How often should a calibration be implemented in a system?
To determine the frequency of calibrations within a system, consider:
Taking these three questions into account will give some indication as to how often a calibration is required.
Other system parameters should also be considered when determining how often to calibrate. These are all related to circuit sensitivities to temperature change as follows:
Parasitic thermocouple effects.
Gain drift due to the reference temperature coefficient.
Drift sources external to the converter.
In general, the higher the accuracy requirement, the more often a calibration will be required in order to maintain system accuracy. After a calibration has been performed, high-resolution converters like the AD719x will have some offset and gain drift associated with them.
In accessing the complete effects on accuracy due to temperature, the temperature effects due to parasitic thermocouples and drift sources external to the converter also need to be factored into the equation.
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