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May 2006 CDS Report (Error Messages & Efficiency)

Filter Usage

  Time (s) Cathode Time (%) Cathode
Num Description Pos Used Down Up Down Up
0 Blocked 2200 0 0.0 0.0 0.00 0.00
0 Blocked 0000 381 501128.2 29933.3 18.71 1.12
1 UV Grism Clocked 0160 32 3712.2 14399.1 0.14 0.54
1 UV Grism 0200 0 0.0 0.0 0.00 0.00
2 UVW2 0400 1701 41525.9 526197.3 1.55 19.65
3 V 0600 918 19006.8 157194.2 0.71 5.87
4 UVM2 0800 1578 140050.2 456399.6 5.23 17.04
5 Vis Grism Clocked 0955 28 1692.0 10231.7 0.06 0.38
5 Vis Grism 1000 0 0.0 0.0 0.00 0.00
6 UVW1 1200 1836 85470.9 352331.3 3.19 13.16
7 U 1400 1713 11755.2 179734.7 0.44 6.71
8 Mag 1600 0 0.0 0.0 0.00 0.00
9 B 1800 820 3296.3 75985.4 0.12 2.84
10 White 2000 91 5316.3 62731.8 0.20 2.34
  Totals   9098 812954.0 1865138.4 30.36 69.64

Observing Efficiency

Description Time (s) % Time
UNKNOWN 14441.41 0.54
BASIC 0.00 0.00
SAFE 222.60 0.01
SLEW 318778.59 11.90
SETTLING 118.97 0.00
FINDING 1254.24 0.05
AUTOMATED 176584.87 6.59
PLANNED UNBLOCKED 1664463.59 62.15
PLANNED BLOCKED CATHODE DOWN 101436.88 3.79
PLANNED BLOCKED CATHODE UP 0.00 0.00
SAFEPOINT 29838.69 1.11
SAA UNBLOCKED NON AT 22990.59 0.86
SAA UNBLOCKED AT 14039.50 0.52
SAA BLOCKED 307969.04 11.50
IDLE 25416.78 0.95
UNPLANNED IDLE 668.60 0.02
     
TOTAL 2678224.35 100.0

Comments on Errors

Note: a summary of the NHK messages encountered this month, listed in increasing frequency of occurrence, may be found at http://msslje.mssl.ucl.ac.uk/lists/nhklis_2006-05.txt

DPU INF TMALI full Messages

During this period, there were observed high count rate's in the UV and Visible grisms observations of Comet 73P/3-C

Busy

This (at 2006-05-26 09:13:16.58) is a repeat of an earlier anomoly (HV task can appear busy when it is finished SERS S-0202).

DCS Insufficient Priority

(2006-05-06 14:44:51.79) Mark Hilliard manually put UVOT into safe because the star tracker had lost lock and was struggling to recover. This expected message was generated whilst the automatic systems were trying to run a diffreential drift recovery whilst the UVOT was moving to safe.

A cold reboot of the star tracker was performed at 17:02 UT and the spacecraft was transitioned to inertial point mode at 18:19 UT.

By 19:15 UT, UVOT had been brought back to idle, and BAT triggers and ATs re-enabled. PTs were left disabled, whilst the performance of the star-tracker observing safe points was monitored for the following 24 hours.

An anomaly report was raised for the Star Tracker problem (S-0397).

No Usable Filters in Config

This expected message (at 2006-05-26 16:59:42.61) was caused by an RTS abort request coming in just as the catalog was being searched. As a failsafe, the code returns a zero length exposure time for all possible filters, which leads to this message

BATGRBFLUXINFO Proc Stat

A timeout occurred on an expected BATGRBFLUXINFO record. This message at 2006-05-01 09:08:33.17 was an artifact caused by on-board testing.

DPU Unexpected ACK/NAK

At 2006-05-19 08:42:02.68 a DPU NAK was encountered. The ICU successfuly resent the command. No ground intervention was required.

Limit Exceeded (Alert Flag Safety Circuit)

There were 2 occurrences of the safety circuit triggering on first poll but not the second at 2006-05-07 17:31:32.13 and 2006-05-08 15:14:29.95. Consequently, the ICU did not transition to safe.

Small Differential Drift

There were 4 occurrences of Small Differential Drift (with associated Running Recovery RTS messages) at the following times
Time Drift (arc min)
2006-05-05 18:23:59.78 6
2006-05-06 14:44:51.79 6
2006-05-11 15:16:39.78 3
2006-05-21 11:34:41.88 3

Count Rate Too High

3 occurrences of this message occurred due to the presence in the field of view of catalogued bright stars whilst observing the comet 73P/3-C.
Time
2006-05-07 22:54:08.66
2006-05-08 00:30:10.85
2006-05-19 11:45:24.66


Last revision: r5 - 2006-09-13 - 11:22:23 - HowardHuckle
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