FLAT90: Logbook Entries

FLAT90: FAST Messages: 15 Entries..

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Entry Date Title Site Author #Graphics
97 Sat 22-Sep-1990Put AIR fast T's on UW sonics at 4 and nonetwh
161 Thu 27-Sep-1990Fast T calibrations checked. nonespo
176 Sat 29-Sep-1990t.7m.uw nonesrs
249 Sat 06-Oct-1990Calibrated fast T's from 1500-1600. nonetwh
259 Sat 06-Oct-1990Mounted uw 7 m fast T at ~22:45. nonetwh
280 Wed 10-Oct-1990Fast T cals: nonespo
346 Wed 17-Oct-1990Two fast T's (13m.ati and 7m.uw) went d nonejmw
350 Wed 17-Oct-1990FAST TEMPS - ati.13, uw.7 nonejmw
537 Sat 03-Nov-1990Replaced T' at 4m.uw at 22:20 GMT. Cali nonejmw
542 Sun 04-Nov-1990Replaced fast t probes on ati tower nonetwh
549 Mon 05-Nov-1990uw fast t probes calibrated at nonetwh
557 Tue 06-Nov-1990All fast T's are broken this morning. nonetwh
573 Thu 08-Nov-1990Pt temps replaced. nonespo
640 Fri 16-Nov-1990Fast T's calibrated and removed. nonespo
644 Sun 18-Nov-1990FAST T calibrations, noneclm


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