Graphics refresh rate and the writing of text problem - error 5

Hi guys,.

I'm new to labview and have encountered some problems when I try to write to the file.  I use USB-6259 with Labview 2009 to acquire a number of channels I want to analyze later in MATLAB, all at the same time providing some limited analysis in real time.  The experience is to use lasers to calculate the position of a rotating cylinder.  I wrote a quick vi using the DAQ assistant to acquire channels and provide a polar diagrams showing the counterclockwise movement as it turns what is ideal.  The problem is that, because the cylinder rotates at up to 6 Hz, graphical needs updated very quickly I realized by using a buffer size lower compared to the sampling freq (sampling freq between 5 k and 10 k, buffer around 200).  This does not seem the best solution.  Also, when I try to write in the text, the following error is displayed after a few seconds:

Error 5 has occurred writing to measure file-> Displacement_Rig.vi, or the possible reasons:

LabVIEW: File already open.
=========================
NOR-488: Command requires GPIB controller system controller.

Can someone point me in the right direction?  I tried to create a loop of producer/consumer, but I'm not convinced that it works with my limited expertise.  I attatched my vi, although I warn you, I'm new to labview...

See you soon

Hello Ipaza,

I watched your VI and found that there are has some problems in the architecture of your consumer producer loops.

You can get a pre built loop producer consumer using the templates on the start screen.

I copied the majority of your code in such a model. Could you test this and let me know if this solves some of the question.

With regrads,.

Tags: NI Software

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