To:sot_shift
from: Dan Schwartz
date: 12 Aug 99, 10:00pm EDT
Subject: SOT shift report, Shift H21
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Aug_12_1999_H21.txt.

Shift H21. (A21)
	Start at 224:02:00  GMT
		 = 10:00pm 11 Aug EDT
	End	   06:00am 12 Aug
   
SOT Lead	DAS
Spac/Aspect	RAC
FOT/Sci liason	EM
HRC		GA 
ACIS 		YB

(Times will be given in GMT on day 224. In general
times are rough, not precise.)

PLAN
Continue ACA dark current calibration. Dark current at -10 degC,
  power cycle PEA and repeat dark current.
Continue ACIS FCM measurement. Finish -I & switch to -S.

EVENTS
Running FCM measurement with OBSID 62743
SSR dump complete ~02:00.
Start ACA "cold" dark current cal at 02:24.
04:45 finish second series of ACA dark current run.
Re-acquire fid lights, 04:49.

05:06 end ACIS FCM run. 
Change OBSID to 62742 to continue FCM with ACIS-S, 05:11.
05:13  start next ACIS science run.

~05:40, start 3rd run of ACA dark current cal. Need to restart
07:15. 


NOTES/ISSUES/PROBLEMS
Lost 42 rows of ACA data from the warm dark current cal.

Vacuum monitor is reading about 7.6 10^-6 torr -- not quite as
  low as before the SSD opening.

Prior to the 3rd run of ACA dark current calibrations, 
  we did a PEA reset.  But we neglected to uplink the 
  command load to reset the correct contents for the 
  6 bytes which fill in the minor frame header.  We commanded 
  a software reset to fix this -- but by this time the ACA
  warmed up and we needed extra time to cool back to -10 degC.
  We obtained an extention of Goldstone contact time to allow
  completion of the ACA dark current cal. (keep Goldstone 
  until 12:37)

Tom A checked for interference between fid lights and stars in the
  initial nudge modes, and confirmed that there is NO interference.

Skip ACA dark current load #3, do 1, 2, 4.

-------------------------------------------------------
Dan Schwartz,	MS #3
das@head-cfa.harvard.edu  
phone: (617)495-7232    FAX:   (617)495-7356
cell phone: (617)512-5627   
pager: 800-759-8352 PIN 1636502
       or e-mail 1636502@skytel.com 
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