Query on sample no. and rate of NI9233

[SSR_Nicholas]

I'm using NI9233 to acquire signals. Since the node 'DAQ assistant' only have inputs of no. of samples and sample rate. I thought the sample period equals to no. of samples/sample rate but couldn't always get the correct acquisition time. So what's the quantitive correlation of no. of samples and sample rate? How could I calculate the acquisition time once I set these two parameters?

Thanks a lot.  

[MarkGrot · Accepted solution]

The NI 9233 has a limited number of discrete sample rates as described in the specifications under "Data Rates".  If your chosen sample rate is not supported by the module, DAQmx will coerce to the next highest rate.  For example, a sample rate of 48kHz will be coerced to 50kHz.