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CERES +15V Power Converter Anomaly


Anomaly Summary

The CERES Proto-Flight Model (PFM) instrument aboard the Tropical Rainfall Measuring Mission (TRMM) exceeded a yellow high limit for the Data Acquisition Assembly (DAA) +15 volt measurement on August 18, 1998. Upon review of instrument data it was noted the +15 volt level began increasing on July 31, 1998. The trend for the maximum voltage seen during a 24 hour period has been gradually upward since July 31st with an amplitude peak reaching approximately 16.9 volts on September 1, 1998. Due to overvoltage concerns for electronic parts downstream of the converter, the CERES instrument's operational power has been removed.

LaRC, TRW, and the TRMM Flight Operations Team continue to examine the CERES instrument and spacecraft data for an explanation and resolution to the anomaly.


Status Reports


Graphs


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  Image: NASA Logo NASA Official: Dr. Norman Loeb
Page Curator: Edward Kizer
Page Last Modified: 10/16/2017 11:05:19 EST
Site Last Modified: 11/07/2017 17:18:43 EST