DAQmx logging takes data only available for last second...

Hello

I work on a VI to measure a voltage signal with an acquisition of data USB-6361 (sample rate 150kHz) and stores the data (see VI below). I had to use DAQmx functions due to data loss problems, and so the DAQmx logging feature is used to store the data.

I added a "calendar function" to set a length of time and measure specific departure. Since I don't have the program stores only the last second (150000 data points), although total samples acquired increase according to the duration of the measure, while the program is running.

I was watching my VI for some time now, but I can't understand why it is not store data correctly. Can someone give me an indication of what is problem with my VI?

There should be an expectation in your outer loop to slow down everything in check for the time.  Also, there may be a conflict in your cheques to timeout.  If the time-out reaches 0 when it verifies he could run the inner loop once and stop the outer loop, where your sample question once.

I would also say to change your configuration of the strings so that your set things only once instead of slow reading loop every time that you enable it.  You may not really need to start and stop your task each time.  This can be done at the beginning and end of your program.  Unless you plan to change the settings.

I assume you are using LV2012.  The seal must be LV2012.

Tags: NI Software

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