Data acquisition rate differs from sampling rate?

Hi everyone,

I am working with a cDAQ 9171 chassis and a NI 9775 DAQ card.

I am performing a continuous data acquisition measurement with a sampling rate of 100Hz and a sampling size of 100 samples/channel. My understanding has been that this would yield 100 data points every second. However, I receive 100 data points around every ~0.3s. 

Am I missing anything here?

Best and thank you in advance