Martel Electronics 235 - Manual (Page 27)

the last calibration point is entered, the next screen will be:
Enter the value in engineering units for the function you will be using
that represents the zero value for the calibration points function.
After entering the zero point, the next screen will be:
Enter the value in engineering units for the function you will be using
that represents the full scale value for the calibration points function.
After entering the full scale point, you will return to the overall Setup
menu.
Calibration points examples
Example #1: Programming a 5 point calibration for a thermocouple
transmitter ranged for 100 to 600 degrees. The calibration points
entered would be:
cal point #1 0 (%)
cal point #2 25 (%)
cal point #3 50 (%)
cal point #4 75 (%)
cal point #5 100 (%)
zero point 100 (degrees)
full scale point 600 (degrees)
Operation
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Zero point
value ???????
Full scale point
value ???????