This post?
https://forum.arduino.cc/index.php?topic=394842.0
No time to read through all those posts, so I might give the wrong advice.
I gathered from your first post that you want to measure the temp inside a reflow oven with a themocouple and AD595. And that you have temp stability problems.
You basically can't measure temp or voltage accurately with default Aref (5volt).
But Arduino has a perfect inbuild reference voltage (1.1volt Aref).
All you have to do is call this reference voltage in setup, drop the output voltage of the AD595 with a voltage divider to <1.1volt, and change the temp converter maths line from 5.0 to ~1.1volt.
I might read all those posts later, and correct this one if needed.
Leo..