I did a standard inverting operational amplifier (UA741), with Rin = 6k and Rf = 1k.

![Text](https://upload.wikimedia.org/wikipedia/commons/thumb/4/41/Op-Amp_Inverting_Amplifier.svg/300px-Op-Amp_Inverting_Amplifier.svg.png)

I have a lab power supply, with 30V of difference for the amplifier.

I don't understand why this doesn't work, it should be Vout = -Vin/6 but I measure Vin = Vout = V-(AO).

I put Vin between 0 and 10V for instance, static, and voltage measurements are made with a standard voltmeter. I tried with several new op amps and it's the same problem.

![Text](https://i.ibb.co/SmZqy11/elec.jpg)