Calibration
The Calibration menu option will allow the user to calibrate the inputs on a board. Click on the click value to begin the calibration process.
The user will need a thermocouple calibrator capable of outputting a thermocouple signal to calibrate the zero, span or cold junction value of the analog input board. The user will need to connect the calibrator to one of the inputs on the board that will be calibrated. It is recommended to let everything (calibrator and input board) sit for approximately thirty minutes to allow the temperature to achieve equilibrium. Set up the calibrator for the specific thermocouple type of the thermocouples in the analog input board, i.e. type K, type J, etc. Then, source a specific temperature, like 1000 °F, or millivolt to the connected input. It is recommended that the actual temperature used be similar to an appropriate process temperature. For example, if your equipment normally operates at 1700 °F, then perform the cold junction calibration using a 1700 °F signal. It is important to note that when performing a zero or span calibration, do not use regular thermocouple wiring. Instead, use any kind of regular sensor wire, or even regular copper wire. To perform the calibrations, the user will need a calibrator that is capable of outputting volts, millivolts, and temperature.
Below is a listing of the suggested ranges for the various TC types.
TC Type mV Range Chart
TC Type Range in mV
B 20
C 40
E 80
J 80
K 80
N 80
NNM 80
R 40
S 20
T 20