Products > Test Equipment

300W DC Load: Korad KEL2010 or Tonghui TH8402A ?

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nctnico:

--- Quote from: trp806mo on July 20, 2023, 12:18:09 pm ---I don't have any boot failure on my (home) Siglent but I'm more annoying with its high (normal?) ripple during the regulation.

Regarding Tonghui we wanted to buy one DC load too some years ago but we couldn't do it as they haven't any CE certificate for the office.

@Nctnico, what do you want to know/be checked on the Korad model ?

--- End quote ---
About the Korad model: I'm interested to know whether it works and if there are any kind of known issues (firmware bugs). I noticed the Korad can be connected to a network. Do you have any experiences to share on how that works?

Martin72:

--- Quote ---but I'm more annoying with its high (normal?) ripple during the regulation.
--- End quote ---

Depends on the regulation type.

trp806mo:
ok, I'll upload a short review this week

nctnico:

--- Quote from: Martin72 on July 20, 2023, 01:35:24 pm ---
--- Quote ---but I'm more annoying with its high (normal?) ripple during the regulation.
--- End quote ---

Depends on the regulation type.

--- End quote ---
I checked the Siglent SDL1000 manual but can't find any way to adjust loop bandwidth. Then again, a current sink/source has a very high impedance to start with so it is hard to stabilise the voltage using a voltage control loop. If the voltage control loop hasn't been dampened enough, a true current sink will make it oscillate quite easely. In other words, the ripple is likely an effect of the source and load interfering. I have experienced this before using cheaper DC loads.

BTW: I used to have a self built DC load that used transistors as an open-loop (no feedback) near ideal current sink. This thing was handy to test the regulation of power supplies. Unfortunately I blew it up and couldn't find suitable replacement transistor as the transistors I used came from a switching PSU and where custom parts / marked with custom part numbers. In hindsight I got super lucky that these transistors worked at all in a linear application; these transistors must have had an exceptional DC SOA area!

Martin72:
Would like to see what he meant, is it while a loadstep...

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