Impossible to pass data in an iteration

I started down this road on a post a couple of weeks, but he's not the right direction. It turns out that the problem I have is that my tasks finish creates a file that is too big to fit in an iteration. My reading DaqMx is within a certain time so that it can operate in parallel with other operations and has been configured to read all loop samples (samples read the value - 1) then stop the loop when it export the data to a queue (who writes a .tdms file).

I'm looking to acquire 48 channels on average about 1 MHz for a second (there are three tasks to different speeds and lengths), and this has created a low-memory error unless I have that reduced to less than half this number of samples. The solution was to only read 1 million samples at a time and leave the playback loop to iterate until all three DaqMx reads error, which causes the loop stop. This allows me to acquire data much more, but when I look at my channel names are missing. It seems that the data is all there, but everything is Untitled.

So, how can I get all 300 MB of data out of my task done without losing the channel names?

Hey Deskpilot,.

Sorry for the confusion. What happens if you have configured your loop to stop when you have sampled all of your data rather than wait until you generate an error. For example, if you want total samples 100 and 25 samples time each through your while loop, have your time stop loop when your loop iteration Terminal is equal to 3. In this way, you are always sampling every 100 samples but do not rely on the DAQmx Read for error to stop your loop.

Maybe it's a bit of a work-around. But with my initial play with her, she seems to do the trick for the elimination of the extra data field "Untitled."

Tags: NI Software

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