Earlier this week I got myself the small model (DL3021), and had a quick play with it today. Just to get a feel for the instrument.
First impression was: Damn... That thing is big and heavy. At work we have some of the Maynuo 300W loads, and they are small and light as a feather in comparison.
After playing with the various modes, I got the impression it does pretty much what it says it does. There are some weird quirks here and there though:
First the graphical view of current, voltage or power. It draws the newest value to the left, and then scroll the graph to the right. Like a scope running in reverse.
That one is going to drive me bonkers.
I had a couple of weird incidents where the load did not do what I asked it to do. One time in constant power, where I had it happily pulling 100W from a power supply, and while adjusting the voltage and current limits of the PSU (not touching the load), it suddenly went to 1W power draw. I could change the power setting on the screen, it still drew only 1W. I turned the input off (it did so), and back on... Still 1W. Only when going to another mode like CC, and then bak to CP, it came back to life and pulled the power I set it to.
Another similar bug was in battery test mode, where the current was 0.1A no matter what I set it to. Go to CC mode and back and the problem was solved.
And lastly: Why the heck is there a short circuit button near the input on/off button? It may be a convenient function when testing power supplies, but one accidental push of that button while I have a Lithium polymer battery pack connected?!?
At the very least it should be possible to disable that button in the settings. Hopefully they will add that in a firmware update.