Hello mukunda.mj,
The correction factor could be a number of things. The best way to determine where this number comes from is to look at the datasheet for the model of thermocouple you are using. It could be used as what is more commonly known as a "scale". That is, some voltage measurement taken by the thermocouple coorosponds to some temperature. For example, say a certain thermocouple has a voltage measurement of 100mV. Now lets say that 100mV coorosponds to a temperature reading of 38 degrees. Our scale would be 38 / 100 = 0.38. Now, if we take the same measurement of 100mV, we can multiply it by our scale of 0.38 we see that the temperature is 38 degrees. Similarly if our voltage measurement is 150mV and we multiply it by our scale we would see that the temperature measured is 57 degrees. Keep in mind that you should always pay attention to the units in which the scales are presented. Our scale for this example was in degrees / mV.
