Nrf51822 ADC Result Error

[james]

  Hi,I had developed a production which has a feature similiar to power bank. I had configured the adc with 10bit resolution, full scale, internal 1.2V reference.I found that the result of adc is 6~10 when the adc channel port connected to the ground directly. I thought the reult should be 0 in that case. The result (6~10) is error? Is there any solution which can correct that error?

[Kenneth]

Hi, this is likely due to offset error in the ADC, you should find some threads on how to calibrate for offset and gain error already in devzone, for instance:
https://devzone.nordicsemi.com/f/nordic-q-a/4517/how-to-calibrate-the-nrf51-adc-to-correct-offset-and-gain-error 

[james]

thanks, I had search it in devzone with the wrong key word, so I didn't get the answer. I know how to do with it after taking a look of the instance.