Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
12/07/1994 | 0430 | 12/07/1994 | 0800 | Incorrect |
Subject: | SGP/EBBR/E26 - Wind Direction Sensor Affect on Soil Moisture 2 |
DataStreams: | sgp30ebbrE26.b1, sgp5ebbrE26.b1, sgp15ebbrE26.b1 |
Description: | I have written a number of previous PIFs and DQRs about this same problem previously. This occurred most recently at E9, Ashton, KS in August 1994. The wind direction sensor is on the same data acquisition system multiplexer pair as soil moisture sensor 2. Sometimes a malfunctioning wind direction sensor (resulting in a constant wind direction of 135 degrees) will cause the soil moisture 2 measurement to be offscale. Between 0430 and 0800 GMT the wind direction sensor did not function properly at E22, Cordell, KS. As has often been the case, soil moisture measurements were affected for a shorter time period, from 0500 through 0730 GMT. The cause of this problem is unknown and only occurs on the multiplexer pair to which the wind direction sensor is connected, not on any other pair to which a soil moisture sensor is attached. None of the manufacturers of the applicable equipment can explain the problem. As done before, I will monitor the data for further occurrences of this condition; if the frequency of occurrence increases, further action will be taken. The following data and times are incorrect: Winds: 0430-0800 GMT 5 minute: wind_d, sigma_wd, res_ws 15 minute: mv_wind_d 30 minute: wind_d, sigma_wd, res_ws Soil Moisture 2: 0500-0730 GMT 15 minute: r_sm2 30 minute: sm2, c_shf2, cs2, ces2, g2, ave_shf, h, e |
Suggestions: | |
Measurements: | sgp5ebbrE26.b1: more
sgp15ebbrE26.b1: more sgp30ebbrE26.b1: more |