basic inverting amplifier

[lotus]

I am trying to simulate a circuit in ORCAD including basic inverting operational amplifier as attached.
Where R1 = 1k, R2 = 250k and input is 10mV. The opamp used is LM124. The output should be -2.5V but when I simulate it the output is -167.68mV. What can possibly be the reason of that much different output?

 

[Laplace]

The reason that happens in the real world is usually opamp input offset voltage and input bias current. Perhaps the SPICE simulator in ORCAD is taking into account the imperfections of real-world opamps.

 

[lotus]

Even offset voltage cant cause this much difference.