DQR ID | Subject | Data Streams Affected |
---|---|---|
D080304.3 | NIM/MET/M1 - ORG underestimated precipitation | nimmetM1.b1 |
D081022.11 | NIM/MET/M1 - Wind Speed data contain offset due to induced voltage | nimmetM1.b1 |
D091217.1 | NIM/MET/M1 - PWD cumulative precipitation incorrect | nimmetM1.b1 |
D091217.2 | NIM/MET/M1 - PWD 1 minute rainfall data suspect | nimmetM1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/06/2006 | 0000 | 01/06/2007 | 2359 |
Subject: | NIM/MET/M1 - ORG underestimated precipitation |
DataStreams: | nimmetM1.b1 |
Description: | The ORG underestimated precipitation by about 38% during the entire NIM deployment. No troubleshooting technique or replacement of gauge was successful in correcting the problem. |
Measurements: | nimmetM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/06/2006 | 0000 | 01/07/2007 | 2359 |
Subject: | NIM/MET/M1 - Wind Speed data contain offset due to induced voltage |
DataStreams: | nimmetM1.b1 |
Description: | The marine model of the RM Young wind sensor needs twisted pair shielded cable. The manufacturer did not originally supply the pigtail with twisted pair shielded cable. Use of twisted pair shielded cable for the rest of the cable run to the logger was also not specified. This caused an induced voltage in the wind speed line from the wind direction excitation. The induced voltage varied from sensor to sensor and probably changed anytime the cable was replaced or parts of the wind sensor were repaired or replaced. The induced voltage has been seen to vary from 0.15 m/s to as much as 1.08 m/s. |
Measurements: | nimmetM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/31/2006 | 0000 | 07/31/2006 | 2359 |
Subject: | NIM/MET/M1 - PWD cumulative precipitation incorrect |
DataStreams: | nimmetM1.b1 |
Description: | The Present Weather Detector is a serial sensor. The MET system datalogger reads in the data from this sensor. During the time in question serial comms problems were causing the data from the sensor to be read incorrectly. The data for one variable showed up in data for another variable or not at all. We reprocessed the data to correct as much of this error as we could. The cumulative rainfall variable was calculated from the instantaneous rainfall variable during reprocessing. Since we cannot be entirely sure all cumulative rainfall values are correct or were completely captured the cumulative rainfall data is considered to be unreliable. This issue shows up when comparing the cumulative rainfall data at the end of the day 07/31/2006 (79.08) and the beginning of the next day 08/01/2006 (3.17). Clearly we were either under or over-estimating the cumulative rainfall. |
Measurements: | nimmetM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/31/2006 | 0000 | 07/31/2006 | 2359 |
Subject: | NIM/MET/M1 - PWD 1 minute rainfall data suspect |
DataStreams: | nimmetM1.b1 |
Description: | The Present Weather Detector is a serial sensor. The MET system datalogger reads in the data from this sensor. During the time in question serial comms problems were causing the data from the sensor to be read incorrectly. The data for one variable showed up in data for another variable or not at all. We reprocessed the data to correct as much of this error as we could. We cannot be entirely certain that all rainfall values are correct or were captured properly. It is possible that some values were missed completely. |
Measurements: | nimmetM1.b1:
|