DQRID : D931115.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
10/13/1993000010/31/19932359Suspect
10/01/1993000010/11/19932359Suspect
09/06/1993000009/08/19932359Suspect
09/10/1993000009/16/19932359Suspect
08/29/1993000008/29/19932359Suspect
09/18/1993000009/29/19932359Suspect
09/02/1993000009/03/19932359Suspect
11/01/1993000011/04/19932359Suspect
more
Subject:
SGP/EBBR/E4 - AEM malfunction
DataStreams:sgp30ebbrE4.b1, sgp15ebbrE4.b1, sgp5ebbrE4.b1
Description:
Beginning when the E4, Plevna EBBR was moved to a different location in the
same area on August 29, 1993, the home_15 signal began to malfunction
intermittently.  The home_15 signal is normally between 45 and 53; in the
case where it malfunctions, it reads approximately 22.  The home signal is
sampled only once per fifteen minute period to indicate the position of the
Automatic Exchange Mechanism (AEM).  However, the realtime value is used every
30 seconds to determine the sign of the gradient of temperature and relative
humidity.  Clearly, the 15 minute sample may not always reflect the proper
position if something is wrong with the AEM.  Therefore, when the home_15
signal is incorrect for a half hour, it is wise to view the preceding and
successive half hours of data with suspicion as well as the half hour of
interest.  Affected data are 5 minute values of mv_home; 15 values of
tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot,
and home; 30 minute values of tair_top, tair_bot, thum_top, thum_bot,
hum_top, hum_bot, vp_top, vp_bot, bowen, e, h, and home_15.  The dates on
which this problem occurred were (all 1993) August 29, September 2, 3, 6-8,
10-16, 18-29, October 1-11, 13-31, and November 1-4.

On November 4, 1993 the AEM was replaced at Plevna, correcting the problem
described in this PIF.
Suggestions: 
Measurements:sgp30ebbrE4.b1:
  • home_signal_15
  • home_signal_30
more
sgp5ebbrE4.b1:
  • home_signal
more
sgp15ebbrE4.b1:
  • home_signal
more

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