Hi Manuel, Just so that I'm clear, are you using the ADS1231REF for these experiments, or do you have your own board? One consideration is when calibrating with with a 5kg weight, you are only calibrating 1/10th of the total range of the 50kg load cell. Gain and offset errors will be much more pronounced because of this calibration. Generally you would like to calibrate at or near the maximum weight to be applied. Most likely the issue you are seeing is related to some sort of thermal drift which could be related to either the load cell or the ADS1231 . Discovering which one is causing the biggest issue may be challenging. Instead of using the 5kg weight as calibration, I would suggest using raw codes and do a no load and 5kg load measurement and track the raw codes. Compare the results for when the system is warm, and then compare to a cold system. Best regards, Bob B
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