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Hi,
You need to read and understand datasheets.
The NJM Opamp is completely unsuitable for this application in several ways.
* it needs at least +/-4V = 8V to operate properly
* it's offset voltage is higher than your expected input signal.(it's like you want to exactly measure temperature of 0...4° with a thermometer with an uncertainty of 5°)
And you need to learn about the input voltage range of an Opamp circuit.
Your schematic isn't clear where your input signal is referenced to.
Klaus
Having already multi mV range offset: surely not.is the lm224 operational amplifier suitable for this application?
But the Opamp in most of your cases is overdriven.these are the values i got. is this noninverting amplifier working?