DQR ID | Subject | Data Streams Affected |
---|---|---|
D070201.1 | TWP/VCEIL/C3 - Reduced sensitivity to high clouds | twpvceil25kC3.b1 |
D070503.3 | TWP/VCEIL/C3 - Reduced sensitivity to high clouds | twpvceil25kC3.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/20/2006 | 0401 | 01/12/2007 | 0120 |
Subject: | TWP/VCEIL/C3 - Reduced sensitivity to high clouds |
DataStreams: | twpvceil25kC3.b1 |
Description: | The instrument produced a significant number of optical cross-talk warnings and displayed a reduced capacity to detect high clouds. The internal cables were inspected, the compensation fiber and optics monitor were replaced, the crosstalk compensation was adjusted, and the system tested with an optical termination hood, all with no improvement. While waiting for a new receiver board, receiver ribbon cable, and compensation fiber cable from Vaisala, a spare ceilometer with a standard, "non-tropics", window was installed. |
Measurements: | twpvceil25kC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/18/2007 | 1630 | 07/11/2007 | 0550 |
Subject: | TWP/VCEIL/C3 - Reduced sensitivity to high clouds |
DataStreams: | twpvceil25kC3.b1 |
Description: | The instrument had reduced sensitivity to high clouds. The instrument produced a significant number of optical cross-talk warnings and displayed a reduced capacity to detect high clouds. The window was cleaned and the instrument was power-cycled but with no improvement. Diagnostics indicated the problem was with the compensation fiber cable. The problem was corrected by replacing this standard-window instrument (that was tilted at 16 degrees) with a tropics unit that became available. |
Measurements: | twpvceil25kC3.b1:
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