Agilent Technologies 8590 Series Service Manual page 648

Analyzer Messages
Interpreting Analyzer Messages
4. When the comb-generator output amplifier is enabled, the
amplitude of the 100 MHz signal and the 100 MHz harmonics
increase. The 100 MHz signal amplitude increases to
approximately +12 dBm.
If the signal amplitude does not increase, check that the
comb-generator control line from the A7 analog interface
assembly is switching correctly.
Refer to Foldout 11-2, 11-3, or 11-4, RF Section Overall Block
Diagram for your analyzer, for more information about the
comb-generator control voltage values.
If the A7 control line is correct, suspect the A3A11
step-recovery diode or the A3A1 comb generator.
Refer to Foldout 11-2, 11-3, or 11-4, RF Section Overall Block Diagram
for your analyzer, for more information.
OVEN COLD (M)
This message is displayed for instruments equipped with Option 004,
precision frequency reference.
The message is displayed for 5 minutes after the instrument is turned
on. The message alerts the user that the oven in the A22 precision
frequency reference has not been on long enough to warm the reference
to its operating temperature.
Related Assemblies
A22 precision frequency reference.
Troubleshooting Hints
This is a timed message that comes on whenever the instrument is
turned on; the temperature of the A22 precision frequency reference
oven-controlled crystal oscillator (OCXO) is not measured.
The instrument firmware displays the message only when it senses
that the A22 assembly is connected to its power supply through W15,
the OCXO power cable. If the message does not appear, check the W15
cable.
PARAMETER ERROR: _ _ _ (U)
The specified parameter is not recognized by the analyzer. See the
appropriate programming command description to determine the
correct parameters.
PASSCODE NEEDED (U)
Indicates that the function cannot be accessed without the pass code.
648 Chapter 14