Thank you very much Richard !

Now I see that 100 iterations overflowing a word var, so I'll use 10 iteration or DT Average routine, but nevermind right now.

I know it's unpleasant to ask beginners an advanced but you can explain me how its made middle 16 bits of multiplication calculation, please ? ( mvolt = tc */ 1249 )

Also I'm confused about "40 deg = 4500 mv would be a 921 count" , the maximum scale what I need is 1750 mV, 40 deg = 900mv ( 40 deg = 400mV + 500mV = 900mV) .

Please do not mind that I ask so many aberrations, but for me there are things I could not understand ...I'm old man and also beginner in programming.