| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D030527.2 | SGP/SIRS/E27 - Instrument problem, Shadowband Misalignment | sgpsirsE27.00 |
| D030922.4 | SGP/SIRS/E27 - Tracker Misalignment | sgpsirsE27.00 |
| D040420.4 | SGP/SIRS/E27 - incorrect tracking | sgpsirsE27.00 |
| D080128.1 | SGP/SIRS/C1/E1/E10/E11/E12/E13/E15/E16/E18/E19/E2/E20/E21/E22/E24/E25/E27/E3/E4/E5/E6/E7/E8/E9 - Ice | sgpsirsE27.00 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/16/2003 | 0000 | 06/18/2003 | 1845 |
| Subject: | SGP/SIRS/E27 - Instrument problem, Shadowband Misalignment |
| DataStreams: | sgpsirsE27.00 |
| Description: | Downwelling and Upwelling longwave values are somewhat noisy due to noisy PIR (pygeometer) case and dome thermistor measurements on both the upwelling and downwelling PIRs. This problem dates back to the beginning of the SIRS E27 data stream. |
| Measurements: | sgpsirsE27.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/14/2003 | 1200 | 10/15/2003 | 1730 |
| Subject: | SGP/SIRS/E27 - Tracker Misalignment |
| DataStreams: | sgpsirsE27.00 |
| Description: | Suntracker failed at this facility. The suntracker was reset on
9/17, but this only temporarily fixed the problem and the tracker
began failing again 9/18. Tracker was reset and realigned on
10/15/03 17:30GMT and has been operating properly since. |
| Measurements: | sgpsirsE27.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/27/2004 | 1500 | 11/05/2004 | 1900 |
| 04/14/2004 | 1700 | 09/15/2004 | 1650 |
| Subject: | SGP/SIRS/E27 - incorrect tracking |
| DataStreams: | sgpsirsE27.00 |
| Description: | The solar tracker at E27 was not functioning properly. The problem affected tracker mounted instruments: downwelling diffuse 8-48 and direct normal pyrheliometer NIP. After tracker adjustment on 4/14/2004 1700GMT the tracker stopped tracking properly during afternoon hours. Attempts to correct tracker operation throughout the failure period resulted in variations on incorrect tracker operation. No replacement tracker was available. After adjustment on 9/15/2004 the tracker problem was resolved. It is unclear what, other than typical az and zen tracker software changes by field techs, corrected the problem. This problem period corresponds to the first time range specified (4/14 to 9/15). On 10/27/2004 a replacement tracker was installed at E27. Technical difficulties kept tracker out of service until 11/05/2004. The replacement tracker at E27 was put into serice by the field techs on 11/05/2004 1830GMT. The tracker has been tracking correctly since this time. This problem period corresponds to the second time range (10/27 to 11/05). |
| Measurements: | sgpsirsE27.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/10/2007 | 0000 | 12/25/2007 | 2359 |
| Subject: |
|
| DataStreams: | sgpsirsE27.00 |
| Description: | Ice storms affected the SGP central and extended facilities starting Dec 10 0000GMT to mid/late December. Each facility was affected at various times and degrees dependant on elevation, latitude and whether power failed for short or extended periods of time. By December 15th most ice had melted from the radiometers at all the faclities but power outages and tracker failures persisted at some stations. |
| Measurements: | sgpsirsE27.00:
|