Agilent Technologies 8590 Series Service Manual page 646

Analyzer Messages
Interpreting Analyzer Messages
LO UNLVL (U)(H)
Indicates that the analyzer local oscillator distribution amplifier is not
functioning properly. This message may appear on the 8592L, 8593E,
8594E, 8595E, and 8596E with Options 009/010, Option 009, or
Option 010.
Related Assemblies
A10 LO distribution amplifier (LODA) control/tracking generator
control.
Troubleshooting Hints
Check the LO and gate bias adjustments on A10. Bias voltages are
sense
marked on a label on the top of the high frequency RF.
Marker Count Reduce SPAN (U)
Indicates the resolution bandwidth to span ratio is too small to use the
marker count function. Check the span and resolution bandwidth
settings.
Marker Count Widen RES BW (U)
Indicates that the current resolution bandwidth setting is too narrow to
use with the marker counter function. The marker counter function can
be in narrow resolution bandwidths (bandwidths that are less than
1 kHz) with the following procedure.
1. Place the marker on the desired signal.
2. Increase the resolution bandwidth to 1 kHz and verify the marker is
on the signal peak.
3. If the marker in on the signal peak, the marker count function can
be used in either the 1 kHz resolution bandwidth or the original
narrow resolution bandwidth setting. If the marker is not on the
signal peak, it should be moved to the signal peak and the marker
counter function should not be used with a resolution bandwidth
setting of less than 1 kHz.
646 Chapter 14