I've connected an instrumentation amplifier (INA118) with a gain of 5000 in order to multiply that gain with the input voltage difference. The gain resistor is set to 10 ohms, according to the datasheet:
G = 1+(50kÎ©/Rg), âˆ´"‹ G = 5001.
I'm using a virtual ground as the reference voltage, it's set to 2.5V. The positive voltage is 1.4 above that reference and the negative input is 0.5V below that difference.
Correct me if I'm wrong, but the output voltage shouldn't be (V+) - (V-) * G? So, 5000(1.4V-0.5V)?
If I measure the output voltage with a multimeter and measure the voltage reference (with respect to ground - 0V), the measure I receive is exactly the same. It is not amplifying, Vref = Vout.
What am I doing wrong? Here are my schematics: