## Additional Information

The scaling type of a thermocouple measurement is defined as either

**Polynomial** or

**Table**. The scaling type used in a thermocouple acquisition will determine the range of temperatures that can be accurately calculated from the measured raw voltage values.

For

**Polynomial**, the measured voltage values are scaled using an Nth order polynomial equation. For most thermocouples, the equation for converting voltage to temperature is the following:

where

*t90* is the temperature in degrees Celsius,

*E* is the voltage in millivolts, and

*Di* is a coefficient determined by the thermocouple type and temperature range. The accuracy of a polynomial fit greatly reduces after a certain range, so the DAQmx

**Polynomial** scaling type will only let you set a min and max temperature that is known to be accurate for a given thermocouple.

By setting the scaling type to

**Table**, a wider temperature range can be measured for K, N, T, B, and E type thermocouples.