Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
10/13/1993 | 0000 | 10/31/1993 | 2359 | Suspect |
10/01/1993 | 0000 | 10/11/1993 | 2359 | Suspect |
09/06/1993 | 0000 | 09/08/1993 | 2359 | Suspect |
09/10/1993 | 0000 | 09/16/1993 | 2359 | Suspect |
08/29/1993 | 0000 | 08/29/1993 | 2359 | Suspect |
09/18/1993 | 0000 | 09/29/1993 | 2359 | Suspect |
09/02/1993 | 0000 | 09/03/1993 | 2359 | Suspect |
11/01/1993 | 0000 | 11/04/1993 | 2359 | Suspect |
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: more
sgp5ebbrE4.b1: more sgp15ebbrE4.b1: more |