[etherlab-users] TestManager Sampling rate + accuracy issue

[Alex C. Marton]

Dear all,

I have a problem with the data acquisition in TestManager. 

First of all, my specs:
etherlab 1.2-rc10
My linux version is: openSUSE 11.2 "Emerald" - Kernel \r
My RTAI version is 3.7.1
Matlab is R2009b, Simulink version is: v 7.4 and RTW is: v 7.4

Now, I have just learned through experimenting that the "fundamental sample 
time" in the configuration Parameters in my Simulink model i have built, is 
actually the maximal sampling frequency that will appear in TestManager , in the 
Data Transfer option for every channel. This is quite a find for me because 
nobody explains this stuff anywhere! The Testmanager documentation is in German 
(lol!), all I have is an english translated documentation for TestManager 3.4 
which is not good at all.
Ok, now that I finnaly can sample at the sampling rate I want, next step is to 
choose the accuracy for each channel, right? Not quite! Well it turns out that 
whatever accuracy i put in there (3,4...9) and then trying to acquire some 
channels using the Scope, and then exporting the acquired data in Matlab-format, 
Testmanager never respects/maintains the accuracy number i put in there. For 
example if i select 1000Hz sampling time + 3 accuracy  (3 digits after the "." 
in the number) for a channel, then after exporting, Testmanager just spits out 
data @ 1000Hz with 16 floating point digits after the "." in the number. This of 
course has serious impact because for 10 seconds of data i get files of 11-20 mb 
for 1 channel -> aka not good!
May I ask you: "what is going on?" because I have no idea. 
Thank you for your time!


Alex M.


      
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