DQR ID | Subject | Data Streams Affected |
---|---|---|
D060113.1 | TWP/VCEIL/C3 - low receiver sensitivity | twpvceil25kC3.b1 |
D060717.5 | TWP/VCEIL/C2 - Time offset | twpvceil25kC2.b1 |
D061220.34 | TWP/VCEIL/C3 - standard instrument installed | twpvceil25kC3.b1 |
D070201.1 | TWP/VCEIL/C3 - Reduced sensitivity to high clouds | twpvceil25kC3.b1 |
D070201.2 | TWP/VCEIL/C2 - optical cross-talk compensation | twpvceil25kC2.b1 |
D100215.4 | TWP/VCEIL/C1 - Reprocess: Incorrect serial_number and sum_backscatter fields | twpvceil25kC1.b1 |
D100215.5 | TWP/VCEIL/C2 - Reprocess: Incorrect serial_number and sum_backscatter fields | twpvceil25kC2.b1 |
D100215.6 | TWP/VCEIL/C3 - Reprocess: Incorrect serial_number and sum_backscatter fields | 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:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/13/2006 | 2224 | 07/17/2006 | 1912 |
Subject: | TWP/VCEIL/C2 - Time offset |
DataStreams: | twpvceil25kC2.b1 |
Description: | On 7/14/2006, I found that the ceilometer time was 8m 36s slow, the PC time display (lower right taskbar) was frozen at "22:24", and AboutTime was not running. Corrected it on 7/17 by running AboutTime so that 19:03:29 became 19:12:05. This also corrected the frozen display on the Windows98 taskbar. I am not sure of the start time of this problem but there were several other Windows related issues that had to be corrected on 5/14 with indications of inappropriate access via Remote Administrator on 5/13. I do not know if the time offset was a sudden or gradual change. |
Measurements: | twpvceil25kC2.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:
|
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 |
---|---|---|---|
10/11/1996 | 0000 | 10/31/2009 | 2359 |
Subject: | TWP/VCEIL/C1 - Reprocess: Incorrect serial_number and sum_backscatter fields |
DataStreams: | twpvceil25kC1.b1 |
Description: | Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad. This DQR also applies to a1 level data. |
Measurements: | twpvceil25kC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/28/1998 | 0000 | 10/31/2009 | 2359 |
Subject: | TWP/VCEIL/C2 - Reprocess: Incorrect serial_number and sum_backscatter fields |
DataStreams: | twpvceil25kC2.b1 |
Description: | Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad. This DQR also applies to a1 level data. |
Measurements: | twpvceil25kC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/27/2002 | 0000 | 10/31/2009 | 2359 |
Subject: | TWP/VCEIL/C3 - Reprocess: Incorrect serial_number and sum_backscatter fields |
DataStreams: | twpvceil25kC3.b1 |
Description: | Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad. This DQR also applies to a1 level data. |
Measurements: | twpvceil25kC3.b1:
|