Multisim simulation of Op-Amp with positive feedback

[nihobbist]

Hi, there seems to be a problem with Multisim when simulating Op-Amp with a positive feedback. I am expecting the output will saturate to VDD and VEE. But it gives a scaled input, as if it is treating the circuit as a scaler. Can you explain why the output does not saturate with the positive feedback?

[benmarforces]

You use AC Power Source, try with AC Voltage Source, It works.

Don't ask me why, maybe an NI employee could answer that!

Regards