Tools

ITS-90 Reference Function Calculator

Select one of the 12 ITS-90 fixed-points from the keypad, or type a temperature between –259.3467 °C (13.8033 K) and 961.78 °C (1234.93 K) into the Temperature window and press Calculate. The calculator will produce the ITS-90 reference function value Wr) and the sensitivity (dT/dW) for that temperature. Wr is a resistance ratio (RT90/RTPW) that represents the ideal behavior of platinum resistance thermometers that meet the ITS-90 definition. dT/dW describes the slope of the reference function at the selected temperature and can be used to calculate the impact of an incremental change in temperature on Wr.

Thermocouple Table Voltage Calculator

Select one of the 8 letter-designated thermocouple types from the console, type any temperature within the thermocouples range into the Temperature window and press calculate. The calculator will produce the NIST thermocouple table value for that temperature along with the sensitivity or Seebeck coefficient (dV/dT).

Thermocouple Temperature Calculator

Select one of the 8 letter-designated thermocouple types from the console, type any voltage (mV) within the thermocouples range into the Thermocouple (mV) window and press calculate. The calculator will produce the NIST thermocouple table temperature value for that voltage along with the sensitivity or Seebeck coefficient (dV/dT).