When reading an RTD temperature using an ADC, the following topology is usually used:
Most guidelines insist that a precision resistor (0.1%) be used for RREF (inside red rectangle). I believe the reason for this practice, is to use the full range of the ADC device (correct me if I'm wrong). Would any problem arise if I don't need to use the full range of the ADC and I use a normal resistor with 5% accuracy instead of a precision one? Keep in mind that a full scale system calibration will be performed and I have also performed all calculations to make sure nothing goes outside the acceptable limits of the ADC.