[etherlab-users] TestManager Sampling rate + accuracy issue

[Dr.-Ing. Wilhelm Hagemeister]

Dear Mr Marton,

if you don't like the TestManager you can bring it back to the shop and
you get back what you payed for it...

If you want to have answers for your questions I would advice you to ask
them in a more polite way...

Regards Wilhelm.

Am 14.12.2010 11:38, schrieb 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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