Latest revision 27 October 1999

          Bad LAD 5 Data on TJD 11462

 TJD 11462 = 11 October 1999

During two intervals on TJD 11462, the count rates in both DISCLA and
CONTINUOUS data for LA Detector 5 became much too high at the lower
energies.  In both cases, the rates returned to normal by themselves
although the second return to normal occurred during a data gap.  The
high voltage was never off (due to SAA passage or by special command)
during the entire time.  The reason for the high rates is still unknown.

The spurious high count rates were strongest at the lower energies.
They appeared in all CONTINUOUS data channels, 0-15 (only 0 and 15
were investigated).
They appeared primarily in DISCLA data channels 1 and 2, with only
narrow spikes appearing in channel 3.  Channel 4 was not investigated
but probably did not show the spurious rates.

The incident followed similar occurrences on TJDs 11459 and 11460 and
preceded a similar occurrence on TJD 11465.

The approximate time ranges when the spuriously high rates occurred are
 71433 - 76195
 79480 - > 79857 (ended in data gap)

Quality Flags 75 (indicating high count rates in LAD 5) were set for
the following SoD intervals on TJD 11462:
 71430 - 76200
 79470 - 81000 (during the data gap)

No triggers occurred during the time intervals with the spurious rates.