CACHE94: FASTT Messages: 9 Entries..

Fast T cal for t.10m.flux and t.15m.flux: 
 
  Since fun.plot.prep was not running 
at the time, the calibration was done the 
old fashion way with cshow. 
 
T.10m.flux: 
Gain factor = (50/32768) * (5/4.978) = .0015326224 
 
t.15m.flux: 
Gain factor = (50/32768) * (5/4.98375) = .0015308542 
 
 

fast T on walk calibration: 
 
 Fast T on the walkup tower was calibrated. 
The Splus functions were used to get the 
calibration coefficient. 
 
 
dT <- fun.fastT.cal.get("t.10m.walk","marigold", 
      100,214,1,49,"walk/fast214014637") 
 
cal factor = 0.001546464 
 
 

Fast T walkup down! 
 

fast T on walkup fixed: 
 
  Fast T on walkup was replaced and calibrated. 
Time: 17:33 GMT. 
 
dT <- fun.fastT.cal.get("t.10m.walk","marigold", 
100,221,17,33,"walk/fast221160000") 
 
dT 
 [1]  5.070909e+00  1.565865e+01  1.565920e+01 
 [4] -1.557380e+01 -5.081818e+00 -5.132727e+00 
 [7]  5.011818e+00 -5.090909e+00  5.013636e+00 
 [10] 1.531395e+01 -1.540190e+01 -1.540239e+01 
 [13] -7.418481e-04 
 
(50/32768) * 5/mean(abs(dT[5:9])) 
 
0.001505946 
 

t.10m.flux disconnected temporarily 
 
While playing with the sonic (see previous message), I disconnected 
the fast T.  After the sonic work, I replaced the probe and gave  
the bridge a cal. cycle with both switch positions for 5 seconds.   
 
Note that I may do this again if I decide to pull the array completely 
down. 
 

The heavy rains seem to have busted the 15 m platinum probe last
night after 09 GMT.

Replaced the fast T sensor on the flux tower
at 0133 GMT. I didn't hang around to adjust
the calibration since it began raining
heavily, although I did cycle the
gain calibration several times. This
data can be found in the period 
JD 253 01:33:30 to JD 253 01:36:30.

It turns out that the gain calibration is
as close as we could get it. Used fast 
data to check gain calibration,
which showed the 5 deg offset to be
within a few hundreths of a degree.

Note added later by Gordon Maclean Sept 23:  The data
indicates that the foam chamber was not installed
during this calibration.

Put zero wind tubes on the sonics and ran throught the calibration on
the fast T's at 10m and 15m.

10m sonic zeroes: 4:48-4:55 pm PDT
10m fast T cals:  4:59-5:01 pm PDT (using foam chamber)
  results: 9 gain switches,  mean difference: 5.0377, sd: .01108
	gain: 0.0015144

15m sonic zeroes: 5:36-5:41 pm PDT
15m fast T cals:  5:44-5:45 pm PDT (foam chamber)
  results: 11 gain switches: mean diff: 5.20956, sd: 0.01255
	gain: 0.0014655

A cal of the t.15m.flux was done on day 253 without the foam
chamber. See logbook entry 304.  We'll use this new cal
since the amplitude of the jumps is easier to determine.

Fast sensor was disconnected for ATI zero air chamber test.

Connected probe again and performed calibartion routine.
Toggle switch in different position, hold for ca. 5 secs.
1st: Null
than Operate, Cal, Operate, Cal, ....
Last: Null
than operate again.