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Can the differential amplifier circuit of this K-type thermocouple work normally?

Hardware design
July 30, 2020 by Kelli 1473

Now we need to use a K-type thermocouple to collect the outside temperature. According to the differential amplification example provided by the IC Data Sheet, build the following circuit diagram. I don't know if it can be used. The accuracy of external temperature measurement is 5%. Ue0=(1+2R1/R2) * (Ue2-Ue1), this formula is under the conditions of R1 = R5 and R3 = R4 = R6 = R7.

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Adela Posted on July 30, 2020

C3, C4, and R8 are not used. Connect a 1K resistor to GND for thermocouple 1 and 2 pins respectively.

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Imran Posted on July 30, 2020

Connect a 1K resistor to GND for thermocouple 1 and 2 pins respectively. In this way, when the measurement is higher than zero, can it be guaranteed that Ue2 is greater than or equal to Ue1?

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Benny Posted on July 30, 2020

The internal resistance of the thermocouple is very low, no problem. Or increase these two resistances to ground to 10K.

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