Sampling Rate Question

[Geotech_Jordan]

Hello,

I have been using an NI cDAQ-9188 with 2 NI 9324 modules to collect data. Using LabVIEW 2012 SignalExpress under DAQmx AcquireI I set the sampling rate to 250Hz and the samples to read to be 250.
When I output the logs to an ASCII file it says the dt=0.000605. With 250Hz I would be expecting 0.004. Any idea what the cause might be?

[Gregory]

Hi Jordan, I'm not familiar with SignalExpress, could you post some screenshots of what you are doing?

[GerdW]

Hi Jordan,

when in trouble you should read the manuals!

The samplerate given on page 6 fits to your 0.6ms dt value…

[crossrulz]

As GerdW was getting at, the slowest rate that the 9324 can sample at is 1.65kS/s/CH.