Unless you have a better then 1C temperature reference, I would not bother trying to get a higher absolute accuracy then what you get using nominal data sheet info. If you need a true high accuracy temperature reference, use a thermal couple or Platinum temperature sensor (RTD).

If you want to try this anyways:

1. The reference voltage, if your info is correct will cause way more error then the 3% Beta error and 5% resistance error.
2. First line of calibration would be to verify the resistance at the specified 25C, since the manufacture specs 5%.
3. Then work on the 3% Beta drift... Assuming you need accuracy over a large range beyond near room temperature.

Also consider purchasing a better spec'ed NTC to save your self some time. You can find 2% Beta, 2% Resistance or better for not much more then yours.

Unless you have a better than 1C temperature reference, I would not bother trying to get a higher absolute accuracy than what you get using nominal data sheet info. If you need a true high accuracy temperature reference, use a thermal couple or Platinum temperature sensor (RTD).

If you want to try this anyways:

1. The reference voltage, if your info is correct will cause way more error then the 3% Beta error and 5% resistance error.
2. First line of calibration would be to verify the resistance at the specified 25C, since the manufacture specs 5%.
3. Then work on the 3% Beta drift... Assuming you need accuracy over a large range beyond near room temperature.

Also consider purchasing a better spec'ed NTC to save your self some time. You can find 2% Beta, 2% Resistance or better for not much more than yours.