ARM91: SONICS Messages: 28 Entries..

Pre-arm sonic zeros: (done 2/13/91) 
 
Note that these were done after thresholds changed somewhat, but  
without changing the triggering point. 
 
SUW1:  A: -138 +/-3   B:  +11 +/-4  C:  +28 +/- 3 
 
SUW2:  A: +196 +/- 4  B: -164 +/-9  C: +170 +/- 9 
(Note: transducers switched: path B top&bottom) 
(Note: noise level is higher than SUW1 - possibly because of 
the extension to the transducer cables) 
 
SAT3:  U: +21 +/-.5   V: -86 +/-2   W: +79 +/-1 
(Note: the HC11 coefficients haven't been changed yet) 
 
 
 

Cables switched on ATI 
 
I had hooked up the sonic transducer cables wrong, which was causing v and w 
to be negative (and probably also responsible for the large biases I had seen). 
I switched VR1&VR2 and WR1&WR2.  This should improve matters greatly! 
 
Note that zeros on this sonic must now be checked again. 
 
 

All sonics look clean during this shift so far (since 0045 MST) 
 
Also note that I have changed the scale in preprocess.config to let c go down 
to 320 m/s, since it is about 329 tonight. 
 
 

ATI sonic has started spiking moderately 
 
UW.4m also has a few, now that the winds have picked up to about 8 m/s. 
UW.10m looks perfect (knock on wood!). 
 
 
 

SONIC SPIKES: 
 
	There has been some spiking on the 4m uw sonic 
thru out the day. The 4m ati also has spikes, mostly on 
the u component. 
 

GILL SONIC: 
 
	The Gill sonic was hooked up today. 
Only minor problems had to be dealt with. 
Proper calibrations have been entered into preprocess.config. 
Looking at cockpit, output signals agree with the ati sonic. 
 

ATI COMPARISON SONIC: 
 
	The ATI comparison sonic was added to the system 
today. Instead of speed of sound the last parameter is 
temperature. Eventhing looks good. 
 

SONIC SPIKES: 
 
	There were a few spikes on the uw sonics last 
night. 
The intercomparison sonics look good. 
 

Sonics status from xcockpit: 
 
I cleared these plots yesterday (about 16 hours ago) 
UW4 - 3 spikes 
UW10 - 1 spike 
ATI.NCAR - 16+ spikes 
ATI.ATI - clean, but no V! (but it was good sometime - it has gone bad during the last 12 hours) 
GILL - clean 
 

UW.4m has biases 
 
I think I must never have switched the receive cards for AT and AB back when I was 
working on it on Wed.  I just went out to the masts and switched them back - this means 
that the biases will be different for the first 2 hours of this IOP.  (Better than 
nothing?) 
 
 

All sonics are having problems now 
 
The Gill looks the best, followed by the UW.4m 
Lots of spikes on UW.10m, a few on our ATI, and the ati ati 
would look okay except that its sonic-temperature is  terrible 
(also V is still out on the ati ati).  Winds are now gusting 
to 15 m/s, and T is about -1C.  Snow flurries in the air. 
 
 

ATI - v component: 
 
	v component on the ATI sonic looks ok, using 
xstrip. Winds right now are quite light. 
 

SONIC SPIKING: 
 
	There is excessive spiking on the 4m and 10m 
uw sonics, on both the u and v components. There is 
also spiking on the ncar ati unit. The Gill and the ATI 
sonic look good. 
 

SENSOR STATUS: 
 
	Sensors look good. There was spiking throughout 
the night on the 4m and 10m uw sonics. Spikes occurred on 
both the u and v components. 
	The v component on the ATI unit was off scale at times 
during the night, while the other two comparison units were not. 
 

SONIC SIGNALS: 
 
	Since restarting cockpit, 08:00 GMT, the sonics 
are looking good except for the w component on the ati comparison. 
There was more deviation on its signal compared to the others. 
 

v.ati.ati has just gone bad 
 
The temperature has just dropped from 0 to -2 C.  Just in the last 2 xcockpit scans,  
v has developed -5 and -10 m/s spikes - looks like its headed offscale. 
Temperature looks a bit spikey also, but not terrible (on the large scale). 
As of the 3rd scan, v is offscale except for a few spikes. 
 
All other sonics look good. 
 
 

w.ati.ati and t now bad also 
 
They are very noisy w.r.t. the other sonics.  w varies 1 m/s peak-to-peak, while 
our ati is 0.4 m/s and t varies 7 C pp vs. 1 C. 
 
U still looks okay! 
 
 

ati.ati sonic back alive on all channels 
 
T = -1 C now - I've made a bunch of plots documenting the failure.  It definately 
tracks with temperature, v going out at -4C. 
 
All other sonics haven't spiked at all this shift. 
 
 

ATI SONIC WORK: 
 
	Gary Zimmerman is working on the ATI sonic at 
this moment. He replaced both the v and w transducer pairs. 
 
follow up: Gary finished working on the sonic. He could not find 
any obvious reason for the failure. This was expected since it 
appeared to be a temperature problem. He adjusted the pots to 
accommodate the new transducers. Work was completed at around 
19:00 GMT. 
 

SONIC CONDITIONS: 
 
	Some spiking has been going on on the 10m 
uw sonic. This has been on the v component. 
Since Gary worked on the ati sonic everything up to now 
has looked good. 
 

Strong winds around 2400 on JD 60 caused 
spiking on NCAR ATI and 10m UW sonics. 
 
 

SONIC SPIKING: 
 
	There were a few spikes, throughout the night, 
on the 4m and 10m uw sonics, v component. 
 The ncar ati had a number of spikes on all 3 components. 
The ati sonic looks good, so does the gill. 
 
 

SONIC SPIKES: 
 
	There has been a lot of spiking on the ncar ati 
sonic today. Mostly on the w component and little on the u. 
The ati soinc looks ok with a few soikes on the w. 
 

SONIC SPIKES: 
 
	The u component of the ncar.ati.comp 
sonic has been spiking throughout the day. 
The uw sonics have had a few spikes showing on 
the speed of sound computation. 
 

NEW SCRIPTS FOR SONIC COMPARISON 
 
Wrote two new scripts for plotting the 
4m sonic means and covariances for 24 hrs, 
sonics_mean and sonics_cov.  They are 
used as 
sonics_mean    
and  
sonics_cov    
 
 

NCAR ati sonic  
the u comp of the ncar ati sonic stopped spiking sometime between 9:30  
and 10:00. 
 
 
 
 

ati channel v shows strange behavior, possibly 
related to the cold temperatures. Seems 
to have a low frequency drift. 
 
 

Sonic status: 
 
10m uw sonic had a few spikes evident on the 
speed of sound output.  NCAR ati on the u component 
(and speed of sound).