Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/14/2008 | 0457 | 12/30/2008 | 0040 |
Subject: | TWP/SKYRAD/C3 - Direct normal instrument failure |
DataStreams: | twpskyrad60sC3.b1, twpskyrad20sC3.a0 |
Description: | The NIP instrument (short_direct_normal data stream) failed giving bad data during this time period. The failure start time coincides with a reported DC power failure but no connection between the reported power failure and the failure of this instrument could be determined. Ops also reported the tracker clock running 2.9 minutes slow during maintenance on 12/22 0300GMT (see CS-2008-0714). Again, the slow clock is not suspect and did not appear to affect alignment. Ops replaced the NIP instrument on 12/30 and short_direct_normal data resumed normal operation. Disregard the short_direct_normal (NIP) data during this time period or calculate using the global and diffuse instruments and the following relationship: short_direct_normal = ((down_short_hemisp - down_short_diffuse_hemisp))/cos(zenith angle) |
Suggestions: | |
Measurements: | twpskyrad20sC3.a0: more
twpskyrad60sC3.b1: more |