TL082-Q1: TL082-Q1 schematic review

Pin 3 is connected to pin 4, but the input common-mode range does not include VCC−.

You probably want the LM2904B-Q1 or LM2904LV-Q1, depending on the supply voltage.

See section 5.4 of Understanding Operational Amplifier Specifications. The TL0xx cannot measure a voltage that is near VCC−; you need a different opamp.

Everything else (unused amplifier, decoupling) looks OK.

Hey Mason,

I agree with Clemens' comments. Additionally, this topic is explained in the following TI precision labs video https://www.ti.com/video/4620557492001

This specification is called input common-mode voltage. This is range of input voltage where op amp output voltage will behave linearly.

In the Electrical Characteristics table, with +/-15V supply, linear input voltage range is 15V (V+) to -12 (V- + 3V). This means that V- is not in the linear operating range of the op amp.

Best,
Jerry