I am using OPA2137 in a non inverting configuration. I have 10Koham in the negative input and 100Koham in the feedback for 11X amplification. I am using +9V and -9V batteries to power the amplifier. In order to test the setup I feed the positive input with a 100mV directly from a function generator at frequencies below 1kHz. I feed both the output and the input signal from the function generator to the scope so I see them both simultaneously.
The output signal follows nicely the input, centered around 0, but there is no amplification. In fact the output signal is 20-50 times smaller then the input (100mV).
What could cause such an effect?