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Change calibration algorithm #22

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mhu merged 1 commits from issue/21-calibration into dev 2020-11-16 18:45:00 +01:00
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doc/source/firmware/pt1000-processing.rst
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@ -132,7 +132,7 @@ and
.. doxygenfunction:: adc_pt1000_get_resistance_calibration .. doxygenfunction:: adc_pt1000_get_resistance_calibration
:outline: :outline:
are used to set the reistance calibration internally. For a guide on how to calibrate the deivce, see the corresponding :ref:`usage_calibration` usage page. are used to set the resistance calibration internally. For a guide on how to calibrate the deivce, see the corresponding :ref:`usage_calibration` usage page.
The calibration is calculated the following way: The calibration is calculated the following way:
@ -147,13 +147,13 @@ The calibration is calculated the following way:
OFFSET [label="Offset", description="Offset Correction :math:`O`"]; OFFSET [label="Offset", description="Offset Correction :math:`O`"];
OUT [shape=endpoint, description="Corrected Value"]; OUT [shape=endpoint, description="Corrected Value"];
LF -> SENS -> OFFSET -> OUT LF -> OFFSET -> SENS -> OUT
} }
The final calibrated PT1000 resistance is calculated as: The final calibrated PT1000 resistance is calculated as:
.. math:: .. math::
R_{PT1000_{corr}} = R_{PT1000_{LF}} \cdot (1 + \sigma) + O R_{PT1000_{corr}} = (R_{PT1000_{LF}} - O) \cdot (1 + \sigma)
The default values, if no calibration is loaded / executed, are: The default values, if no calibration is loaded / executed, are: