Agilent Technologies 8590 Series Service Manual page 650

Analyzer Messages
Interpreting Analyzer Messages
2. If the rear panel connection is correct, check the power output of the
10 MHz frequency reference.
• The A22 standard 10 MHz timebase (RTXO) has an typical
output of 0 dBm ± 6 dB.
• A22 precision frequency reference (OCXO), has a typical output of
0 dBm ± 3 dB.
• An external 10 MHz reference should have an output between
−2 dBm and +10 dBm.
3. If the output of the 10 MHz reference is correct, check the continuity
of W18, the EXT REF IN cable, and W17, the 10 MHz OUT cable.
4. Check the continuity of the VTO_TUNE control line.
5. Check the continuity of the W14 ribbon cable and the W21 coaxial
cable.
6. Check the continuity of the A25 assembly connections to the A9
assembly that pass through the A15 motherboard.
7. If the error message is still present, suspect the A25 counter lock
assembly.
Require 1 signal > PEAK EXCURSION above
THRESHOLD (U)
Indicates that the N dB PTS routine cannot locate a signal that is high
enough to measure. The signal must be greater than the peak excursion
above the threshold level to measure.
Require 3 signals > PEAK EXCURSION above
THRESHOLD (U)
Indicates that the % AM routine cannot locate three signals that are
high enough to measure. The signals must be greater than the peak
excursion above the threshold level to measure.
Require 4 signals > PEAK EXCURSION above
THRESHOLD (U)
Indicates that the TOI routine cannot locate four signals that are high
enough to measure. The signals must be greater than the peak
excursion above the threshold level to measure.
Required option not installed (U)
Some analyzer functions require that an option be installed in the
analyzer. See the description for the function in the 8590 E-Series and
L-Series Spectrum Analyzers User's Guide for more information about
which option is required.
650 Chapter 14