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Apr 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 413 539249.8 41171.0 20.81 1.59
1 UV Grism Clocked 0160 181 33665.9 134748.5 1.30 5.20
1 UV Grism 0200 5 105.0 6205.7 0.00 0.24
2 UVW2 0400 1275 24282.3 411977.0 0.94 15.89
3 V 0600 1096 31109.6 264676.9 1.20 10.21
4 UVM2 0800 1091 65517.8 338920.3 2.53 13.08
5 Vis Grism Clocked 0955 89 1088.1 46480.5 0.04 1.79
5 Vis Grism 1000 0 0.0 0.0 0.00 0.00
6 UVW1 1200 1347 118182.5 260720.9 4.56 10.06
7 U 1400 1312 4220.2 139488.0 0.16 5.38
8 Mag 1600 0 0.0 0.0 0.00 0.00
9 B 1800 957 3332.1 118013.8 0.13 4.55
10 White 2000 34 208.3 8532.3 0.01 0.33
  Totals   7800 820961.5 1770934.9 31.67 68.33

Observing Efficiency

Description Time (s) % Time
UNKNOWN 11.32 0.00
BASIC 0.00 0.00
SAFE 32156.37 1.24
SLEW 302559.47 11.67
SETTLING 99.57 0.00
FINDING 574.62 0.02
AUTOMATED 119749.18 4.62
PLANNED UNBLOCKED 1615237.90 62.32
PLANNED BLOCKED CATHODE DOWN 119540.98 4.61
PLANNED BLOCKED CATHODE UP 41092.84 1.59
SAFEPOINT 0.00 0.00
SAA UNBLOCKED NON AT 27697.26 1.07
SAA UNBLOCKED AT 370.58 0.01
SAA BLOCKED 311201.97 12.01
IDLE 21050.58 0.81
UNPLANNED IDLE 565.18 0.02
     
TOTAL 2591907.82 100.0

Comments on Tables

There is a significant reduction in the use of blocked filter with cathode down (from ~ 30% to ~ 20%) due to greater use of the filters for 'boring' exposures.

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_2006-04.txt

Slew Aborts

S-0210: At 117/15:25:04z, a FOM Slew Abort message was received and at approximately the same time the TC from UVOT ICU Reject Counter (SBCRJCTTC_ICU) incremented. This is appears to be a recurrence of S-0074 and is under a watch.

Large Settled Position Error

UVOT went to safe at 2006-098-05:26:56 UT. This was following a "star tracker is not OK" alert. UVOT reported a "large settled position error" (of the order of 1 degree).

DCS State Table Match Fail

The message was received at 2006-04-25 17:44:00.86. This would appear to be evidence of some race condition (as yet unknown). The MSSL NCR 157 was opened to investigate this.

TMALI Full

These occurred during grism observation of RS Orph.


Last revision: r5 - 2006-09-13 - 13:24:17 - HowardHuckle
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Topic revision: r5 - 2006-09-13 - HowardHuckle
 
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