MTA Monitoring Report 10/20/00 - 10/27/00

Archive of all weekly reports

Archive of Monthly reports

Radiation

Rates rising at week's end due to Full Halo CME on 2000/10/25
No Violations

CTI trend

Average of ACIS-I CCDs (MnKa) slope 2.305e-8 CTI/day
Detrended slope 1.456e-8 CTI/day

ACIS Focal Temperature

For this period, there were 3 peaks. 
       Day (DOY)       Temp (C)        Width (DAY)

        294.7           -116.1          0.28
        297.3           -116.5          0.33
        299.9           -117.6          0.28

        Small, brief spike to -119.0 at Day 300.9
         due to ACIS warm reboot after DPA anomaly (see Notes)

MTA Problem Tracking

No new or reopened problems were reported in this period.
The following MSIDS are still coming:
CIUB5V CIUB15V C28VMONB AIOBP5CV CUSOB28V
AWD1TQI AWD2TQI AWD3TQI AWD4TQI AWD5TQI AWD6TQI

SIM Movement

8 TSC moves this period
weekly average time/step 0.00134 s
mission average time/step 0.00139 s

Telemetry

10/23-24 TSCIUSF1 S/C Temp SC-IUS FITTING-1 TEMP reaches upper yellow limit 349.7
10/26 DPA A off - See Notes below - Lost obsids 979 980


Trending

This Week's focus Ephin

Recent Observations

The ACA Problem is in the specified handling of guide star positional errors. This issue in not signifcant to the final product and so is being worked at low priority.
OBSID DETECTOR GRATING TARGET ANALYSIS ACA
1032 ACIS-I NONE RX J0852.0-4622 OK OK
434 ACIS-S NONE 3C 212 Aspect prob? OK
1636 ACIS-S NONE NGC 2683 OK OK
1596 ACIS-S NONE 0902+343 OK OK
1635 ACIS-S NONE NGC 2541 OK Missing
976 HRC-S LETG KPD0005+5106 OK OK
1591 HRC-S LETG NGC 3227 OK OK
975 HRC-S LETG AD LEO OK OK
755 ACIS NONE B2224+65 OK OK
2161 ACIS-I NONE 2MASSJ102724+1219 OK OK
2200 ACIS NONE R1361 OK PROBLEM
1659 ACIS-I NONE ZWCL 1953 OK OK
552 ACIS-I NONE RX J2129.6+0005 OK OK
314 ACIS NONE M31 TRANSIENT OK OK
894 ACIS-I NONE ABELL 2255 OK OK
2146 ACIS-S NONE 2251+134 OK OK
1031 ACIS-S NONE Mrk 231 OK OK
2199 ACIS-S NONE RXJ0819.6+6336 OK OK
2202 ACIS-I NONE RBS797 OK PROBLEM
1872 ACIS-S NONE NGC 2068 OK OK

Notes

ACIS Anomaly


From: Roger Brissenden 

During last week the observing schedule was completed as planned with
the exception of approximately 6 hours of ACIS observing that was
impacted when the ACIS Digital Processing Assembly (DPA-A) powered off
at 11:42 am EDT on 26 Sept. The turn-off was detected during a
real-time pass and following engineering assessment, the DPA was
powered on and ACIS returned to science operation. ACIS has operated
nominally since then and the cause of the turn-off is being
investigated by the ACIS engineering team.  Observations of HD100546,
HD104237 and a portion of Sgr A were impacted and will be rescheduled.


From: Paul Plucinsky 

  For DPA A we need to watch:
1DP28AVO - input voltage which is currently 29.92 V,normal
1DPICACU - DPA Input Current which is currently ZERO, definitely not normal
1DPP0AVO - DPA +5V Analog which is currently 0.02 V which is consistent
           with being off, not normal
1DPPSAX  - DPA A Enabled/Disabled, currently enabled, normal
1DPPSA   - DPA A On/Off, currently OFF !!!

DPA B looks OK to me:
1DP28BVO - input voltage which is currently 30.08 V,normal
1DPIBCU - the input current on side B of the DPA currently 0.27 A,
          which is consistent with the FEPs on side B begin off.
          We always keep the FEPs on in the load.  So, I am not sure
          why the FEPs on side B are off.  Perhaps Bob can explain
          why cutting the power on side DPA A would cause the B side
          FEPs to turn off.  But 0.3 A and 8.0 W is a reasonable value
          for he side B power consumption.
1DPP0BVO - DPA +5V Analog Side B which is currently 5.13 V which is
consistent
          with DPA B being on.
1DPPSBX  - DPA B Enabled/Disabled, currently enabled, normal
1DPPSB   - DPA B On/Off, currently ON, normal


SO, DPA A is enabled but off, DPA B looks fine.  The DPA A Over-current
indicator 1DPCPAOC indicates that we did not have an overcurrent situation.