Change Input_range for PCI6115 in C++

[GeorgeLiu]

Hi
I am using MSVC++ to program the PCI6115.
I am trying to DAQ some kind of low voltage (<1V), Seems that 6115  always use the defaut range(+/- 10V ,I guess) to DAQ the signal. I 'd like to use smaller range (+/-1V or +/-0.5V).
I tried to change the input range using AI_Configure function  but it does not work.(I just change the inputRange parameter for the AI_Configure function).
I also tried  to change the gain parameter in the DAQ_START function.  The values after DAQ  are  just the original values multiplied by the gain. The  resolution or the result is still the same.

I search this forum but still cannot solve this problem.

Can anyboby help me out?

Thanks.
GJ

[Brooks_C]

Hello GJ,

I think that you may find these two KnowlegeBase articles helpful:
How Do I Configure an S Series DAQ Board for the Full Input Range So It Does Not Clip? 
How To Set Up Gains For My DAQ Card In C++ And LabVIEW?

It looks like you'll want to use the AI_Setup function to do this.  I hope this helps and have a great weekend!

Cheers,