Read empty return Sets

All,

I have the code attached to a loop of a VI.  I run this code about once per millisecond during tests (~ 30 sec) short.  She usually works well, but sometimes read funtion returns an empty array.  When she did this, 'AvailSampPerChan' returns 0.   Why would he do that?  Should not be expected samples available before reading?  Is there a simple way to stop this and wait for the samples to be filled?

It is not return an active error when this happens.

System Specs:

Acquisition of data USB-6009 8 lines AI at a sampling frequency of 3000 s/s of reading.

Any help would be greatly appreciated.

No, you really should have the Schedule VI.  Otherwise your DAQ is served only when you ask in the software.  If you really need the 3kS/s, it must be hardware timed and keep the value of the samples.

What determines your rate of loop for when you read the DAQ data?  Think you can try to obtain data more often than the data actually happens.  You say you're looking for data on every 1ms.  At a rate of 3kS/s, you should have 3 samples available.  But that's assuming only 1 channel.  The heat flow is actually samples/channel/second.  Thus a full analysis will be in 8s /(3kS/s) = 2.7ms.  You try to read these data too quickly.  Slow down your loop.  Or set the frequency of sampling to 24kS/ml/s.

Or say that the DAQmx read to get X samples when you try to read the data.  As I said earlier, the default value is simply enter all available data (- 1).  If there is no data, you get no data.  However, if you specify a number of points to read the DAQmx Read, he will wait that number of samples coming.

Tags: NI Software

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