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Understanding AD7799 calibration

Question asked by scottdky on Jul 5, 2017
Latest reply on Apr 10, 2018 by scottdky

I am trying to understand what the four calibration constants mean, and how to use them:

 

1) If I want to perform a calibration, do I first perform both zero and full-scale internal calibration, followed by the external calibrations? If so, what is the purpose for both?

2) What do the four values mean, exactly?

3) If I want to save the calibration to use when starting up again, do I need to save and restore all four values or only two? I tried restoring only the external ones after performing an internal calibration and the data being read was very wonky. I wouldn't think the internal cal values wouldn't change significantly after a reset.

 

Thanks,

Scott

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