Entry
| Date
| Title
| Site
| Author
| #Graphics
|
97 | Sat 22-Sep-1990 | Put AIR fast T's on UW sonics at 4 and | none | twh
|
161 | Thu 27-Sep-1990 | Fast T calibrations checked. | none | spo
|
176 | Sat 29-Sep-1990 | t.7m.uw | none | srs
|
249 | Sat 06-Oct-1990 | Calibrated fast T's from 1500-1600. | none | twh
|
259 | Sat 06-Oct-1990 | Mounted uw 7 m fast T at ~22:45. | none | twh
|
280 | Wed 10-Oct-1990 | Fast T cals: | none | spo
|
346 | Wed 17-Oct-1990 | Two fast T's (13m.ati and 7m.uw) went d | none | jmw
|
350 | Wed 17-Oct-1990 | FAST TEMPS - ati.13, uw.7 | none | jmw
|
537 | Sat 03-Nov-1990 | Replaced T' at 4m.uw at 22:20 GMT. Cali | none | jmw
|
542 | Sun 04-Nov-1990 | Replaced fast t probes on ati tower | none | twh
|
549 | Mon 05-Nov-1990 | uw fast t probes calibrated at | none | twh
|
557 | Tue 06-Nov-1990 | All fast T's are broken this morning. | none | twh
|
573 | Thu 08-Nov-1990 | Pt temps replaced. | none | spo
|
640 | Fri 16-Nov-1990 | Fast T's calibrated and removed. | none | spo
|
644 | Sun 18-Nov-1990 | FAST T calibrations, | none | clm
|
- 97: FAST , Site none, Sat 22-Sep-1990 02:54:21 GMT, Put AIR fast T's on UW sonics at 4 and
Put AIR fast T's on UW sonics at 4 and 7 m.
Had to redo the mounting for the fast T's on
these anemometers because they were too
flimsy for putting a cover over the probe in
order to calibrate it. Also had to bore out
rubber stoppers to fit over the mounting rod
and hold the cover for calibration.
Adjusted both fast T's around sunset so that
in the calibrate mode they read 500 mV
above the run mode. The accuracy of this
adjustment was probably ~ +/- 5 mV.
- 161: FAST , Site none, Thu 27-Sep-1990 19:16:26 GMT, Fast T calibrations checked.
Fast T calibrations checked.
During the last hour, Michael and Steve O. checked the Fast T calibrations.
Ambient temperatures read as:
UW (4m) 17
ATI (4m) 9
ATI (7m) 10
ATI (13m) 20
Psychrometers: 14-17
Obviously, the absolutes are off and will have to be changed later on.
With the cover tube on, all temperatures raised by about 10 C, taking about
2 minutes to stabilize. It would appear that the tube attained near body temperature
while being carried in my brest pocket up the mast, and that the incident solar
radiation was enough to prevent it from cooling significantly. This is more than
I would have expected.
-
Even with the tube on, fluctuations appeared to be about +/- 10 mv on the DMM
(read by Michael). Within this error, all of the sensors appeared to have correct
gain settings to cause a change of 0.5 V in "cal" mode. If it is necessary to
get better accuracy, look at the data file collected during this period. (The
above listing is the order in which the calibrations were done.) I held each
sensor in cal mode for about 10 seconds (expect the first - UW 4m, but I think
there is still enough data there). Since all bridges appeared to give the 0.5 V
change, NO ADJUSTMENTS WERE MADE.
- 176: FAST , Site none, Sat 29-Sep-1990 17:31:43 GMT, t.7m.uw
t.7m.uw
There is no transducer at this location.
Looking back at the logbook entrys, the fast t
sensors were adjusted by Steve O. back on the 27th.
There is no calibration information about t.7m.uw.
I would assume that since the 27th we have not had a
fast t at this location.
- 249: FAST , Site none, Sat 06-Oct-1990 16:37:23 GMT, Calibrated fast T's from 1500-1600.
Calibrated fast T's from 1500-1600.
Added 7 m uw fast T later in the
afternoon.
Tony covered the fast T's and then
Tom used cshow to read the output
in both `operate' and `calibrate'.
Decided not to readjust the bridge,
but to assume that the readings can
be used to proportionately adjust the
data:
operate calibrate difference
uw 4 m T, ragwort 100:
13.56 18.48 4.92
13.10 18.07 4.97
12.54 17.42 4.88
12.15 17.09 4.94
12.00 16.90 4.90
11.84 16.77 4.93
4.92 +/- .03
uw 7 m T, ragwort 101:
12.52 17.49 4.97
12.47 17.42 4.95
12.45 17.40 4.95
12.42 17.37 4.95
12.42 17.37 4.95
4.95 +/- .01
ati 4 m T, marigold 100:
5.05 9.70 4.65
5.15 9.77 4.62
5.25 9.90 4.65
5.43 10.05 4.62
5.24 9.86 4.62
4.63 +\- .015
ati 7 m T, marigold 101:
6.13 10.86 4.73
5.94 10.69 4.75
5.87 10.63 4.76
4.84 9.59 4.75
4.77 9.52 4.75
4.75 +/- .01
ati 13 m T, marigold 102:
16.90 21.85 4.95
16.23 21.18 4.95
16.18 21.13 4.95
16.05 21.00 4.95
15.78 20.75 4.97
4.95 +/- .01
- 259: FAST , Site none, Sat 06-Oct-1990 23:19:30 GMT, Mounted uw 7 m fast T at ~22:45.
Mounted uw 7 m fast T at ~22:45.
Added calibration information to
previous table.
- 280: FAST , Site none, Wed 10-Oct-1990 01:21:10 GMT, Fast T cals:
Fast T cals:
Cals done - marigold 100 (ATI, 4m) values were:
Chamber off: ~ 1400
Chamber on: 4500 - 7400
4200 - 7000 - 3600
3200 - 6200
(The higher values are in CAL mode.)
This was done about 2330
ragwort 100 (UW, 4m) values were:
Zero: 489
Chamber on: 5947 - 9146
5932 - 9116 - 5930
5926 - 9117 - 5932
5943 - 9133
5942 - 9127 - 5937 - 9122 - 5932 (delta ~3188 - should be 3277?)
This last run seemed the nicest - Wim switched between the cal and operate
positions twice, staying at each position for ~ 2 seconds, thus there wasn't
much drift.
- 346: FAST , Site none, Wed 17-Oct-1990 15:32:29 GMT, Two fast T's (13m.ati and 7m.uw) went d
Two fast T's (13m.ati and 7m.uw) went down
in last nights snow and winds. Otherwise all
instruments look good. 1m prop came back up
during the night.
- 350: FAST , Site none, Wed 17-Oct-1990 18:02:39 GMT, FAST TEMPS - ati.13, uw.7
FAST TEMPS - ati.13, uw.7
Two T's at ati.13 and uw.7 were replaced, and
SS and JB returned at 18:00 GMT. All T's now
appear to be working properly.
- 537: FAST , Site none, Sat 03-Nov-1990 22:38:00 GMT, Replaced T' at 4m.uw at 22:20 GMT. Cali
Replaced T' at 4m.uw at 22:20 GMT. Calibration may be
off. Switching between run and calibration modes gave
about 4.4 deg instead of 5.
- 542: FAST , Site none, Sun 04-Nov-1990 22:26:46 GMT, Replaced fast t probes on ati tower
Replaced fast t probes on ati tower
from 21:35 to 22:15. Covered each
and read output from cshow in both
calibrate and operate modes. From
8-10 samples, the gains are:
13 m ATI: 5.03 +/- .02
7 m ATI: 4.86 +/- .005
4 m ATI: 4.66 +/- .02
Note that the previous calibrations
similarly increased with height.
This will account to some degree
for the `observed' increase of
heat flux with height.
- 549: FAST , Site none, Mon 05-Nov-1990 17:28:19 GMT, uw fast t probes calibrated at
uw fast t probes calibrated at
16:53 to ~17:20.
uw 7m fast T: 5.03 +/- .01
uw 4m fast T: 5.18 +/- .01
- 557: FAST , Site none, Tue 06-Nov-1990 17:48:21 GMT, All fast T's are broken this morning.
All fast T's are broken this morning.
- 573: FAST , Site none, Thu 08-Nov-1990 19:52:45 GMT, Pt temps replaced.
Pt temps replaced.
ATI mast:
4m looks like it is working. Cals are: 3.41/7.97 3.35/7.91
7m wasn't working - BNC from sensor to bridge was bad (shield) in process
of fixing now.
Fixed. Cals are: 12.89/17.77 13.21/18.09 13.36/18.24
13m looks good now. Open air cal tried - is 5.0 +/- .1 C, as it should be.
Chamber cals are: 15.98/20.90 16.33/21.33 16.79/21.79 (pretty good!)
UW mast:
4m working: cals are: 17.22/22.66 17.26/22.70 17.29/22.70
7m working: cals are: 10.55/16.58 10.88/15.93 11.12/16.15 11.22/16.23
- 640: FAST , Site none, Fri 16-Nov-1990 19:57:47 GMT, Fast T's calibrated and removed.
Fast T's calibrated and removed.
~1100 (local) Steve S. covered the fast Ts.
~1200 (local) Calibrations were done, with files captured from cshow. Each file has
5 cycles of 1-2 seconds in both CAL and OPR modes. Shortly after the cal. test, the
probes were removed. The order of these tests was:
ATI 13, ATI 7, ATI 4, UW 7, UW 4.
Resistances were measured in the trailer shortly after for each of the probes. They were:
ATI 13 - 149.2
ATI 7 - 150.5
ATI 4 - 144.2
UW 7 - 147.7
UW 4 - 149.2
(I may have switched ATI 7&4, but I don't think so.) Note that all of these
readings are +/- .2 ohms or so.
- 644: FAST , Site none, Sun 18-Nov-1990 00:15:30 GMT, FAST T calibrations,
FAST T calibrations,
as per Steve Semmer
t.ati.13m delta-t
17.4033 22.4308 5.0275
17.4050 22.4300 5.0250
17.4125 22.4385 5.0260
17.4035 22.4090 5.0060
17.3890 22.4087 5.0200
s=0.009 avg=5.0209
t.ati.7m
13.973 18.7935 4.8205
13.9535 18.8740 4.9205
13.8660 18.7090 4.8430
13.8430 18.6435 4.8005
13.8015 18.7715 4.9700
avg=4.8709
t.ati.4m
2.9516 7.5200 4.5684
2.9445 7.4995 4.5550
2.9335 7.5000 4.5665
2.9300 7.4945 4.5645
2.9230 7.4865 4.5635
avg=4.5636
t.uw.7m
11.3710 16.4200 5.0490
11.3845 16.4295 5.0450
11.3900 16.4320 5.0420
11.3870 16.4225 5.0355
11.3750 16.4005 5.0255
avg=5.0390
t.uw.4m
17.6400 23.0600 5.4200
17.6175 23.0300 5.4125
17.5675 22.9720 5.4045
17.5265 22.9425 5.4160
17.5000 22.9200 5.4200
avg=5.4146