To measure Beta (hFe) of the transistor you should zero u_ce (voltage across CE for the AC component in signal). To zero that component you put capacitor in parallel with transistor AND as shown on the picture "b" a source of amplified (varying) signal ("e_g") in series with U_CC.
If I use my DC power supply to set Q point of the transistor, I plug it to black and red terminals on my little test board, then I should have "e_g" plugged right before a switch, so that pressing the button would apply DC + AC signal.
I know you can't do just that, as the voltage sources will eat each other, so how do I achieve that? Is the best option to use an op-amp, are there any possibilities available which do not involve op-amps?