How can I read > 10X samples at a sample rate of X?

[DieselPower]

When I set up a task to read a finite number of samples, I'd like to be able to read for 120 seconds at my selected rate.  When I try to read for what would take longer than 10s (sample count > 10 * sample rate) I get an error.

I realize that I can run this task 12 consecutive times, but this is not preferred due to the overhead time loss in between each call to ReadMultiSample.

Thanks.

[crossrulz]

We need a lot more information in order to help.  What sample rate are you using?  What DAQ card?  What is the error?

My guess (purely a guess) is that you are overrunning the DAQ buffer.  My approach would be to use the Stream to TDMS and then post process the data.

[Dennis_Knutson]

And if you used continuous mode instead of finite samples, you can put the read in a loop with no loss of samples or the overhead you have with finite sample mode. Assuming of course you don't have much else going on in the loop.

[Mcdan · Accepted solution]

If you are not explicitly setting the timeout input on the DAQmx read VI, it will default to a timeout of 10 seconds.  If you want to do a single finite read, you should probably use your sample rate and your number of samples to compute a reasonable timeout for DAQmx read.

Dan

[DieselPower]

Wow.  Fastest and most brute force response ever.  I'll update the timeout duration and report back with my findings.  Thanks!

[DieselPower]

This worked.  Thanks!