638 Chapter14
Analyzer Messages
Interpreting Analyzer Messages
FREQ UNCAL (U) (H)
The YTO (YIG-tuned oscillator) frequency is more than 20 MHz from
the desired frequency. If the FREQ UNCAL message appears
constantly, it indicates a YTO-tuning error and the CAL FREQ routine
should be performed. FREQ UNCAL appears briefly during the CAL
FREQ routine; this is normal and does not indicate a problem. (U) and
(H).
Related Assemblies
8590L and 8591E spectrum analyzers only: A6 YTO, A7 analog
interface, A25 counter lock.
All other 8590 E-Series and L-Series spectrum analyzers: A3A7 YTO,
A7 analog interface, A25 counter lock.
Troubleshooting Hints
• This error message may occur when using correction data from
DEFAULT CAL DATA. Refer to the DEFAULT CAL DATA description in
Chapter 13 for more information.
If DEFAULT CAL DATA is in use, the instrument self- calibration
routines must be run. Refer to the calibration guide for your
instrument.
• The error message may occur if incomplete frequency calibration
factors are used. Interrupting the
CAL FREQ self-calibration routine
produces incomplete frequency calibration data.
Performing the CAL FREQ routine may eliminate the problem. Be
sure to press
CAL STORE to store the correction factors produced by
CAL FREQ.
• The error message may occur if either the reference oscillator or the
sampling oscillator on the A25 assembly is unlocked.
Refer to “Isolating an RF, LO, IF, or Video Problem” in Chapter 4 for
further information.
Function not available in current Mode (U)
Indicates that the function that you have selected can only be used with
the spectrum analyzer mode. You can use the
MODE key to select the
spectrum analyzer mode.
Function not available with analog display (U)
Indicates that the function that you have selected is not compatible
with the Analog+ display mode. To use the function, you must first turn
off the Analog+ display mode with
ANALOG+ ON OFF.
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