.
1. Press the following keys.
PRESET
FREQUENCY
, 500,
SPAN MHz
630
self-calibration routine, the comb signal cannot be
, 100,
MHz
Chapter 14