Reduce the size of a file created by "write to waveform.

Hello

I'm using labview in 2012 and I have a problem with the size of the tdms file generated by the function "write to waveform. The data is real time 16 channels in a series of X NI USB-6343 and is composed by the gains of the voltage on the y-axis with the absolute time on the x axis (waveform format). The size of the file is reached a Go command within a few hours. Is it possible to reduce the size of this file? All configurations on the component?

Thanks for the help.

Best regards

Marcelo Nobre

Yes indeed, there is a better way.  Instead of using writing on file express VI measure, try adding the DAQmx logging into your task DAQmx (before starting the task):

This method writes the raw binary data unadjusted to the file (2 bytes per sample because it is a 16-bit data acquisition card) with scaling of information in the header of the file.  In the example you posted, you write the data which are already put across to the file (double 8 bytes for example).  What will make this change you expect to reduce your file size by ~ 4 x.

If you wish you can compress the files once you have finished writing to them for further reduction of size, but there is no support to achieve so that you are currently writing in the PDM file.  In addition, you will need to unzip the file until you can access the data in the .tdms file.  You can probably get good results with something as simple as the data stored in a .zip file.

Best regards

Tags: NI Hardware

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