Kinkin 182 electronic load calibration - Page 1
Forum section: electronics / testgear

author: Jedward
author_rank: Newbie
timestamp: February 08, 2020, 12:57:47 am
content: I have a Kunkin 182 power load unit that seems to be out of voltage calibration. Measuring against 2 other meters, I'm seeing about a 100 mv difference with good leads, connections, and no load. Is there any known calibration procedure to fix this?

author: maginnovision
author_rank: Super Contributor
timestamp: February 08, 2020, 02:07:50 am
content: With no sense wires I wouldn't bother trying to calibrate it, it's going to be wrong any time you use it.

author: Gregg
author_rank: Super Contributor
timestamp: February 08, 2020, 02:18:03 am
content: You may be interested in this thread:https://www.eevblog.com/forum/testgear/fixing-an-manufacturer-issue-of-the-kunkin-kp184-electronic-load/The metering on inexpensive power supplies and loads is usually more of a reference for ballpark values and if you need better figures a known good meter or two will give far more accurate values.

author: interflexo
author_rank: Regular Contributor
timestamp: April 22, 2020, 11:09:25 am
content: Good video on Kunkin KP184 basic two point voltage calibration procedure:

author: burkm
author_rank: Regular Contributor
timestamp: February 20, 2022, 04:24:59 pm
content: Hi,I just bought a brand new Kunkin KP184, "calibrated" during production on Oct 19 2021 and have installed the latest firmware available (end of July 2021) by myself.During testing of the unit I got some voltage readings, which where a little outside stated specs and even with certificate data provided by the manufacturer.What made me wonder, when looking through the setup parameters, that the voltage sensing was set to "remote". Because of the observed voltage differences shown by my multimeter (6 1/2 digits DMM), I set the sensing circuitry from "local" back to "remote" again and installed the needed BNC cable for this. The observed values look a lot more now what my lab DMMs says. I just wondered, because the calibration video presented on YouTube was shown without remote sensing visible (and no corresponding cables present).The calibration manual available on the internet states 10V and 80V (like the provided test certificate) needed for voltage calibration plus 2A and 25A needed for current calibration. This would make me buy additional equipment for just doing this, because my lab power supplies do cover only max 30V / 70V DC voltage plus 3A max for the current. I will do some further testing, but because of the observed situation will probably refrain now from doing my own calibration (may be lateron...), due to the expenses this would cost me...Note: If I interpret it correctly, the manufacturer provided BNC connector plus cables are for a remote sensing cable...PS.: My KP184 was delivered packed in a bag with the original box plus acccessories, although the original box wasn't that sturdy but rather basic in strength, but no transparent bag around the unit itself as shown in some videos. It seemed to have survived transportation without any visible problems, marks or dents nor fingerprints, seal still intact on the unit.A protective foil on the front panel display was present, which I removed. My only complain: one of the electrolyte SMD-capacitors was almost touching that rail on top of the main board. I bent and resoldered that part of the rail, to get rid of any future problems this might cause. Additionally I put some cable ties on those cables visible to tidy it up...PPS.: I will try to get rid of some of the ripple reported by some owners of the unit (haven't tested it yet on mine). I will try to warp the already interleaved cables (my unit, see photo) onto an inductor and have the fan-cable stored away as far as possible from the (4x) power cables feeding the units transformer output to the load. Will see, if that helps...

author: tac0man
author_rank: Newbie
timestamp: March 31, 2022, 08:20:13 pm
content: I think that you are able to choose your own calibration points. I used 4v and 60v as my reference points and am now getting reading much closer to what they should be.