i got one of these from a contest at element14. the current reads 5mA under what it really is. anyone else experiencing this? thank you!
Have not received mine yet but apparently MP710086/P4305 can be calibrated:
https://www.eevblog.com/forum/testgear/increase-accuracy-of-owon-p4305-dc-power-by-self-calibrating-in-hidden-menu/
ooh, cool, thank you!
Edit:
after much fiddling with the current calibration and all 5 of my multimeters in series since i don't have a very trustworthy meter, i got what to me is an acceptable result.
from 0 to 3mA there is a 5mA offset that the supply doesn't read. from 3 to 10mA there is a 5mA offset correctly reported by the supply's meter. from 10 to 18mA the set point is a tiny bit off from what the supply's meter reads, going back and forth from +1mA to the actual reading i get with my meters, which is the same as the set current.
from 18mA to 3.25A the reading and the set point agree perfectly and they perfectly agree with most of my meters, 2 of which read the same value, and the other 3 reading a few microamps off from each other, and from 3.25A to 5A there is a steady linear increase in current from 100uA to 5mA from what the supply reads, but it reads the same value it's set for, the difference lies in my meters.
before, it was a constant 5mA offset for most of the entire range, and the supply's meter read the same as the set point, so it was off by -5mA. now i'm getting a much more accurate reading across the entire range, and from 18mA to 3.25A it's pretty much right on target, and since most of what i do is within that range, that's perfect!