Agilent Technologies 8590 Series Service Manual page 658

Analyzer Messages
Interpreting Analyzer Messages
VID-BW FAIL (H)
During the routine, the video bandwidth check has failed.
CONF TEST
The test checks for a decrease in the peak-to-peak excursion of the noise
trace as the video bandwidth is decreased.
Related Assemblies
A14 log amplifier/detector, A16 processor/video assembly.
Troubleshooting Hints
The routine performs a functional check of switching for the
CONF TEST
video bandwidth circuitry on the A16 processor/video assembly.
Refer to description in Chapter 13 for more information
CONF TEST
about the confidence test routine.
Problems with the low-pass filter on the A14 log amplifier/detector
assembly can cause the video bandwidths to appear to be incorrect.
YTF is not available (U)
The YTF is only available for the 8592L, 8593E, 8595E, and 8596E.
Waiting for gate input...(U)
Indicates that the analyzer needs an external trigger signal to use the
time-gating functions.
Related Assemblies
A16 processor/video assembly, A105 gated video board assembly.
Troubleshooting Hints
Before using the time-gating functions, ensure there is a trigger pulse
connected to the GATE TRIGGER INPUT connector on the rear panel
of analyzer and that the GATE OUTPUT is connected the EXT TRIG
INPUT connector. If the connections are correct and, after an
instrument preset, the error message is still displayed, the internal
triggering circuitry on the A16 processor/video assembly may not be
functioning correctly. If you do not want to use the time-gating
functions, press .
PRESET
658 Chapter 14