72 1100 Series DAD and MWD Reference Manual
3 Troubleshooting and Test Functions
Holmium Oxide Test Failed
The holmium oxide test in the detector has failed.
During the holmium test, the detector moves the holmium filter through the
light path while monitoring the detector signal response. As the edge of the
filter passes through the light path, the signal is interrupted. This is used to
determine the position of the filter, and whether the filter is moving correctly.
If the filter fails to move, the error message is generated.
Probable Causes
• Lamps switched off.
• Defective or dirty flow cell.
• Defective filter assembly.
• Defective achromat assembly.
• Defective optical unit.
Suggested Actions
✔ Ensure the lamps are switched on.
✔ Ensure the flow cell is inserted correctly, and is free from contamination
(cell windows, buffers etc.).
✔ Exchange the filter assembly.
✔ Exchange the achromat assembly.
✔ Exchange the optical unit.
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