Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
08/19/1994 | 0100 | 08/23/1994 | 1530 | Incorrect |
Subject: | SGP/EBBR/E9 - Malfunctioning Wind Dir Sensor, Incorrect SM2 Results |
DataStreams: | sgp5ebbrE9.b1, sgp30ebbrE9.b1, sgp15ebbrE9.b1 |
Description: | It has been reported previously that a malfunction of the wind direction sensor resulting in zero or 135 degree outputs can cause the soil moisture #2 sensor to read offscale. The two sensors are attached to a multiplexer pair. The manufacturer of the multiplexer and data acquisition system have not been able to explain how our instrument configuration can cause this effect. Shortly after 0030 GMT on August 20, 1994 significant rainfall occurred, being reflected in more than a doubling of soil moisture within an hour. During the time period listed above, the wind direction sensor mulfunctioned (apparently caused by water in the wind direction sensor electronics), causing the following data fields to be incorrect: 5 minute: res_ws, wind_d, sigma_wd 15 minute: mv_wind_dir 30 minute: res_ws, wind_d, sigma_wd. During part of the listed period, Soil Moisture #2 was also incorrect, being offscale; during those times the following 30 minute data is also incorrect: 30 minute: sm2, c_shf2, ave_shf, cs2, ces2, g2, h, e. |
Suggestions: | |
Measurements: | sgp30ebbrE9.b1: more
sgp15ebbrE9.b1: more sgp5ebbrE9.b1: more |