What is end point and best straight line fit Calibration methods?
In the end points match calibration method, the 4 mA and 20mA corresponds to the lower temperature and higher temperature of the specified range. For example for the 0-400 oC range, the 4mA = 0 oC and 20mA = 400 oC. Where as, in case of the best straight line fit calibration method, the non linearity of the thermocouple or Pt -100 curve is distributed on either side of the straight line drawn between 4 and 20mA. This will minimize the 4-20mA error due to non-linearity of the curve.
