[Jon,Tyler]
We noticed that the RTD temperature readings given on the Cymac were off, and traced the issue to miscalibration in the relationship between the resistance and temperature of each RTD (Callendar-Van Dusen eqn). Below is the table of values inferred from independent measurements of temperature and resistance to rectify this problem. This data was then fitted to better determine the coefficients present in the temperature-resistance relation:
R_0 (ohm) Alpha Beta
RTD 0 80.8674 0.001315 4.273e-6
RTD 1 79.5704 0.001887 3.7873e-6
RTD 2 81.7334 0.002014 2.1724e-6
RTD 3 74.3060 0.003677 3.6022e-8
RTD 4 81.1350 0.001761 2.3598e-6
RTD 5 77.9610 0.002423 -7.5192e-7
RTD 6 78.7980 0.001373 6.2909e-6
RTD 7 83.8616 0.001890 3.3529e-6 |