The two terminals are connected to the two ends of the K-type thermocouple. The concept of virtual short and virtual disconnection is clear, but it does not count as a magnification, please advise.
Isaac 發表於 November 26, 2020
LM193? Is there a mistake?
Lucas 發表於 November 26, 2020
Regardless of whether the op amp model is correct, the magnification is not easy to calculate from the circuit alone. It is (R10+R17)/R, and R is the equivalent resistance of R19/R20/R22. Just use the simulation software to see it
Jackson 發表於 November 26, 2020
A very simple signal conditioning circuit, it is easy to get the result with the virtual short of the op amp.
It is in-phase amplification plus a negative level shift R10/R17*Ua.
