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		Mauna Loa Solar Observatory Observer's Log 
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	Sun Sep 12 16:39:44 GMT 1999
Year: 99  Doy: 255
Observer: koon
Sun Sep 12 16:40:15 GMT 1999	CHIP	 Startup--Initializing new tape
Sun Sep 12 16:43:29 GMT 1999    MKIV    Start Patrol
WEATHER COMMENT: Sun Sep 12 16:43:32 GMT 1999
Clear sky, hazy below, wind=5 mph from the SW, temp=48 F.
 16:43:43 GMT 1999	CHIP	 CHIP Start Patrol
Sun Sep 12 17:01:52 GMT 1999	CHIP	 Bias
Sun Sep 12 17:02:53 GMT 1999	CHIP	 End Bias
Sun Sep 12 17:03:03 GMT 1999	CHIP	 Water
Sun Sep 12 17:03:43 GMT 1999	CHIP	 End Water
Sun Sep 12 18:01:50 GMT 1999	CHIP	 Bias
Sun Sep 12 18:02:30 GMT 1999	PICS	 Flat
Sun Sep 12 18:02:43 GMT 1999	CHIP	 End Bias
Sun Sep 12 18:02:53 GMT 1999	CHIP	 Water
Sun Sep 12 18:03:37 GMT 1999	CHIP	 End Water
Sun Sep 12 18:05:03 GMT 1999	PICS	 End Flat
Sun Sep 12 18:14:10 GMT 1999    MKIV    Start Cal
Sun Sep 12 18:35:58 GMT 1999    MKIV    Start Patrol
Sun Sep 12 19:00:28 GMT 1999	PICS	 polarization_calibration
Sun Sep 12 19:00:55 GMT 1999	CHIP	 Bias
Sun Sep 12 19:01:53 GMT 1999	CHIP	 End Bias
Sun Sep 12 19:02:12 GMT 1999	CHIP	 Water
Sun Sep 12 19:02:52 GMT 1999	CHIP	 End Water
**MKIV PROBLEM**: Sun Sep 12 19:20:44 GMT 1999
The screen readout of Sky Trx. is varying between about 280 and about 345 
again, like last Thursday.  It has been doing this every time I looked at
it today.  It is a very regular pattern something like:
346.00, 346.00, 345.00, 280.00, over and over again, each read takes
1 second, so the whole repeating sequence takes 4 seconds.  Every four
seconds there is un unreasonably low reading around 280.00
Sun Sep 12 20:00:47 GMT 1999	CHIP	 Gain
Sun Sep 12 20:05:23 GMT 1999	CHIP	 End Gain
Sun Sep 12 20:05:33 GMT 1999	CHIP	 Bias
Sun Sep 12 20:06:22 GMT 1999	CHIP	 End Bias
Sun Sep 12 20:06:36 GMT 1999	CHIP	 Water
Sun Sep 12 20:07:15 GMT 1999	CHIP	 End Water
COMMENT: Sun Sep 12 20:43:50 GMT 1999
Extended the dome slot.
Sun Sep 12 21:01:50 GMT 1999	CHIP	 Bias
**MKIV PROBLEM**: Sun Sep 12 21:02:36 GMT 1999
I'm adjusting the Sky Trx telescope gain.  Three revs out on screw gives
screen readouts bouncing between 1023 and about 540, with 540 being
display every 4 seconds and 1023 the rest of the time.  I'm hoping that
I can reduce or eliminate the strange rampdown that appears in the
signal voltage at a 60 Hz frequency by adjusting the signal gain.
60 Hz noise could be induced on the signal lines from almost any of
the AC equipment we use since normal utility power is 60 Hz. 
**MKIV PROBLEM**: Sun Sep 12 21:05:41 GMT 1999
Now I'm at 2 revs CCW from start point and the range is 513 to 1023.
**MKIV PROBLEM**: Sun Sep 12 21:08:12 GMT 1999
Now at 1.5 rev CCW from startpoint and range is 463 to 838.
**MKIV PROBLEM**: Sun Sep 12 21:15:00 GMT 1999
Now at 0.5 rev CCW from start and range is 333 to 434.
**MKIV PROBLEM**: Sun Sep 12 21:17:08 GMT 1999
Now back at start point and range is back to 284 to 346.
**MKIV PROBLEM**: Sun Sep 12 21:22:46 GMT 1999
I tried up to 2 revs CW from starting point without any change in the
readout or Sky Trx voltage ranges.  No hard stop, but no adjustment
change either.
**MKIV PROBLEM**: Sun Sep 12 21:53:34 GMT 1999
I put the gain pot back to the starting point.  David called and I told
him that the pattern Eric saw was related to 60 Hz noise probably,
it has a period of about 17 msec.  Also, earlier today, after I noticed
that, I checked the noise when the dome was closed, it had a peak-peak
amplitude of about 250 mV and looked more like 60 Hz noise induced
on cables from normal 60 Hz power lines, when the dome was opened the
bottom peak of the noise dropped way down, causing the ramp down that
Eric found.  It's like the 60 Hz noise is causing something to go
below a threshold and then the Sky Trx signal plummets until the 
noise peaks again.  That's why I tried changing the gain, I thought
an increase or decrease might help avoid a cutoff threshold, I was
only able to adjust the signal upward and there was still a 60 Hz
ramp down in the signal.  This should be a flat analog DC signal
but it is pulsed due to the rampdown that appears to be caused by
some 60 Hz signal.  I mentioned that the voltage reading is steady
and asked if that was given at a high enough time resolution to be
used for the pB correction.  They only use one read per scan (I think)
and a possible maximum of only 2 Hz, so this averaged voltage reading
can be used for now to give a much more precise correction.
**MKIV PROBLEM**: Sun Sep 12 22:12:05 GMT 1999
At David's request I have put a .3 ND filter over the Sky Trx. telescope
to see if the signal goes down linearly.  It should be in the 140 to 175
range but it is showing about 139 to 141, no big variations, no 4 second
period.  The o-scope shows very little or no ramp-down and the Sky
Trx voltage shown on the screen is about 1.36 volts, and the Datel
readout is about 560 (it was about 1380 before).  So the signal doesn't 
vary linearly with light input. Regarding the decrease in the 60 Hz
rampdown problem, this is what I was trying to do with the
gain but it was already as low as possible, so decreasing the signal
does cutout the rampdown problem.
WEATHER COMMENT: Sun Sep 12 22:25:48 GMT 1999
Unfortunately orographic clouds moved in shortly after I put the ND filter
in place.  But they come and go.
**PICS PROBLEM**: Sun Sep 12 22:33:46 GMT 1999
The dome was blocking the sun earlier for this instrument, I moved it
just before the clouds started coming in.  Not sure how long, preoccupied
with MkIV tests.
52 GMT 1999	CHIP	 CHIP End Patrol
WEATHER COMMENT: Sun Sep 12 22:35:09 GMT 1999
Clouds are very thick and staying overhead, closing down.
MKIV COMMENT: Sun Sep 12 22:35:37 GMT 1999
Removed the 0.3 ND, will try to get another scan before shutting down,
but clouds are lurking around.  
	 ending tape
**MKIV PROBLEM**: Sun Sep 12 22:38:20 GMT 1999
So the more the Sky Trx telescope signal is increased, the more the 60 Hz
rampdown seems to affect the signal, but why?  For now David is going
to use an averaged voltage reading as the basis for the pB correction.
**PSPT PROBLEM**: Sun Sep 12 22:56:47 GMT 1999
Clouds prevented regular shutdown, I tried "Obs" and it did go a little
further by giving the menu but when I selected "exit" it still tried to
startup in the clouds.  I used "pspt_shutdown" from the IDL prompt to
shutdown, that works but doesn't transfer data.
Sun Sep 12 23:08:28 GMT 1999    MKIV    End Patrol
COMMENT: Sun Sep 12 23:20:59 GMT 1999

TAPES:
******
MKIV: 99255
CHIP: C00919
PICS: P01543
LOWL: L00627 in drive #0

Sun Sep 12 23:21:52 GMT 1999 
	MkIII	
 
16_43.rawmk3   18_00.rawmk3   19_28.rawmk3   20_45.rawmk3   22_02.rawmk3
16_46.rawmk3   18_03.rawmk3   19_31.rawmk3   20_48.rawmk3   22_05.rawmk3
16_50.rawmk3   18_07.rawmk3   19_35.rawmk3   20_52.rawmk3   22_09.rawmk3
16_53.rawmk3   18_10.rawmk3   19_38.rawmk3   20_55.rawmk3   22_12.rawmk3
16_57.rawmk3   18_17.rawmk3   19_42.rawmk3   20_59.rawmk3   22_16.rawmk3
17_00.rawmk3   18_25.rawmk3   19_45.rawmk3   21_03.rawmk3   22_19.rawmk3
17_04.rawmk3   18_32.rawmk3   19_49.rawmk3   21_06.rawmk3   22_23.rawmk3
17_07.rawmk3   18_36.rawmk3   19_52.rawmk3   21_09.rawmk3   22_26.rawmk3
17_11.rawmk3   18_39.rawmk3   19_56.rawmk3   21_13.rawmk3   22_30.rawmk3
17_14.rawmk3   18_43.rawmk3   19_59.rawmk3   21_16.rawmk3   22_33.rawmk3
17_18.rawmk3   18_46.rawmk3   20_03.rawmk3   21_20.rawmk3   22_37.rawmk3
17_21.rawmk3   18_50.rawmk3   20_07.rawmk3   21_23.rawmk3   22_40.rawmk3
17_25.rawmk3   18_53.rawmk3   20_10.rawmk3   21_27.rawmk3   22_44.rawmk3
17_28.rawmk3   18_57.rawmk3   20_14.rawmk3   21_30.rawmk3   22_47.rawmk3
17_32.rawmk3   19_00.rawmk3   20_17.rawmk3   21_34.rawmk3   22_51.rawmk3
17_35.rawmk3   19_03.rawmk3   20_21.rawmk3   21_37.rawmk3   22_54.rawmk3
17_39.rawmk3   19_07.rawmk3   20_24.rawmk3   21_41.rawmk3   22_58.rawmk3
17_42.rawmk3   19_10.rawmk3   20_27.rawmk3   21_44.rawmk3   23_01.rawmk3
17_46.rawmk3   19_14.rawmk3   20_31.rawmk3   21_48.rawmk3   23_05.rawmk3
17_49.rawmk3   19_17.rawmk3   20_34.rawmk3   21_51.rawmk3   c18_14.rawmk3
17_53.rawmk3   19_21.rawmk3   20_38.rawmk3   21_55.rawmk3   c18_21.rawmk3
17_56.rawmk3   19_24.rawmk3   20_41.rawmk3   21_58.rawmk3   c18_28.rawmk3