[etherlab-users] Data Transfer options in TestManager

[Alex C. Marton]

Dear friends at EtherLab community,

Thank you for giving me another chance! This time I will not let you down!
I have been using TestManager in a real industrial hydraulics application for a 
while now. I generally had good results with it, but now I wish to change my 
sampling rate and also the accuracy of the data captured (I was using 1000 Hz @ 
2 accuracy which is too high). I have tried doing so but I see the following 
observations about the options that I can set/choose:
a. the sampling rate cannot be any value I wish to choose for all channels. I 
tried sampling @ 300, 450, 720 Hz and always TestManager rounds off my value to 
a different one, a calculated one I see, so it must implement a formula I do not 
know about. I would like to sample @ 10 Hz in my application which I see it can 
handle,  but I do not know why an intermediate value for the sample rate is not 
possible.
b. The data accuracy I choose is  not "recorded" while using the Scope. I tried 
inputting different values from 1 to 9 and then verifying the .txt files 
generated by exporting the acquired data in a Matlab format. Most of the time I 
get values with 16 digits after the "." in the number. Other times I get values 
with only 2 decimal points. I see the files are a lot larger when having 16 
digit accuracy than when I have 2 digit accuracy and I would like to have 4 
accuracy, because space is an issue for me.
c. What is the effect of a high "Buffer Size/s" in the Data Transfer option 
pane? I already know the effect of having it too small (the graphics of the 
signals are limited), but I would like to know what is the drawback of having it 
too large? One thing I notice is the Data Rate going very high. What is an 
optimal value for that to input?
My Data Rate I read here right now is  70-80 Kb/s @ 300 Hz. Does this have an 
effect on the topics I've written so far?

I would like to thank you! For everything!
Kind regards,
Alex Marton


      
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