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?
What's happening is that the output is saturated. You need to drive the REF pin to some voltage inside the operating range of the output. By the way, in case you missed it, we do have a family of In Amps for thermocouple applications (which include the cold-junction compensation). Take a look at AD8494 and AD8496
In addition, you may find the following links useful:
The Diamond Plot
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Instrumentation Amplifier Tool - Common Mode vs. Output Voltage (Diamond Plot)