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Range for NI 9205 using MATLAB

Hello,
The NI 9205 comes with the 5 different input voltage ranges, how does one change the range from MATLAB?

After changing the range does the 16 bit resolution scale to this new range? for ex for -1 to 1V, step size will be (2/(2^16))?

 

Also the sample rate is given as 250kS/s does that mean for each second, I get 250k different 16bit values for all the inputs? if not what does the sample rate actually mean?

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