cDAQ Module Sample Rate Low in DAQExpress

Updated Jan 10, 2019

Reported In


  • NI-9221


  • DAQExpress

Issue Details

I am trying to measure a voltage on my NI-9221 using DAQExpress. When reading a single channel for the device, I see a recorded waveform sampling rate of 400 kHz. According to the device datasheet, the sample rate should be 800 kS/s aggregate and therefore 800 kS/s for the single channel. Why am I seeing a lower sampling rate for this module?


In DAQExpress, tasks have a default sampling rate set in the Task tab of the task window. To adjust this sampling rate, under the Timing sub-menu, Deselect Auto Managed Timing. From here, you will be able to set the sampling rate in the Desired Sample Rate control.