If I want the conversion of thermistor's resistance to temperature to be as accurate as possible, should I refer to a table or use the Steinhart-Hart Equation?
I am in doubt because a table contains many reference points and thus with interpolation you should be able to get an accurate result. On the other hand, by measuring resistance at 3 different temperatures, you get an approximate relationship between R and T for the exact unit you are going to use, and not a general set of data as is the case in a datasheet provided table. On the other hand, it is still just an approximation of a very nonlinear function. If thermistor tolerance is critical in answering this, I would assume a 1% tolerance.