SHEBA: Hygrothermometer Messages: 16 Entries..

  There are spikes on the TRH data. This occurs about
every 2 hours. It affects all data from the TRH.
At this point I have no idea why. So I decided to change the
data rate from the TRH to EVE, on station 1, to 2 seconds instead
of 1 second. After some time will check to see if we have any improvement.

  There are no spikes in TRH from ststaion 4 since we
downloaded the new config. New configs will be downloaded
at all other sites as soon as possible.

  The TRH was down at station 3 because we were not able to
reprogram it. The Rocky screen was useless. With the TEG running
the box should be warm enough by tomorrow for the Rocky.

UPDATE: Gordon was able to send fast commands over the freewave
link to Baltimore, station 3. This allowed us to reprogram the
TRH. It is now running.

  At times the thermistor and platinum temperatures stray
from each other. When the iceing around the shield is cleaned
off the temps agree much better. The icing maybe the
reason. An example is day 26th at 10 to 11 am local at station
3. You can see an effect due to shield cleaning.

  I started adding the set screws to the shield mount attaching
to the electronics housing on the TRH sensors. The spare sensor
was sent out to station 4 and station 4 sensor was sent to
station 2. Hopefully stations 1 and 3 will get done in the next
few days.

The compass at station 4 (florida) is reading -19.9, instead of the usual
221:



TRH007 -12.89 84.59 -13.06 -19.99 0 1
TRH007 -12.89 84.57 -13.06 -19.99 0 1
TRH007 -12.90 84.54 -13.06 -19.99 0 1
TRH007 -12.89 84.58 -13.06 -19.98 0 1


Eve does a (-1,360) limit check on this and so converts it to NA.

The NA's in the data started at 97 10 28 094730.000 AKST.  Perhaps
this is when Steve put in the new TRH.

UPDATE:  The problem was the settings for compoff in EE prom. The
value has to be at least 4 (I do not want to explain why at this time!).
The compass settings have been changed. Refer to entry 101 for more
information.

  Jeff and I wen to Atlanta to change the TRH so that set
screws can be put into the coupler between the shield and
the electronics housing. All sensors were cleaned off.
  Temperature and RH look fine. The compass heading has shifted
about 3 degrees to the North. This could be due to the
necessity of pulling the compass off one unit then mounting
it on the other.

  Gordon and I went to Baltimore to replace the TRH and
play with the TEG. Since the pressure setting on the TEG
to spec we did not try to re-adjust it. We did turn off the
automatic sparker by moving the palte which holds the switch
in.

  The comapss on/off settings in all TRH are now set
the same. The on time is 10 minutes and the off is 4 seconds.
WARNING:  The off time should not be set lower than this.

1/5 19:00gmt
	Replaced fan in TRH at Florida.  (This is originally Baltimore's TRH, 
and was installed at Florida for testing.)

  The humidity at station 4 deviated from the other stations last night.
It did not agree with the met tower sensors either.
This was about 6 hours after the heater system was added. The sensor was
brought back to the ship for a looksee. Its response looked ok when
compared to the spare sensor. The TRH was put back out at 4, time was ~11:45
local.

  At ~18:00 local, station 4 RH came back into sync with the other
stations.

UPDATE: The RH continues to look good. There was a little bit of
activity from 4:00 to 6:00 am, local.

John and I began the hygrothermometer intercomparison today.  I 
mounted the four hygrothermometers on the rad beam about a meter
from the mast and pointing in the direction of the TRH boom.  We
took the Atlanta sled to Florida and then brought out the electronics
boxes from Maui and Baltimore.  We connected the hygrothermometers
in the order that they were on the first week of August:

Atlanta (stn 1)		TRH#3
Maui (stn 2)		TRH#6
Baltimore (stn 3)	TRH#5
Florida (stn 4)		TRH#7

I hoped to also include the spare hygrothermometer in this 
intercomparison, but it would require a new configuration on one of
the EVE boxes to ingest a second set of TRH data.

At first, I connected TRH#3 to Atlanta, but I corrected this after
lunch, perhaps by 1400.  We also are not receiving the TRH data from
Maui.  John suspects a loose connector at EVE.
	98/10/01 19:40 AKDT Maui repaired and working.
	Problem was in the electronics box, see specific log entry

Record of station hygrothermometer usage:

Station 1
Start			1/15/98	1040 AKST	#0004
1/15/98	1055 AKST	2/2/98	1200 AKST	#0006
2/9/98	1540 AKST	End			#0003
 
Station 2
Start			?			#0006?
12/27/97 1130 AKST	2/5/98	2030 AKST	#0005
4/6/98	1440 AKDT	End			#0006

Station 3
Start			12/24/97 1130 AKST	#0003
12/24/97 1130 AKST	1/13/98	1120 AKST	#0006
1/13/98	1140 AKST	3/30/98	1545 AKST	#0007
3/30/98 1610 AKST	5/25/98	1415 AKDT	#0001
5/25/98	1420 AKDT	End			#0005

Station 4
Start			12/31/97 1400 AKST	#0007
12/31/97 1440 AKST	1/7/98	2100 AKST	#0003
1/7/98	2110 AKST	1/13/98	0915 AKST	#0007
1/13/98	1820 AKST	1/15/98	0930 AKST	#0006
1/20/98	1545 AKST	2/2/98	0940 AKST	#0003
2/3/98	1320 AKST	2/25/98	1615 AKST	#0006
2/25/98	1620 AKST	5/11/98	1440 AKDT	#0005
5/11/98	1500 AKDT	End			#0007

Arranged by hygrothermometer:

#0001
3/30/98 1610 AKST	5/25/98	1415 AKDT	Stn 3

#0003
Start			12/24/97 1130 AKST	Stn 3
12/31/97 1440 AKST	1/7/98	2100 AKST	Stn 4
1/20/98	1545 AKST	2/2/98	0940 AKST	Stn 4
2/9/98	1540 AKST	End			Stn 1

#0004
Start			1/15/98	1040 AKST	Stn 1

#0005
12/27/97 1130 AKST	2/5/98	2030 AKST	Stn 2
2/25/98	1620 AKST	5/11/98	1440 AKDT	Stn 4
5/25/98	1420 AKDT	End			Stn 3

#0006
12/24/97 1130 AKST	1/13/98	1120 AKST	Stn 3
1/13/98	1820 AKST	1/15/98	0930 AKST	Stn 4
1/15/98	1055 AKST	2/2/98	1200 AKST	Stn 1
2/3/98	1320 AKST	2/25/98	1615 AKST	Stn 4
4/6/98	1440 AKDT	End			Stn 2

#0007
Start			12/31/97 1400 AKST	Stn 4
1/7/98	2110 AKST	1/13/98	0915 AKST	Stn 4
1/13/98	1140 AKST	3/30/98	1545 AKST	Stn 3
5/11/98	1500 AKDT	End			Stn 4

At 1310 AKDT, October 3, we swapped in hygrothermometer #0001
(case is labeled #0004) in place of #0003 (Station 1).

Following is a tabulation of the measured heights of the
hygrothermometer inlet.  In a few cases, the height of the
hygrothermometer boom was measured and I subtracted 42-43 cm
to get the height of the intake.

The existing measurements could be supplemented with the more
frequent measurements of the height of the sonic boom.  The 
hygrothermometer inlet appears to be nominally 1 m below the
sonic boom.  The variability in this difference is likely due
to the variability in the height of the surface below the two
booms.

Station 1	TRH intake	Sonic boom

10/15/97			2.88m
4/11/98				2.26m
4/17/98				2.26m
5/21/98		1.27m		2.22m
6/12/98		1.43m		2.39m
6/22/98		1.61m		2.51m
7/6/98				2.77m
7/21/98				2.87m
8/3/98				2.92m
8/29/98		1.87m		2.97m
9/16/98		1.84m		2.90m
9/30/98		1.69m		2.73m

Station 2

10/15/97			2.88m
4/11/98				2.82m
4/16/98				2.87m
5/16/98		1.81m		2.87m
6/12/98		2.04m		3.02m
6/23/98		1.92m		3.03m
7/7/98				3.12m
7/23/98				3.24m
7/30/98				3.23m
8/26/98		2.18m		3.28m
9/16/98		2.30m		3.26m


Station 3

10/15/97			2.87m
4/22/98				2.46m
5/15/98		1.43m		2.34m
6/18/98		1.71m		2.63m
6/29/98		1.80m		2.68m
7/9/98				2.69m
7/30/98				2.97m
8/10/98				2.97m
8/24/98		1.94m		2.93m
9/20/98		1.90m		2.92m

Station 4

10/23/97	1.73m		2.90m
4/11/98				2.75m
4/20/98				2.62m
5/16/98		1.88m		2.84m
6/8/98		1.87m		2.89m
6/13/98		1.86m		2.90m
7/29/98				2.93m
8/26/98		1.87m		2.95m
9/8/98		1.87m		2.93m
9/20/98		1.96m		2.92m
9/30/98		1.82m		2.94m


Assumed that center of Gill array is 58cm above center of boom.
Logbook 659 states that the TRH intake was 43cm below the center
of the TRH boom.
Logbook 675 states that the TRH intake was 42cm below the center
of the TRH boom.