Data Quality Reports for Session: 120844 User: yan Completed: 07/17/2009


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D080617.1TWP/SMET/C2 - ORG rainfall measurements too largetwpsmet60sC2.b1
D081022.5TWP/SMET/C2 - Wind Speed data contain offset due to induced voltagetwpsmet60sC2.b1


DQRID : D080617.1
Start DateStart TimeEnd DateEnd Time
05/08/2008000008/07/20082300
Subject:
TWP/SMET/C2 - ORG rainfall measurements too large
DataStreams:twpsmet60sC2.b1
Description:
The ORG was collecting large amounts of rainfall compared to the co-located tipping bucket 
raingauge.  The cable was chewed by mice causing the wires to make contact 
intermittently mimicking rainfall.
Measurements:twpsmet60sC2.b1:
  • Precipitation maximum(precip_max)
  • Precipitation mean(precip_mean)
  • precipitation minimum(precip_min)
  • Precipitation standard deviation(precip_sd)


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DQRID : D081022.5
Start DateStart TimeEnd DateEnd Time
11/01/1998000002/23/20090410
Subject:
TWP/SMET/C2 - Wind Speed data contain offset due to induced voltage
DataStreams:twpsmet60sC2.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:twpsmet60sC2.b1:
  • Upper sensor, wind speed vector average(up_spd_vec_avg)
  • Upper sensor, wind speed minimum(up_spd_min)
  • Lower sensor, wind speed minimum(lo_spd_min)
  • Upper sensor, wind speed maximum(up_spd_max)
  • Lower sensor, wind speed arithmetic average(lo_spd_arith_avg)
  • Lower sensor, wind speed maximum(lo_spd_max)
  • Lower sensor, wind speed vector average(lo_spd_vec_avg)
  • Lower sensor, wind speed standard deviation(lo_spd_sd)
  • Upper sensor, wind speed arithmetic average(up_spd_arith_avg)
  • Upper sensor, wind speed standard deviation(up_spd_sd)


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