Uncontrolled sampling rate of NI 9235

[PChauns]

Hi,

      I am using NI9178 chassis for the strain measurements using NI 9235 strain module. I am having trouble in controlling the sampling rate. Irrespective of the sampling rate (as entered on property set up), it's reading the data quite frequently. For an example, I set the sampling rate as 1 S/s, but it's acquiring data at the rate of 794 S/s. How can I make it read the data according to sampling rate as specified in property set up? 

Thanks

Piyush

[MarkGrot · Accepted solution]

794S/s is the slowest the NI 9235 can acquire.  DAQmx coerces the sample rate up to the next possible rate.  Most of the time this is a very tiny coercion but for your module it is much more dramatic.  The module has a limited number of data rates.  See the Understanding NI 9235/9236 Data Rates section in the NI 9235 manual.

[PChauns]

Thanks a lot.