Resistance uncertainty
Introduced in: rtd-acquire 0.1.0a1
Measurement.standard_uncertainty_ohms is the acquisition layer's optional
place to report a standard uncertainty in the resistance result.
A numeric value means the acquisition path has quantified that contribution in
ohms. None means it has not supplied a quantified value.
None is not zero
Absence of a quantified uncertainty does not imply perfect measurement. It only means the acquisition result does not carry a standard-uncertainty estimate.
Keep uncertainty layers distinct
This field concerns the acquired resistance. If an application later uses
rtd-sensor to convert resistance to temperature, that package can propagate
resistance uncertainty through the selected RTD model and combine it with other
model-level uncertainty contributions.
That separation makes the provenance of uncertainty clearer: acquisition hardware establishes resistance uncertainty; RTD modeling establishes how that uncertainty affects temperature interpretation.