Why the TDMS file is bigger that we should

Hello

I write data rate simultaneously two analog channels to TDMS file to sample 10 kHz using the capture of data OR PCI card - 6111 12-bit.

Simply calculate:

10000 samples per second x 12 bit x 2 channels is 240000 bits per second = 30 kbytes/s = 1.8 MB per minute.

I have 766 seconds takes long recording, so it should be: 30 kbytes/s x 766 second = about 23 MB.

But my TDMS file takes 123 MB! and I have problem with these large treatment TDMS files, for example I have no memory of enogh for analysis of FOIA. Where is the problem?

Best regards

Kacper

DFGray,

You're right, I wrote the values of voltage in volts as waveform (DBL) of DAQmx, but number DBL is 64-bit, that's why my files was so great.

Now, I write not adjusted data represented as I16 (16-bit integer), and everything is ok.

It is possible to further reduce the size of the file using property DAQmx Channel node - http://zone.ni.com/devzone/cda/tut/p/id/3697#toc1

Kacper

Tags: NI Software

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