DQR ID | Subject | Data Streams Affected |
---|---|---|
D061220.34 | TWP/VCEIL/C3 - standard instrument installed | twpvceil25kC3.b1 |
D070201.1 | TWP/VCEIL/C3 - Reduced sensitivity to high clouds | twpvceil25kC3.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/18/2006 | 2300 | 12/20/2006 | 0400 |
Subject: | TWP/VCEIL/C3 - standard instrument installed |
DataStreams: | twpvceil25kC3.b1 |
Description: | A spare ceilometer without the tropics window option was installed. The manufacturer recommends the tropics window be used at +/- 25 deg lattitude to prevent direct solar radiation into the laser optics when the instrument pointed at zenith. No significant signal degradation is apparent during the autumnal equinox but, as a precaution, the unit was replaced with the original with a tropics window. |
Measurements: | 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:
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