Mauna Loa Solar Observatory Observer's Log 
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Wed Apr 26 16:58:23 GMT 1995
Year: 95  Doy: 116
Observer: yasukawa   console      Apr 26 16:42

WEATHER COMMENT: Wed Apr 26 16:58:50 GMT 1995
Cold, thin cirrus to east, sun just about clearing it, south wind
25-30 mph, temp=39F.


DPMON COMMENT: Wed Apr 26 17:00:20 GMT 1995
late startup, one of the fans in the Plessey was very noisy and
was stalling.  Removed covers and lubricated bearings to get it
running again.  quiet now.

Wed Apr 26 17:07:41 GMT 1995: Patrol Start

DPMON COMMENT: Wed Apr 26 17:15:49 GMT 1995
Daystar runaway.  Reset Plessey.


MKIII COMMENT: Wed Apr 26 17:24:36 GMT 1995
Coronal trace still noisy.  Will try swapping analog corrector
boards today, starting with chan 0 memory board.  Powering down
MKIII to do swap.


MKIII COMMENT: Wed Apr 26 17:31:29 GMT 1995
Swapped cards from chan 2 and chan 0.
Restarted to test.


MKIII COMMENT: Wed Apr 26 17:36:41 GMT 1995
Coronal scan is a lot quiter.  Will run in this configuration
for a while to determine if fix wasn't caused by cycling of
power rather than the swap.


MKIII COMMENT: Wed Apr 26 17:45:06 GMT 1995
When there's smoke, there's fire... just noticed that chan 1
is flat.  Looking into it.


MKIII COMMENT: Wed Apr 26 17:46:44 GMT 1995
Wow, it just came back up as I walked back over to the monitors.

Wed Apr 26 18:02:03 GMT 1995: Calibration

MKIII COMMENT: Wed Apr 26 18:04:44 GMT 1995
Stoope scan to check signals at DCSA.


COMMENT: Wed Apr 26 18:19:46 GMT 1995
Bumped spar while working on chan 1 problem.  repointed.


COMMENT: Wed Apr 26 18:53:06 GMT 1995
Sorry, still pushing on spar and upsetting guiding while troubleshooting
chan1.

Wed Apr 26 19:01:55 GMT 1995: Calibration
Wed Apr 26 20:02:00 GMT 1995: Calibration

MKIII COMMENT: Wed Apr 26 20:05:58 GMT 1995
Guiding was hosed while I did some channel swapping on mkiii.
opened top of dome in the meantime, also.


MKIII COMMENT: Wed Apr 26 20:47:46 GMT 1995
Tried a number of swaps and concluded that the Line driver on 
down are OK.  I managed to get the loaf back on chan 3 
by adjusting the balance and offset on chan 3 preamp.  Offset
was very unstable and loaf on monitor jumps around a lot.

Wed Apr 26 21:01:55 GMT 1995: Calibration

MKIII COMMENT: Wed Apr 26 21:04:47 GMT 1995
Offset is common mode so P-S is stable in Ch1.  Looked at PCOM
in relation to case and did not see any offsets.  


MKIII COMMENT: Wed Apr 26 21:34:19 GMT 1995
Swapped preamps 3 and 5, op chan 3 and 5 respectively, and after
adjusting the offset and balance, I got the same offset instability.


MKIII COMMENT: Wed Apr 26 21:46:19 GMT 1995
Tried swapping P detectors from op chan 3 with op chan 4.
Found a piece of aluminized tape or shim material in op chan 3
detector holder along 2/5 of ledge.  Not sure why it was there
and why it was not either all the way around, or applied equally
to either sides.  Removed it.

Wed Apr 26 22:02:02 GMT 1995: Calibration
Wed Apr 26 22:07:05 GMT 1995: Patrol End

MKIII COMMENT: Wed Apr 26 22:50:26 GMT 1995
Unstable offset cause was found to be poor connection at corcom
filter on the back of the wrap-up.  Removed connections and inspected
for broken wires and then reseated the connectors.  P+S trace as 
well as offset stable.  Swapped detectors back to original channels.
Preamps still swapped, will restore them next.  We may have to 
realign chan 1 as P+S and P-S profiles are now different.


MKIII COMMENT: Wed Apr 26 23:25:50 GMT 1995
Preamps swapped back to starting configuration,  OP chan3 has
preamp #3 installed.  Adjusted rotation of P detector until
P+S and P-S looked its best.  Restored all covers, screws, etc.
Will probably need to do a mask scan to document any change in
height, although S detector was not moved.  Also will probably need to
do a correct on channel 1.


MKIII COMMENT: Wed Apr 26 23:39:37 GMT 1995
running scans with mask and opal in place to document any height
changes that may have occurred by removing the channel 1 (OP3)
P detector.

Wed Apr 26 23:43:06 GMT 1995: Patrol Start

WEATHER COMMENT: Wed Apr 26 23:48:03 GMT 1995
Wind is buffeting the spar quite a bit.


MKIII COMMENT: Wed Apr 26 23:56:32 GMT 1995
Removed mask,  commencing correction to chan 1.

Thu Apr 27 00:01:57 GMT 1995: Calibration

MKIII COMMENT: Thu Apr 27 00:06:53 GMT 1995
CORRECT pau.

Thu Apr 27 00:28:05 GMT 1995: Patrol End
Thu Apr 27 00:28:28 GMT 1995: Filemark

COMMENT:  Wed April 26 00:34:26 GMT 1995
Activity Report:
QP:  50-55; 105; 223; 244; 252; 285-292; 300-308;
No coronal activity noticed.

TAPES:   MKIII:  H01017
	DPMON:   P00338
	LOWL:    L00226


SCAN-LOG 
SCAN-LOG  17:10:53.  4/26/95 DOY 116      
    17:18:45      17:21:58      17:25:15      17:31:41      17:34:56  
    17:38:14      17:41:31      17:44:52      17:48:08      17:51:24  
    17:54:38      17:57:54      23:26:04      23:29:17      23:40:36  
    23:43:49      23:47:01       0:08:08       0:11:20       0:14:31  
     0:17:43       0:20:53       0:24:06       0:27:18       0:30:33  
     0:33:44       0:36:56  
  0 ERRORS
OK