AD623 Thermocouple Amp

I'm trying to amplify a type-J thermocouple signal with the AD623.

I've tried multiple different configurations but nothing seems to work the way I want it.

I would like to see a gain around 100 so I have a 1K resistor on pin 1 and 8.

I have the negative input grounded, and my reference is also grounded.

I'm not seeing any voltage change on the output yet i've created a simulation with multisim and it works just fine.

Is this the proper amp for the job?

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  • Thank you Gustavo.

    I'm not looking to directly measure temperature. Also, I"m not worried about cold-junction compensation. I would just like to reliably amplify the TC and read the value into a microprocessor.

    I'll take a look at the links.

    I've also updated my circuit to reflect what's shown on page 20 of the manual. Amplifying Signals with low common mode voltage

    My Reference is set to 2v yet my output remains at 2.01 volts though the manual says I should be getting between 1.11 - 3.07v.

    Is my output still saturated in this mode?

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  • Thank you Gustavo.

    I'm not looking to directly measure temperature. Also, I"m not worried about cold-junction compensation. I would just like to reliably amplify the TC and read the value into a microprocessor.

    I'll take a look at the links.

    I've also updated my circuit to reflect what's shown on page 20 of the manual. Amplifying Signals with low common mode voltage

    My Reference is set to 2v yet my output remains at 2.01 volts though the manual says I should be getting between 1.11 - 3.07v.

    Is my output still saturated in this mode?

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