Acquisition using waveforms info incorrect when time gives the writings in PDM

Hi all, in most of my daq applications, I am interested in phenomena rather slow (temperature and static pressure) more than 30 to 60 channels as well as two or three instruments series for a very long time (for example: a few days or weeks). In general, I also calculate values based on the acquired data. I had used 2D charts to achieve, but the discovery that defines metadata inherent with the type of waveform data extremely useful for organizing my data. I've attached a screenshot of my typical acquisition using waveforms code.

The problem that I notice, is that the time stamp at the end of the data set is never correct. By example, if I start a test at 08:00 Monday and you complete it at 16:00 Tuesday, when I remove the PDM file data and he draw on a waveform chart the final stamp displayed could be from 19:00 Wednesday 15:00 or Monday or some other time nowhere share near real-time the trial was stopped. I suspect it has something to do with the parameter "dt" waveforms, but so far I have not been able to understand. What I am doing wrong? Thank you.

It seems that the lu daqmx VI indeed default dt = 1 when the instance of "N chan Samp wfm 1" is selected.  Switching to continuous sampling and parallel loops with a queue has solved the problem.

Thanks for your help!

Tags: NI Software

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