You CANNOT see ripple in a voltage only readout. Ripple is the transference of ac current in the sine wave readout. Which is what looniam was talking about. An oscilloscope shows said voltage at said frequency and then looks for ripples along the wave and there's a readout that shows max min and median wave variations. These you absolutely cannot see without using the correct tool. I don't care how much money you spend on a "multimeter".