Owon ODP3032 Power Supply OVP Issue?

[charlieb83]

Hello all,
I just received an Owon ODP3032 power supply and I think I'm seeing an issue with the over voltage protection as well as the constant current setting.  I must admit that I'm completely new to programmable power supply so I'm not sure if these are actual issues or just a part of normal operations.
What happens is that when I set the over voltage protection to a certain value, say 12.5 volts, the unit allows me to go over this voltage for several seconds before shutting the output off.  I can set the output to something like 22 volts and when the output is turned on, the voltage goes up to 22 volts, stays there for about 2 seconds, then the unit trips on the over voltage protection.
I would think the purpose of the over voltage protect would be to protect anything attached to the output and not allow to go above the set point at all.
Another issue seems to be with the constant current setting.  When I set the current output to a certain value, with a load on the output, I raise the voltage and the current value will increase past the current set point and the unit will not switch into constant current mode until the current is about 25 milliamps above the setting for the current.
Any thoughts would be greatly appreciated.
-Charlie

Here's an example video showing both of these situations:
https://youtu.be/Uq3iZc89DOs

[sotos]

Sent it back for a replacement.
It’s not working correctly.

[charlieb83]

Thanks Sotos, I thought something didn't seem quite right to me.

[Zbig]

Also to me, from the overall behavior of OV and CC modes you've shown, apart from the obvious faults, it looks like these modes are purely firmware-based. Almost as if instead of a proper analog comparator action happening there (and merely reporting to firmware after it does its thing), there was just some crude slow software loop checking for limit breach conditions once in a blue moon. Needless to say, that's not what you want from a lab supply and if my musings are substantiated, I wouldn't trust that design.