DQR ID | Subject | Data Streams Affected |
---|---|---|
D000518.1 | SGP/TWR/C1 - 25m Problems with RH probe | sgp1twr25mC1.a0, sgp30twr25mC1.a1, sgp1440twr25mC1.a0 |
D070208.1 | SGP/TWR/C1 - Missing data | sgp1twr25mC1.a0, sgp30twr25mC1.a1, sgp1440twr25mC1.a0 |
D960509.1 | SGP/TWR25m/C1 - Reprocess: Global Metadata Error | sgp1twr25mC1.a0, sgp30twr25mC1.a1, sgp1440twr25mC1.a0 |
D960611.1 | SGP/TWR/C1 - 25m and 60m T/RH Calibration | sgp1twr25mC1.a0, sgp1twr60mC1.a0, sgp30twr25mC1.a1, sgp30twr60mC1.a1, sgp1440twr25mC1.a0, sgp1440twr60mC1.a0 |
D961111.2 | SGP/TWR/C1 - Reprocess: RH recalibration | sgp1twr25mC1.a0, sgp1twr60mC1.a0, sgp30twr25mC1.a1, sgp30twr60mC1.a1, sgp1440twr25mC1.a0, sgp1440twr60mC1.a0 |
D970314.2 | SGP/TWR/C1 - RH Probe affected by tower damage | sgp1twr25mC1.a0, sgp1twr60mC1.a0, sgp30twr25mC1.a1, sgp30twr60mC1.a1, sgp1440twr25mC1.a0, sgp1440twr60mC1.a0 |
D970605.1 | SGP/TWR/C1 - Reprocess: 25m and 60m T/RH Comm Lines Switched | sgp1twr25mC1.a0, sgp1twr60mC1.a0, sgp30twr25mC1.a1, sgp30twr60mC1.a1 |
D970925.1 | SGP/TWR/C1 - 25m Low battery voltage affected data | sgp1twr25mC1.a0, sgp30twr25mC1.a1 |
D970925.2 | SGP/TWR/C1 - Incorrect temperature coefficient | sgp1twr25mC1.a0, sgp30twr25mC1.a1 |
D971027.4 | SGP/TWR/C1 - SE 25m RH Incorrect | sgp1twr10xC1.a1, sgp1twr10xC1.b1, sgp30twr10xC1.a1, sgp30twr10xC1.b1 |
D980114.2 | SGP/TWR/C1 - Tower lowered for maintenance | sgp1twr25mC1.a0, sgp1twr60mC1.a0, sgp30twr25mC1.a1, sgp30twr60mC1.a1, sgp1440twr25mC1.a0, sgp1440twr60mC1.a0 |
D980528.11 | SGP/TWR/C1 - Tower SE-side lowered for maintenance | sgp1twr10xC1.a1, sgp1twr10xC1.b1, sgp30twr10xC1.a1, sgp30twr10xC1.b1 |
D990415.5 | SGP/TWR/C1 - Missing data | sgp1twr60mC1.a0, sgp30twr60mC1.a1, sgp1440twr60mC1.a0 |
D990421.1 | SGP/TWR/C1 - Missing data | sgp1twr10xC1.a1, sgp1twr10xC1.b1, sgp30twr10xC1.a1, sgp30twr10xC1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/25/1996 | 2200 | 04/03/1996 | 1630 |
Subject: | SGP/TWR/C1 - 25m Problems with RH probe |
DataStreams: | sgp1twr25mC1.a0, sgp30twr25mC1.a1, sgp1440twr25mC1.a0 |
Description: | Site Operations replaced the 25m RH probe on 25 March 1996. I have reviewed the T/RH data from the 25 meter level and find that the RH sensor was working, but that the 25m RH did not compare favorably with the 60m RH, or EBBR RH data. An error in the sensitivity of the 25m RH can be seen for the whole range of RH. A comparison of data showed that 25m RH was 19% too low for RH < 80%, 18% too low for RH between 80% and 85%, and 17% too low for RH > 85%. Thus calculated vapor pressures were also too low. With this information, adjustments can be made (by the user) in the data from March 25 through 2 April. On April 2 and 3, 1996, I was assisted by Chris Martin in testing the 25m RH probe. We lowered the 25 and 60 meter tower carriages to the surface. The RH data from 2 April at 1607 to 2240 GMT for both 25 and 60m levels was taken at about 2 to 3 meters above the surface. Furthermore, much of the T/RH/Aspirator data is corrupted because of tests; data from this period is incorrect. A multiplier of 1.04 was applied to the 25 meter RH data for the period 2 April at 2240 GMT to 3 April at 1700 GMT; therefore, for this short period, a different adjustment by the data user is needed (multiply 25m RH by 1.144 for RH < 80%, by 1.135 for RH between 80% and 85%, and by 1.125 for RH > 85%). On April 3, 1996 at 1700 GMT I increased the 25m RH multiplier to 1.19. Thereafter, the 25m RH values must be decreased by 1% for RH between 80% and 85%, and decreased 2% for RH > 85%. The slight non-linearity of this type of RH probe at greater than 80% RH is exaggerated for this probe by it not being properly electronically calibrated. Using the information above, the RH values above 80% can be adjusted to within 1% of the accuracy that would be obtained from a factory calibration. |
Measurements: | sgp1twr25mC1.a0:
sgp1440twr25mC1.a0:
sgp30twr25mC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/20/1996 | 2301 | 06/27/1996 | 0432 |
08/12/1996 | 1744 | 08/27/1996 | 0158 |
Subject: | SGP/TWR/C1 - Missing data |
DataStreams: | sgp1twr25mC1.a0, sgp30twr25mC1.a1, sgp1440twr25mC1.a0 |
Description: | Data are missing and unrecoverable. |
Measurements: | sgp1twr25mC1.a0:
sgp1440twr25mC1.a0:
sgp30twr25mC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/08/1996 | 0000 | 05/09/1996 | 2359 |
Subject: | SGP/TWR25m/C1 - Reprocess: Global Metadata Error |
DataStreams: | sgp1twr25mC1.a0, sgp30twr25mC1.a1, sgp1440twr25mC1.a0 |
Description: | The sensor_height global attribute field of the 25 meter data (1 minute, 30 minute, daily) lists the height as "60m" instead of "25m". No data values are impacted by this error. |
Measurements: | sgp1twr25mC1.a0:
sgp1440twr25mC1.a0:
sgp30twr25mC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/03/1996 | 1700 | 05/21/1996 | 1600 |
Subject: | SGP/TWR/C1 - 25m and 60m T/RH Calibration |
DataStreams: | sgp1twr25mC1.a0, sgp1twr60mC1.a0, sgp30twr25mC1.a1, sgp30twr60mC1.a1, sgp1440twr25mC1.a0, sgp1440twr60mC1.a0 |
Description: | The T and RH measurements at the 60 m tower level may need to be adjusted for times between the period listed above; this is concluded from calibrations/checks of the T/RH data during 21-24 May 1996. On May 21-23, the 25 and 60 meter level west carriages were located at the surface for installation of the ECOR C1 system and calibrations/checks of the T/RH sensors. ECOR installation took place primarily on 21 May. A table at the bottom of this text gives recommendations concerning use of the data from the period above, based on the data during the period and the condition of the T/RH sensors as found on 22-23 May 1996. I planned recalibration/checks of the 25 m and 60 m level T/RH sensors in conjunction with a trip to the Central Facility to observe ECOR C1 installation and training. The 60 m T data began to show signs of deterioration of accuracy after 20 April 1996. This became most noticeable by 25 April as the occurrence of transitional periods (as determined from comparison of the 25 and 60 m T) became marginal. The 60 m temperature appeared to be too low most of the time. At the same time, the 60 m RH appeared to be too high. It is difficult to determine what the actual difference between sensors is when the carriages are at the 25 and 60 m levels, especially if one temperature sensor is reporting incorrectly. The RH sensor measurements can be compared fairly easily during the day to night transition period (as determined from the temperatures at the two levels) as a difference in temperature of about 0.7 degrees corresponds to an RH difference of about 5%; smaller differences in each are proportional; when the temperatures are within about 0.1 degree, the RH should be within about 1%. Careful study of the data during the transition time (which varies as to time of day during the year) allows me to determine the quality of the measurements. The ECOR C1 installation provided the perfect opportunity to compare the T/RH sensors for a long period of time when the data would have been incorrect anyway. With the carriages and sensors at the tower base, the RH and temperature sensors were compared on 22 May. The 60 m RH probe indicated an average of 62% while the 25 m RH probe and an aspirated psychrometer indicated 51%. The multiplier in the 60 m CR21X program (1.14) accounted for all but 4% of the difference. An interesting, but confusing, sidenote to this is that the multiplier that I entered on 3 April 1996 was 1.19; I did not have time before I left the CF to change the factor in the storage module from 1.14 to 1.19. I submitted a work request to site operations to have the program with 1.19 multiplier downloaded manually from the CR21X to the storage module (a precaution in case power to the logger was lost and the logger would have to restart from the storage module). However, the program download apparently did not work, as at some later time (or perhaps at the time of the download attempt) the program with the 1.14 factor in the storage module was uploaded to the CR21X. No power outages are known to have occurred thereafter that would have caused uploading of the storage module program to the datalogger (which would have resulted in the 1.14 multiplier ending up in the CR21X), except on 21 May 1996 from 2027 to 2127 GMT. At this time, Site Operations had to disconnect the AC charger unit for the CR21X machines to permit the installation of other devices related to the ECOR C1 installation. However, the CR21X battery voltage did not drop low enough for ceasation of the on-board program. Since RH frequently decreases more than 5% between half hour values and sometimes does so between one minute values, it is impossible to tell when the multiplier changed from 1.19 to 1.14. If it appears to the data user that the 25 m RH is low, it could be multiplied by 1.19/1.14=1.044. It may be more appropriate to use the smaller multiplier, since the RH sensor output was drifting upwards anyway. By the end of the period above, the 60 meter RH should be be decreased by a factor of 1.2. Even though the actual difference between the 25 and 60 m RH probes (with a multiplier of 1.0 for both), at the tower base, was only about 4% (within their combined specifications), we removed 60 m RH probe S/N 109 and replaced it with RH probe S/N 234 at 1940 GMT on 22 May. S/N 234 indicated, on average, 55% while the 25 m RH probe and the aspirated psychrometer indicated 51%. These were the same results obtained with the previous RH sensor. Instead of switching back to the original RH sensor, S/N 234 was left on. The instruments were left at the tower base overnight to compare the T and RH from the two levels. Over a range of RH of 50% to 81% the ratio of 25 m to 60 m RH was incredibly consistent at 0.911. Therefore, on 23 May at 2000 GMT, a multiplier of 0.911 was entered in the CR21X program for the 60 m RH. This was justified by comparisons with the psychrometer that indicated that the 25 m RH sensor agreed with the psychrometer. The overnight comparison also showed what manual measurements on May 22 had, that the 60 m temperature sensor was indicating low. An ice bath test of the 25 and 60 m PRTds showed that both were within 0.1 degrees of zero. At ambient T (30 deg. C), the 25 m sensor and the psychrometer agreed, but the 60 m PRTD indicated 1.5 degrees low. Changes in calibration slope of PRTD sensors are not common, but are possible if the actual sensing element is moved inside the stainless steel jacket. Since most of the change in calibration appears to have happened within a week in late April, it is possible that tower vibration may have been the cause. Again, it is not possible to easily quantify how the 60 m T data should be adjusted from 3 April until 21 May. For several consecutive half hours on 22 May, while both levels of sensors were at the tower base, the 60 m T actually indicated a greater temperature than the 25 m level T sensor (and the 60 m RH was lower than the 25 m level). Such erratic behavior precludes being able to make any recommendation for adjustment of the 60 m T beyond 20 April (or for the 60 m RH beyond 8 May). The 60 m temperature sensor was replaced at 1559 GMT on 23 May. An ice bath was used to determine the proper Rs/Ro and an ambient comparison between the 25 m and 60 m PRTDs and the psychrometer was performed. All agreed within 0.15 degrees over a couple of hours. The tower carriages were then elevated to their normal positions at 25 and 60 meters. The next morning the data from the two levels and the SMOS were compared and found to produce reasonable gradients and mean values. A review of the data since that time continues to show that the data quality is excellent. Side by side comparison of the two sets of sensors over an extended period of time (overnight) allows the best evaluation of performance; this technique will continue to be used in the future in the interest of ensuring data quality. One footnote to the T/RH checks/calibrations is that the aspirator threshhold level was reset to 2200 mv for both 25 m and 60 m aspirators. This appears to be the optimum threshhold for both levels at this time; the threshhold cannot be an unchangeable value, as it varies dependent on length of cable on the tower and age and condition of the flow sensor and aspirator fan. I have to continually evaluate the effectiveness of the threshhold and adjust it when appropriate, a result of the sensor being a variable output device, as opposed to the on/off switch type that is used by some manufacturers. Table of 60 m Data Usage Temperature: 3 Apr - 20 Apr no adjustments 20 Apr - 21 May no recommendation Relative Humidity: 3 Apr - 8 May no adjustments 8 May - 21 May no recommendation |
Measurements: | sgp1twr25mC1.a0:
sgp30twr60mC1.a1:
sgp1twr60mC1.a0:
sgp1440twr25mC1.a0:
sgp30twr25mC1.a1:
sgp1440twr60mC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/23/1996 | 0000 | 10/21/1996 | 1830 |
Subject: | SGP/TWR/C1 - Reprocess: RH recalibration |
DataStreams: | sgp1twr25mC1.a0, sgp1twr60mC1.a0, sgp30twr25mC1.a1, sgp30twr60mC1.a1, sgp1440twr25mC1.a0, sgp1440twr60mC1.a0 |
Description: | Comparisons of the RH probes with Oklahoma Mesonet probes in the laboratory and comparisons of the RH probes with the EBBR over a four day period after the Water Vapor IOP indicate the TOWER RH probes were incorrectly calibrated. Corrections required are summarized below. 60 meter level: RH data greater than 85% are incorrect for 23 May 1996 through 10 September 2000 GMT. RH data for 10 September 2330 GMT through 13 September 2130 GMT can be corrected with the following equation: -1.6 + 0.955*RH for original RH of 83% or less. Original RH values of greater than 83% cannot be adequately corrected. RH data for 14 September 0000 GMT through 30 September 2000 GMT can be corrected with the equation: -1.6 + 0.87*RH for original RH of 83% or less. Original RH values of greater than 83% cannot be adequately corrected. RH data for 30 September 2030 GMT through 21 October 1830 GMT can be corrected with the equation: 0.3 + 1.107*RH for original RH of 85% or less. Original RH values of greater than 85% cannot be adequately corrected. 25 meter level: RH data greater than 90% are incorrect for 23 May 1996 through 10 September 2000 GMT. RH data for 10 September 0000 GMT through 21 October 1830 GMT can be corrected with the equation: 4.098 + 0.953*RH for original RH of 90% or less. Original RH values of greater than 90% cannot be adequately corrected. Vapor pressure is also incorrect because RH was incorrect. Recalculate vapor pressure from the recalibrated RH. |
Measurements: | sgp1twr25mC1.a0:
sgp30twr60mC1.a1:
sgp1twr60mC1.a0:
sgp1440twr25mC1.a0:
sgp30twr25mC1.a1:
sgp1440twr60mC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/22/1996 | 1730 | 02/05/1997 | 1400 |
Subject: | SGP/TWR/C1 - RH Probe affected by tower damage |
DataStreams: | sgp1twr25mC1.a0, sgp1twr60mC1.a0, sgp30twr25mC1.a1, sgp30twr60mC1.a1, sgp1440twr25mC1.a0, sgp1440twr60mC1.a0 |
Description: | On Feb. 3 and 4 the SGP CART 60 m tower western elevator was repaired. This included the replacement of cables on the 60 m carriage and connectors on the 25 m carriage. Although damaged, the 60 m carriage cable had been temporarily repaired by Site Operations several months ago, with apparent success. However, evidence since then suggests that the repair was not totally successful. Tests since then suggest that the low return for the RH sensor may have been floating, or at least the connection was poor. At the same time, the 25 m carriage connectors and tower receptacles were bent in planes perpendicular to each other, apparently resulting in the same condition as existed for the 60 m carriage. The damage was partially the result of improper routing of the cables on the 60 m carriage by the tower installer and partially the result of improper parking of the carriages (damaging the 25 m carriage connectors and receptacles). The cables were reoriented and the connectors and receptacles replaced by the tower installer on 3-4 Feb 97. Because of the damage to the 25 m carriage connectors, the 25 m carriage was left off of the tower and no correct data was collected from the 25 m level from 22 Oct 97 at 1730 GMT until 4 Feb 97 at 1400 GMT. Only the 60 m level reported useful data during this period. During this period a slope of 1.107 was applied in the datalogger programming before the 60 m RH value was output to the logger memory. Calibrations of the probe by Vaisala last month show that the logger slope was appropriate for the sensor behavior at RH less than 85%. Calibration of sensors SN 109 and 231 by Vaisala showed the outputs to be several percent low near 0% RH and nearly correct at 100%. The calibrations by the original manufacturer caused the outputs to be outside the specifications for the bottom 3/4 of the sensors' range. Vaisala adjusted the slope and offset for both sensors. In use at 60 m on the tower, the RH probe slope changed above 85% RH, becoming larger with increasing RH. At saturation the 60 m sensor RH value was being reported as 110.7% to 111.0% (in other words the slope in the logger of 1.107 X 100%). Apparently, at higher voltages the poor low side connection was less of a factor in the voltage output by the probe. Comparison with sonde data for RH above 85% yields the correction in the next paragraph. Therefore, my recommendation for the period listed above is to use the 60 m RH data as is for RH less than 85%. Reported RH above 85% can be roughly corrected with the following: actual RH = 36 + 0.577 X (60 m reported RH) . Vapor pressure can then be recalculated by the user from the correct RH values and the temperature. On Feb. 4 and 5, I conducted a number of tests on the carriages and RH probes (SN 231 at 25 m, SN 109 at 60 m), then replaced the RH probes with the probes recently (SN 234 at 25 m, SN 226 at 60 m) calibrated by Vaisala. One minute 60 m T and RH data is extremely consistent with the data from the sonde at 60 m height since 5 Feb 1997. In fact, the comparisons have never been better, reflecting the problem with obtaining correct calibrations from the original manufacturer (even before the tower was damaged), and the problems created by the damage on the tower. The problems resulting from damage to the tower carriage cables and connectors began around June 1995 (although the 60 m AC cable and 25 m receptacles had been damaged at least twice previously). I made a number of corrections to the RH data between June 1995 and when the tower was repaired this past February. 25 and 60 m T and RH data since the tower repairs and the Feb. 5, 1997 replacement of the RH probes are very consistent with the sonde data. The only significant difference between the 60 m RH probe and the sonde RH probe occurs when the surface to 60 m RH gradient is large; this is expected since the RH probe on the sonde cannot respond to large changes in gradient quickly enough to produce the same measurement as the 60 m tower RH probe. I will continue to compare the sonde, SMOS, and tower sensors for data quality purposes, as I have routinely for the past year. |
Measurements: | sgp1twr25mC1.a0:
sgp30twr60mC1.a1:
sgp1twr60mC1.a0:
sgp1440twr25mC1.a0:
sgp30twr25mC1.a1:
sgp1440twr60mC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/03/1997 | 1630 | 05/28/1997 | 2110 |
Subject: | SGP/TWR/C1 - Reprocess: 25m and 60m T/RH Comm Lines Switched |
DataStreams: | sgp1twr25mC1.a0, sgp1twr60mC1.a0, sgp30twr25mC1.a1, sgp30twr60mC1.a1 |
Description: | On 3 March 1997 an activity of unknown nature took place at SGP, causing the communication lines to the 25 and 60 meter T/RH to be switched. The data indicates that the switch occurred between 1630 and 1700 GMT. I submitted a work request to site operations to determine if the two levels were switched; they found that they were, as I suspected. It is not clear where this occurred, although we do know that it did not happen at the tower CR21X dataloggers location. The communication lines were temporarily "switched back" at the logger location on May 28 at 2110 GMT until it can be determined where the switch was actually made. |
Measurements: | sgp1twr25mC1.a0:
sgp30twr60mC1.a1:
sgp1twr60mC1.a0:
sgp30twr25mC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/02/1997 | 2004 | 09/04/1997 | 2057 |
Subject: | SGP/TWR/C1 - 25m Low battery voltage affected data |
DataStreams: | sgp1twr25mC1.a0, sgp30twr25mC1.a1 |
Description: | Shortly after 2003 GMT on 2 September 1997 a GFCI circuit breaker tripped in the tower base AC box, resulting in a drop in CR21X voltage of 0.4 volts in seven minutes. This resulted in a steady drop in battery voltage for the next 30 hours, and incorrect, out of range, or missing values for temp, rh, and vap_pres. |
Measurements: | sgp1twr25mC1.a0:
sgp30twr25mC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/04/1997 | 2058 | 09/25/1997 | 2100 |
Subject: | SGP/TWR/C1 - Incorrect temperature coefficient |
DataStreams: | sgp1twr25mC1.a0, sgp30twr25mC1.a1 |
Description: | When the power was restored to the TWR25m following a battery failure, the program downloaded to the logger had an old coefficient in it for temperature (1.0043; should be 1.0041). The difference in temperature reported was less than 0.05 degrees; this data does not need to be corrected. Site Operations corrected the coefficient on 25 September 1997. |
Measurements: | sgp1twr25mC1.a0:
sgp30twr25mC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/12/1997 | 0000 | 09/26/1997 | 2047 |
Subject: | SGP/TWR/C1 - SE 25m RH Incorrect |
DataStreams: | sgp1twr10xC1.a1, sgp1twr10xC1.b1, sgp30twr10xC1.a1, sgp30twr10xC1.b1 |
Description: | The RH and therefore vapor pressure measurements on the 25 meter level, southeast side of the 60 m tower (data from CR10X) were incorrect because the relative humidity portion of the T/RH probe malfunctioned. It is unknown at what day and time the failure occurred (it should be obvious from the data), although it was in the middle of the Fall combined IOP; I was not receiving the data at the time. The T/RH probe was replaced on 26 September. |
Measurements: | sgp30twr10xC1.a1:
sgp1twr10xC1.a1:
sgp1twr10xC1.b1:
sgp30twr10xC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/21/1996 | 1530 | 05/24/1996 | 1700 |
05/01/1997 | 1724 | 05/01/1997 | 1911 |
05/09/1997 | 1454 | 05/09/1997 | 1501 |
08/05/1997 | 1804 | 08/05/1997 | 2012 |
08/13/1997 | 1600 | 08/14/1997 | 1602 |
09/10/1997 | 1915 | 09/10/1997 | 1950 |
09/11/1997 | 1300 | 09/11/1997 | 2230 |
09/26/1997 | 2010 | 09/26/1997 | 2047 |
12/19/1997 | 2058 | 12/19/1997 | 2211 |
01/27/1998 | 1750 | 01/27/1998 | 1840 |
03/13/1998 | 1648 | 03/13/1998 | 1725 |
03/13/1998 | 1933 | 03/13/1998 | 2020 |
04/24/1998 | 1416 | 04/24/1998 | 1504 |
05/22/1998 | 1359 | 05/22/1998 | 1443 |
07/16/1998 | 1442 | 07/16/1998 | 1512 |
10/15/1998 | 1329 | 10/15/1998 | 1530 |
10/16/1998 | 1346 | 10/16/1998 | 1530 |
Subject: | SGP/TWR/C1 - Tower lowered for maintenance |
DataStreams: | sgp1twr25mC1.a0, sgp1twr60mC1.a0, sgp30twr25mC1.a1, sgp30twr60mC1.a1, sgp1440twr25mC1.a0, sgp1440twr60mC1.a0 |
Description: | The west-side tower elevators were lowered for maintenance and/or data are offscale during routine maintenance. |
Measurements: | sgp1twr25mC1.a0:
sgp30twr60mC1.a1:
sgp1twr60mC1.a0:
sgp1440twr25mC1.a0:
sgp30twr25mC1.a1:
sgp1440twr60mC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/26/1997 | 2010 | 09/26/1997 | 2047 |
10/24/1997 | 1746 | 10/24/1997 | 1823 |
05/01/1998 | 1827 | 05/01/1998 | 1936 |
05/18/1998 | 1947 | 05/18/1998 | 2106 |
07/16/1998 | 1442 | 07/16/1998 | 1512 |
08/03/1998 | 1904 | 08/03/1998 | 2035 |
08/06/1998 | 1918 | 08/06/1998 | 1939 |
12/08/1998 | 2107 | 12/08/1998 | 2200 |
05/19/1999 | 1755 | 05/19/1999 | 1915 |
07/02/1999 | 1720 | 07/02/1999 | 1735 |
09/07/1999 | 1610 | 09/07/1999 | 1641 |
09/15/1999 | 1353 | 09/15/1999 | 1536 |
09/15/1999 | 1750 | 09/15/1999 | 1850 |
09/16/1999 | 1846 | 09/16/1999 | 1933 |
11/15/1999 | 2011 | 11/15/1999 | 2220 |
11/16/1999 | 1701 | 11/16/1999 | 1827 |
11/18/1999 | 1621 | 11/18/1999 | 1748 |
11/19/1999 | 1415 | 11/19/1999 | 1615 |
01/06/2000 | 1942 | 01/06/2000 | 2127 |
08/14/2000 | 1447 | 08/14/2000 | 2138 |
11/27/2000 | 1842 | 11/27/2000 | 2016 |
11/29/2000 | 1400 | 11/29/2000 | 1446 |
05/04/2001 | 1839 | 05/04/2001 | 1855 |
05/14/2001 | 1454 | 05/14/2001 | 1507 |
05/18/2001 | 1707 | 05/18/2001 | 1720 |
07/12/2001 | 2103 | 07/12/2001 | 2136 |
07/13/2001 | 2018 | 07/13/2001 | 2141 |
07/20/2001 | 1451 | 07/20/2001 | 1657 |
08/07/2001 | 1343 | 08/07/2001 | 1841 |
08/08/2001 | 1356 | 08/08/2001 | 1901 |
09/26/2001 | 1834 | 09/26/2001 | 2122 |
09/27/2001 | 1504 | 09/27/2001 | 1918 |
10/02/2001 | 1549 | 10/02/2001 | 1610 |
10/02/2001 | 2006 | 10/02/2001 | 2103 |
10/04/2001 | 1828 | 10/04/2001 | 1913 |
11/12/2001 | 2050 | 11/12/2001 | 2110 |
12/19/2001 | 2055 | 12/19/2001 | 2121 |
04/11/2002 | 2003 | 04/11/2002 | 2131 |
08/01/2002 | 1330 | 08/01/2002 | 2201 |
08/02/2002 | 1354 | 08/02/2002 | 1912 |
09/03/2002 | 1937 | 09/03/2002 | 2032 |
09/10/2002 | 1734 | 09/10/2002 | 1843 |
10/24/2002 | 1418 | 10/24/2002 | 1436 |
10/25/2002 | 1806 | 10/31/2002 | 1621 |
10/31/2002 | 1914 | 10/31/2002 | 2209 |
11/06/2002 | 1552 | 11/06/2002 | 1804 |
11/06/2002 | 2017 | 11/06/2002 | 2222 |
11/07/2002 | 1557 | 11/07/2002 | 1731 |
12/16/2002 | 1631 | 12/16/2002 | 1710 |
12/18/2002 | 2037 | 12/18/2002 | 2140 |
01/30/2003 | 1655 | 01/30/2003 | 1814 |
02/21/2003 | 1955 | 02/21/2003 | 2057 |
02/22/2003 | 1917 | 02/22/2003 | 2110 |
03/17/2003 | 1622 | 03/17/2003 | 1704 |
03/21/2003 | 1825 | 03/21/2003 | 2027 |
08/14/2003 | 1445 | 08/14/2003 | 1521 |
08/14/2003 | 1902 | 08/14/2003 | 1937 |
08/15/2003 | 1344 | 08/15/2003 | 1945 |
08/19/2003 | 1416 | 08/19/2003 | 1604 |
10/06/2003 | 1713 | 10/06/2003 | 1828 |
Subject: | SGP/TWR/C1 - Tower SE-side lowered for maintenance |
DataStreams: | sgp1twr10xC1.a1, sgp1twr10xC1.b1, sgp30twr10xC1.a1, sgp30twr10xC1.b1 |
Description: | The SE-side carriage was lowered for maintenance and/or data values are off-scale during maintenance. |
Measurements: | sgp30twr10xC1.a1:
sgp1twr10xC1.a1:
sgp1twr10xC1.b1:
sgp30twr10xC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/18/1996 | 2105 | 02/20/1996 | 0057 |
06/21/1996 | 0643 | 06/26/1996 | 2241 |
10/26/1997 | 2206 | 10/28/1997 | 0100 |
Subject: | SGP/TWR/C1 - Missing data |
DataStreams: | sgp1twr60mC1.a0, sgp30twr60mC1.a1, sgp1440twr60mC1.a0 |
Description: | Data are missing and unrecoverable. |
Measurements: | sgp30twr60mC1.a1:
sgp1twr60mC1.a0:
sgp1440twr60mC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/18/1997 | 0036 | 09/22/1997 | 0130 |
08/21/1998 | 2004 | 09/18/1998 | 1538 |
10/31/1998 | 1104 | 11/03/1998 | 1500 |
08/08/1999 | 0000 | 08/08/1999 | 2359 |
10/18/2000 | 1504 | 10/20/2000 | 1150 |
12/16/2000 | 0000 | 12/18/2000 | 1214 |
02/08/2002 | 0443 | 02/19/2002 | 1615 |
02/22/2002 | 1739 | 02/25/2002 | 1918 |
03/09/2002 | 2002 | 03/11/2002 | 2001 |
12/14/2002 | 0702 | 12/16/2002 | 1330 |
10/06/2003 | 1702 | 10/08/2003 | 1401 |
Subject: | SGP/TWR/C1 - Missing data |
DataStreams: | sgp1twr10xC1.a1, sgp1twr10xC1.b1, sgp30twr10xC1.a1, sgp30twr10xC1.b1 |
Description: | Data are missing and unrecoverable. |
Measurements: | sgp30twr10xC1.a1:
sgp1twr10xC1.a1:
sgp1twr10xC1.b1:
sgp30twr10xC1.b1:
|