DQR ID | Subject | Data Streams Affected |
---|---|---|
D051209.4 | TWP/VCEIL/C3 - Degraded hardware | twpvceil25kC3.b1 |
D051216.6 | TWP/VCEIL/C3 - ceilometer lost sensitivity | twpvceil25kC3.b1 |
D060113.1 | TWP/VCEIL/C3 - low receiver sensitivity | twpvceil25kC3.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/16/2005 | 0000 | 12/12/2005 | 0505 |
Subject: | TWP/VCEIL/C3 - Degraded hardware |
DataStreams: | twpvceil25kC3.b1 |
Description: | It appears that the sensitivity of the Darwin ceilometer was degrading over a few month period leading up to September 2005. Beginning on September 16, 2005, the instrument shifted to a particularly bad state. Looking at the backscatter data, I do not see nearly as great a day-night difference in the background as I expect and there is very little sensitivity to clouds. There was cross talk error noted with that instrument. The ceilometer was replaced on December 12. |
Measurements: | twpvceil25kC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/16/2005 | 2300 | 12/12/2005 | 0500 |
Subject: | TWP/VCEIL/C3 - ceilometer lost sensitivity |
DataStreams: | twpvceil25kC3.b1 |
Description: | ceilometer sesitivity decreased suddenly and only very strong cloud reflections are observed in the first kilometer. |
Measurements: | twpvceil25kC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/12/2005 | 0555 | 05/18/2006 | 2300 |
Subject: | TWP/VCEIL/C3 - low receiver sensitivity |
DataStreams: | twpvceil25kC3.b1 |
Description: | The ceilometer reported frequent receiver alarms. There are periods when the receiver sensitivity dropped to about 50%. The problem was corrected by replacing the instrument with a spare. |
Measurements: | twpvceil25kC3.b1:
|