I just bought a cheap lab power supply (Korad KA3005P). It works as advertised so far, but in looking at the output on an oscilloscope, I have about 100mV of overshoot when I enable the output. The voltage rises very smoothly (looks like a capacitor charging curve), but continues past the set voltage by 100mV or so, then looks like a damped sin wave that goes a few cycles until it settles on the desired voltage. The first half cycle of the overshoot lasts somewhere around 5ms. I get this whether I have a load or not. It happens at any voltage, is not influenced by OCP or OVP settings, and is not influenced by the current set point.
Is 100 mV a reasonable amount or is this supply defective? If I set my scope to 5V/Div, the curve looks perfect (like in Dave's re-review of the unit). Once I get to 100mV/Div, the ringing overshoot is very obvious. I am just trying to gauge whether this is more or less normal for this particular supply.
Thanks,
Len