DQR ID | Subject | Data Streams Affected |
---|---|---|
D070201.1 | TWP/VCEIL/C3 - Reduced sensitivity to high clouds | twpvceil25kC3.b1 |
D070201.2 | TWP/VCEIL/C2 - optical cross-talk compensation | twpvceil25kC2.b1 |
D070329.1 | TWP/VCEIL/C2 - Receiver failure | twpvceil25kC2.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 |
---|---|---|---|
12/13/2006 | 0000 | 02/05/2007 | 0028 |
Subject: | TWP/VCEIL/C2 - optical cross-talk compensation |
DataStreams: | twpvceil25kC2.b1 |
Description: | The ceilometer gave frequent optical cross-talk compensation warnings, was insensitive to high clouds, and the tropics window was deteriorated. The instrument was replaced with a spare. |
Measurements: | twpvceil25kC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/11/2007 | 2120 | 04/17/2007 | 2325 |
Subject: | TWP/VCEIL/C2 - Receiver failure |
DataStreams: | twpvceil25kC2.b1 |
Description: | The receiver failed and the instrument was replaced. Data during the specified period are not valid. |
Measurements: | twpvceil25kC2.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:
|