Nardelli,
Could you provide some additional details concerning your setup? The SCXI-1112 has a maximum sampling rate of 333 kS/s. Thus, most likely, the program that is controlling the hardware is determining the sampling rate. Which development environment are you using? What type of programming structure are you implementing with regards to the SCXI-1112? Single-point acquisition (software timed)? Buffered acquisition (hardware timed)?
Spencer S.