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Member dheeraj2102
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dheeraj2102
Posts: 38
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Analog Input

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‎05-31-2012 02:13 AM

Hi !

 

I'm acquiring an analog input using an R-series FPGA card in a PXI device.

 

However, the input is giving junk values. On trying to connect a 12V battery, it shows a value 32767 and remains stationary there. I have changed the integer representation to I64 everywhere, but the problem still persists.

 

I am assuming we need to calibrate the values obtained into useful data. However, it looks like the input value is reaching a maximum and staying there. Please suggest.

 

Thank you.

Dheeraj Bharadwaj
IIT-Madras
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Member Matteo_Orciari
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Matteo_Orciari
Posts: 18

Re: Analog Input

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‎06-06-2012 04:55 AM

The input range for an R-series FPGA card is -10V,10V.

The input resolution is 16 bit, so with any voltage >=10V you get ((2^16)/2)-1=32767.

You can't measure 12V with that setup.

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