Joseph, Thank you for your fast answer and my late reanswer. Like you recommended, we are using the supply of the bridge as the external reference. Our job is to calibrate a PT1000 temperature measurment system. In fact of this we are doing a consideration of uncertaintys in our measurment chain. We are not sure which errors in the ADC are offsets and which are errors like the INL. In conclusion we are interested in the Errors which we can't calibrate out because they are random. Sönke
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