DQR ID | Subject | Data Streams Affected | Data Quality Metric |
---|---|---|---|
D011127.34 | SGP EBBR E26 - Data Incorrect During 6 Month Checks | sgp30ebbrE26.b1 | Incorrect |
D011206.2 | SGP EBBR E26 - Battery Voltage Low | sgp30ebbrE26.b1 | Suspect |
D020716.18 | SGP/EBBR/E26 - 6 Month Checks | sgp30ebbrE26.b1 | Incorrect |
D020717.37 | SGP/EBBR/E26 - Measurements Zero | sgp30ebbrE26.b1 | Incorrect |
D020717.38 | SGP/EBBR/E26 - Measurements Incorrect | sgp30ebbrE26.b1 | Incorrect |
D020717.39 | SGP/EBBR/E26 - Multiplexer 2 Failure From High Temperature | sgp30ebbrE26.b1 | Suspect |
D021113.1 | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR Header | sgp30ebbrE26.b1 | Does not affect quality |
D021113.4 | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR Header | sgp30ebbrE26.b1 | Does not affect quality |
D030117.26 | SGP/EBBR/E26 - Measurements zero following logger restart | sgp30ebbrE26.b1 | Incorrect |
D030117.27 | SGP/EBBR/E26 - Multiplexer Problem | sgp30ebbrE26.b1 | Incorrect |
D050719.15 | SGP/EBBR/E26 - Improved EBBR CR10 Program | sgp30ebbrE26.b1 | Does not affect quality |
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
04/05/2001 | 1415 | 04/05/2001 | 1546 | Incorrect |
10/16/2001 | 1750 | 10/16/2001 | 1921 | Incorrect |
Subject: | SGP EBBR E26 - Data Incorrect During 6 Month Checks |
DataStreams: | sgp30ebbrE26.b1 |
Description: | The data was incorrect during the 6 month checks. |
Measurements: | sgp30ebbrE26.b1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
04/01/2001 | 0000 | 08/23/2001 | 1530 | Suspect |
Subject: | SGP EBBR E26 - Battery Voltage Low |
DataStreams: | sgp30ebbrE26.b1 |
Description: | The battery voltage often dropped below 10.5 volts. All data for voltages below 10.5 volts should be considered to be incorrect. See the 15 minute data files, which contain the battery voltage, to determine when the data was incorrect. |
Measurements: | sgp30ebbrE26.b1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
05/02/2002 | 1500 | 05/02/2002 | 1531 | Incorrect |
Subject: | SGP/EBBR/E26 - 6 Month Checks |
DataStreams: | sgp30ebbrE26.b1 |
Description: | The indicated measurements were incorrect during the 6 month checks. |
Measurements: | sgp30ebbrE26.b1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
05/30/2002 | 1500 | 05/30/2002 | 1501 | Incorrect |
Subject: | SGP/EBBR/E26 - Measurements Zero |
DataStreams: | sgp30ebbrE26.b1 |
Description: | The measurements are often zero after a CR10 datalogger restart, as occurred here. |
Measurements: | sgp30ebbrE26.b1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
05/30/2002 | 1530 | 05/30/2002 | 1531 | Incorrect |
Subject: | SGP/EBBR/E26 - Measurements Incorrect |
DataStreams: | sgp30ebbrE26.b1 |
Description: | Change of energy storage (CES) measurements (calculated from the change of soil temperature with time) are sometimes incorrect after a CR10 program restart because the beginning measurement of the averaging period is zero. Average soil heat flow, sensible heat flux, and latent heat flux were affected and cannot be recalculated. |
Measurements: | sgp30ebbrE26.b1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
06/01/2002 | 2115 | 06/30/2002 | 2356 | Suspect |
Subject: | SGP/EBBR/E26 - Multiplexer 2 Failure From High Temperature |
DataStreams: | sgp30ebbrE26.b1 |
Description: | Multiplexer 2 is failing during times of control box temperatures above 29 degrees C. The failure begins in the last channel and progresses to lower channels as the temperature increases. It has not yet been determined whether the failure is in the relays or a solid state component of the multiplexer. This condition is probably due to the aging of the device and the millions of cycles that this 10 year old device has made. More failures of this sort may occur in the future. A cure is being sought aside from replacement of the multiplexers to prevent the problem. The indicated measurements need to be inspected to determine which ones are usable. |
Measurements: | sgp30ebbrE26.b1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
04/01/2001 | 0000 | 06/18/2003 | 2359 | Does not affect quality |
Subject: | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR |
DataStreams: | sgp30ebbrE26.b1 |
Description: | The units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in the EBBR 30 minute netcdf header have been incorrect from the beginning of processing the data into netcdf files. The correct units are MJ/m^3/C. This does not affect the data quality. |
Measurements: | sgp30ebbrE26.b1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
12/01/1993 | 1200 | 06/18/2003 | 1159 | Does not affect quality |
Subject: | SGP/EBBR - Incorrect Units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in 30EBBR |
DataStreams: | sgp30ebbrE26.b1 |
Description: | The units for Soil Heat Capacity (cs1, cs2, cs3, cs4, cs5) in the EBBR 30 minute netcdf header have been incorrect from the beginning of processing the data into netcdf files. The correct units are MJ/m^3/C. This does not affect the data quality. (NOTE: The actual begin date of some of these data streams is as early as 7/4/93. This DQR applies to all 30m EBBR data.) |
Measurements: | sgp30ebbrE26.b1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
07/11/2002 | 1600 | 07/11/2002 | 1629 | Incorrect |
Subject: | SGP/EBBR/E26 - Measurements zero following logger restart |
DataStreams: | sgp30ebbrE26.b1 |
Description: | Most of the measurements were zero, which normally happens after a datalogger restart. |
Measurements: | sgp30ebbrE26.b1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
07/01/2002 | 0000 | 07/11/2002 | 1300 | Incorrect |
Subject: | SGP/EBBR/E26 - Multiplexer Problem |
DataStreams: | sgp30ebbrE26.b1 |
Description: | One of the multiplexers exhibited dropouts of the channels, beginning with the last channel at temperatures above about 30 C and moving backward through the channels as the temperature rose. High temperatures affected the switching speed of the multiplexer. This is the first time that this behavior has been documented in a Campbell Scientific multiplexer. The multiplexer had been in continuous field use for 10 years and had experienced probably more switching cycles than what is normally expected of the device in that period. The multiplexer was replaced to solve the problem. |
Measurements: | sgp30ebbrE26.b1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
04/01/2001 | 0000 | 03/31/2005 | 1700 | Does not affect quality |
Subject: | SGP/EBBR/E26 - Improved EBBR CR10 Program |
DataStreams: | sgp30ebbrE26.b1 |
Description: | Effective 20050331.1700, the EBBR.E26 CR10 program was revised to improve the quality of the primary measurements as follows: 1) An RMS procedure is used to determine max and min limits of acceptable soil heat flow. This is applied to the individual soil sets. Measurements outside the limits are rejected and the measurements within the limits are used to calculate the average soil heat flow. 2) Max and min limits are used to determine incorrect values of net radiation, sensible heat flux (h), latent heat flux (e), and automatic exchange mechanism (AEM) signal. If AEM signal is outside the limits, h and e are set to 999s. If net radiation is outside the limits, h and e are set to 999s. If h or e are outside the limits, h and e are set to 999s. Virtually no incorrect soil measurement will affect the primary measurements of h and e. By setting h and e to 999s, it can be easily seen that the primary variables are incorrect; no other interpretation is possible. Prior to 20050331, the improved CR10 program was NOT in effect. DQRs have been submitted for known instances of incorrect soil measurements which affected the quality of the primary measurements of h and e. Note: the DQR begin date is the begin date of the sgp30ebbrE26.b1 data stream. The earlier version of the CR10 program was also used on previous EBBR datastream names (e.g. sgp30ebbrE26.a1). ~ |
Measurements: | sgp30ebbrE26.b1:
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