FLAT90: SONICS Messages: 9 Entries..

Removed Gill anemometer about 15:00.  Prior 
to removing it, I blocked the signal, which 
should have put some reference voltages on 
the analog output. 
 
 

Moved level output from 13 m to 7 m 
at 00:25. 
 
 

Sonic zero tests: 
 
These are all pretty rough - there were typically LOTS of spikes with the zero  
chamber on and xstrip/marigold had problems in the middle of everything. 
Nevertheless, here they are: 
 
	   U	 V	W 
ATI.13  -.2   -.1    -.42 
ATI.7   -.03  -1.0   +.00 
ATI.4  -1.15  +.08   +.23 
 
None were done on the UW sonic, since xstrip now displays u,v,w 
instead of a,b,c.  Next time, we'll use rserial instead on 
these channels. 
 
P.S. These values are consistant with the values from graph_mean 
today.  Note that since the value of +1.0 for ATI.7.V was obtained from 
rserial it was negated as per the calibration routine. 
 
 
 
 

Sonic at ati.7m v component has noise. Looks like fine 
hash on an otherwise good signal. 
 

Read sonic zero winds with rserial, 
finishing at 19:20.  Charlie recorded 
samples of the output from rserial 
and placed them in the files  
results/ati/sat1.u, etc. and 
results/uw/suw1.a, etc. 
 
I plotted histograms of each sample with Splus. 
Most of the ati sonics had multiple modes with 
a spacing of 11-12 counts.  This indicates  
mistriggering with various numbers of false 
counts included in the 10 sample averages output 
by the sonic. 
 
Some of the ati channels may be okay.  The resulting 
means were: 
 
sat1.v:   -9.5 +/- 1.4 counts  (55 samples minus 8 > 0 counts) 
sat2.u:  -16.5 +/- 1.8 counts  (55 samples minus 2 @-5 counts) 
sat2.w:    0.2 +/- 0.5 counts  (55 samples) 
sat3.u:   -0.5 +/- 1.0 counts  (55 samples minus 4 > 5 counts) 
 
The uw sonics did not appear to have this problem. 
The resulting means were: 
 
suw1.a: -109.5 +/- 3.8 counts  (54 samples) 
suw1.b:  -16.7 +/- 3.9 counts  (54 samples) 
suw1.c:   12.7 +/- 3.0 counts  (54 samples) 
suw2.a:  207.1 +/- 3.1 counts  (45 samples) 
suw2.b: -151.3 +/- 2.9 counts  (45 samples) 
suw2.c:  160.3 +/- 3.2 counts  (37 samples) 
 
In all of the preceeding cases, the median values were within 
less than 1 count of the mean. 
 
 

ATI.7m played with 
 
I just did 2 things with this sonic: 
- reseated UR2, this fixed the -30 m/s values we were getting 
- ADJUSTED THRESHOLD on VR1.  I think I got it to where it should be - it 
  was on the edge, so I raised the threshold to get the next pulse. 
  No zero was done since the winds were too strong. 
 
 

sonics adjusted last night 
 
about 2320-0000 GMT, steve&steve went out to tweek the some sonic channels 
which were spiking.  The following channels were adjusted SLIGHTLY to  
lessen the number of spikes.  Note that the zeros shouldn't have been 
affected. 
 
- u.4m, w.4m, u.13m (I think) 
 
 

All u.ati's spiking heavily 
 
This is obvious this morning from xstrip on all ati.u channels. 
Winds are about 10 m/s directly along the u axis. 
 
 
 
 
 

level cables just switched from 7m to 13m