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ADS1256: Setting PGA does not give expected output results

Part Number: ADS1256

Hi,

I am using a board with ADS1256 on it. I've set Auto Calibration bit to 1 in the STATUS register. Problem is when I set PGA value to something else than 1, it does not give the expected results. For example, If I set PGA value to 16, It gives me a gain around 9-10. It's between 40-50 for PGA with 64 gain. There is also one more problem. The voltage value that I read from multimeters, does not match with ADS1256. There is always 2-3mV offset between these two. Even though I apply self auto calibration command, results does not change at all.