I used to get help before in this site.
I was really good. and there was no problem.
but another problem is occurred.
I have a problem when I calculate a temperature from a K-type thermocouple data.
To get the temperature by thermocouple, I got two temperature a "cold" junction and "hot" junction temperature for the thermocouple as follow the 7124 datasheet.
my calculation is as follows:
total_temperature = Hot_junction + Cold_juntion
but when I heat the "cold" junction, the total_temperature is changed.
My developed controller has the cold-junction inside. So when i supply power, the controller is heated
and total_temperature value is changed.
My question is :
1) is the calculation right?
2) Does the thermocouple has the feature that the total_temperature always get effected by the "cold" junction temperature?
3) If number 2) is right, how can i reduce effect of the "cold" junction?
4) Does Other controller by thermocouple has these feature?
thank you for reading despite my weak English skills.