Ok this is what I see now.
After inductive spike at the beginning, there is a 300 msec event of negative going voltage on output. voltage ranges are 262,5 mV for CH1, 62,5 mV for CH2 and around 400 mV for CH3.
I presume that is negative offset needed for PSU to be true 0 output, before digital part sends calibrated zero to analog part of analog board.
That is very interesting, and it is there.
That voltage is probably not going to damage anything, only problem is that it seems to be without current limit at the time. So if you have very low impedance on output, it can pull many amperes...
It is definitely there but it probably will not damage anything because of very small voltages..
I don't really care, because for years I was working with old PSU's, some of which had no output disable. So I never power up PSU with outputs connected.
Of course that shouldn't be necessary, and brings me to my few real complaints to DP800 series:
1. They should have put relays that disconnect outputs.
(I'm thinking of making small piggyback board that will control 3 relays of the On/Off leds in enable buttons)
2. OVP is in software and not in hardware and is very slow. Even in software it could be done in few msec after A/D conversion with some clever programing.
3. If you setup OVP at 3V, and then go to channel and set output to 30V it will let you. Not only that, it will let you ENABLE the channel, that will send 30V to that channel for few hundredths of msec before OVP will kick in. That is easily avoidable in program. And will definitely evaporate whatever is connected to that channel.
So I just presume there is no OVP on it. I use external crowbar if I think it's needed. I also make it a point to use 8V CH (CH1) for logic/low voltage stuff..