hamed8419215,
You are right; but currently the RTD input is based on:
- a 200µA current source (around 80µV/°C for a Pt100),
- a ADC with integrated PGA and
- a microcontroller to control the ADC and to linearize the RTD response.
I know also that TC has ratio as low as 10µV/°C (type B). But as I have a PGA in the ADC, it would not be a problem.
FvM,
I am asking for advices for the analog part of the design. As you can read above, there will be a microcontroller for linearization.
So, my idea was to foresee all required hardware on the analog side to be able to measure cold-junction temperature and also provide the linearization.
Thanks, both, for your interest in my topic.
Thoma