- 86: FASTT , Site none, Wed 12-Feb-1992 15:14:05 GMT, FAST T 4M
FAST T 4M
The 4m fast t went out last night
around blank am. Changed the sensor this
morning around 15Z.Seems to be working again.
- 94: FASTT , Site none, Thu 13-Feb-1992 22:56:01 GMT, REPLACED BROKEN FAST T AT 10m
REPLACED BROKEN FAST T AT 10m
We replaced a broken fast T at 10m, but
did not calibrate it.
- 103: FASTT , Site none, Tue 18-Feb-1992 21:06:24 GMT, Replaced fast temperature sensor at 10m
Replaced fast temperature sensor at 10m (t.ati.10m).
The signal was steady so we could calibrate it to
within +-.03 v
Rookie tower climber (gdm) was quaking in the wind.
- 193: FASTT , Site none, Mon 09-Mar-1992 23:34:50 GMT, FAST Ts DOWN:
FAST Ts DOWN:
Due to heavy winds and rain/snow the
fast T probes broke. The both failed at
21:10Z. Due to weather conditions, they will
not be fixed.
- 197: FASTT , Site none, Tue 10-Mar-1992 17:39:04 GMT, FAST Ts RUNNING:
FAST Ts RUNNING:
The fast Ts are running again. They
have not been calibrated since the winds are
high and the temperature is low, ie, it's
too cold up there at 10m!
17:30Z.
- 218: FASTT , Site none, Sun 15-Mar-1992 19:13:08 GMT, FAST T CALIBRATION
FAST T CALIBRATION
Yesterday, JD 74, at 2200 GMT we collected calibration
data on the fast T's that were put up on JD 70. This
data in $ASTER/projects/STORMFEST/doc/fastT.4m and
fastT.10m. It consists of alternating periods of operate
and calibrate with the chamber covering the sensor.
I edited the data file, removing a few points at the
transition, and then used the S function fun.fastT.cal
to average 10 points on either side of each transition.
For 4 m the results are:
> fun.fastT.cal(fastT.4m[,1],10)
$dT:
[1] -4.841818 4.823636 -4.799091 4.863636 -4.960909 4.785455 -4.882727
$avg: (of preceding transitions)
[1] 4.851039
$sd: (standard deviation of preceding)
[1] 0.0592595
Thus the calibration is 4.85 +- 0.06 deg C or 0.97 +- 0.01.
For 10m the results are:
> fun.fastT.cal(fastT.10m[,1],10)
$dT:
[1] -4.960909 5.005455 -5.041818 4.983636 -4.933636 4.978182 -4.997273
[8] 5.018182 -5.023636 4.994545
$avg:
[1] 4.993727
$sd:
[1] 0.03160085
Thus the calibration is 4.994 +- 0.03 deg C or 0.999 +- 0.006.
- 224: FASTT , Site none, Fri 31-Jul-1992 19:22:32 GMT, Logbook summary for platinum fast T sen
Logbook summary for platinum fast T sensors.
Fast T logbook references:
225 FASTT 03-AUG-92 FAST T cal params for post analysis
218 FASTT 15-MAR-92 FAST T CALIBRATION
197 FASTT 10-MAR-92 FAST Ts RUNNING:
193 FASTT 09-MAR-92 FAST Ts DOWN:
103 FASTT 18-FEB-92 Replaced fast temperature sensor at 10m
94 FASTT 13-FEB-92 REPLACED BROKEN FAST T AT 10m
86 FASTT 12-FEB-92 FAST T 4M
60 FASTT 08-FEB-92 FAST T CALS:
8 Feb (JD 39):
Platinum fast temperature sensors were located at 4 and 10 m on the
flux tower in conjunction with the new ATI.K sonic anemometers. They
were initially calibrated in the trailer on Feb 8:
sensor height gain Tabs Tref
S/N 29 10m 20.75 15.75 15.8
S/N 32 4m 26.37 21.37 21.4
Thus the gains were initially set at 5.00 V/5 deg C.
12 Feb (JD 43):
4m fast T broke at 0900 GMT and was replaced at 1500 GMT.
13 Feb (JD 44):
Replaced broken fast T at 10m around 2300 (?) GMT. No calibration.
18 Feb (JD 49):
Replaced fast T sensor at 10m around 20:20 GMT.
Calibration done within +/- .03 V.
9 Mar (JD 69):
Both fast T's broken at 21:10 GMT.
10 Mar (JD 70):
Fast T sensors replaced at 17:30 GMT.
15 Mar (JD 75):
Collected fast T calibration data and analyzed it with the
results:
4m:
4.85 +- 0.06 deg C or 0.97 +- 0.01
10m:
4.994 +- 0.03 deg C of 0.999 +- 0.006
- 225: FASTT , Site none, Mon 03-Aug-1992 14:49:56 GMT, FASTT cal params for post analysis
FASTT cal params for post analysis
The fast t's were initially calibrated to read 5 degC / 5 V. We will
use the mean of this and the second calibration results (see logbook
218) for the entire project.
4m:
(5.0 + 4.85) / 2 = 4.925 Volts
The fast t prep.config parameter for the linear calibration
function should then be: 5 deg C / 4.925 V * 100V / 65534 counts =
.001549 degC/count
10m:
(5.0 + 4.994) / 2 = 4.997 Volts
The fast t prep.config parameter for the linear calibration
function should then be: 5 deg C / 4.997 V * 100V / 65534 counts =
.001527 degC/count
These numbers were entered into the STORMFEST92 prep.config on Aug 3, 92
- 235: FASTT , Site , Fri 14-Feb-1997 22:08:40 GMT, Cal factors for fast T probes
The calibration factors for the fast T probes have been
updated for new version of aster calibration software.
t.ati.10m:
old cal: linear(0.001527,0.0)
from logbook entry 225, a value of 4.997 Volts (sic) was chosen
as the calibration factor for the 10m fast T probe. What this actually
represents is a cal voltage of .4997 V, using a gain of 10 degC/V,
and a filter/amp gain of 1.
The old cal factor of 0.001527 was computed as:
10 degC / V * 5V/32767 * 5/4.997 = 0.001527
So the new cal factor for the 10m probe will be:
5degC/ .4997V = 10.006 degC/V
t.ati.4m:
old cal: linear(0.001549,0.0)
from logbook entry 225, a value of 4.925 Volts (sic) was chosen
as the calibration factor for the 4m fast T. This is actually
a calibration voltage of .4925V.
The old cal factor was computed as:
10 degC / V * 5V/32767 * 5/4.925 = 0.001549
The new cal factor for the 4m probe will be:
5 degC / .4925 = 10.152 degC/V