Thermocouple Tables: ITS-90 From NIST
Thermocouple tables or thermocouple calibration tables are just that, tables of dc millivolt output for a thermocouple type. They are usually given in one degree increments referenced to either 0°C or 32°F according on the whether the Table is in Fahrenheit or Celcius.
It is also possible to develop mathematical formulae, called polynomials (of the
forms V=a + bT + cT^2 +dT^3 +eT^4+...... and T=A + BV + CV^2 + DV^3 + ET^4.....)
relating output voltage to temperature or vice versa. In this way the calibration
table and its inverse can be stored in a computer algorithim and used to provide
a temperature reading when receiving a voltage signal from a thermocouple, or
in generating a voltage to be used to simulate a thermocouple output, for example,
in testing a meter or data acquisition system. One of the principle sources for
these polynomials is found in the publication linked below.
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