Max sampling on the 9208 - Flat line issue

[DamianGRIFF]

Hello,

I have an issue on my 9208 with CDAQ 9132 running Linux RT v25. 

I am getting flat line repeating values, when I am trying to record data at 10Hz. I have set a background sampling to 30 Hz, which should provide enough of a buffer based on the max sample rate of 500s/s over 16 channels. 

Any idea if this is normal, and I'm unable to sample this fast or is there something going wrong with the buffer, timing etc. 

Attached screenshots of the data I'm getting at 10Hz. I dont have Labview to carry out full testing or changes to the module, but have NI Max and NI DAQ Express

[ZYOng]

Are you using the high resolution or high speed mode?

NI-9208 Specifications - NI

Enable High-Speed or High-Resolution Mode for C Series Modules

Disclaimer: I don't use DAQExpress and don't know how this property can be configured in DAQExpress.