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60W Electronic Load in 2022
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DavidDLC:
Has anyone recently bought a 60W Electronic Load that is calibrated ?

Like the attached model on the picture.

I bought one from Amazon, but it was off by 20mA. Then I ordered a replacement and the same, it was off by about 20mA.

Long time ago I bought one that was spot on.

Please let me know if you got a good one and from where and if you were able to confirm it's calibration was good.

David DLC

janoc:
You want calibration (I guess you mean accuracy?) on a 20€ device??  :-DD

And why do you even need this gizmo to be that accurate?  That thing has a specified accuracy 0.7% - 0.01A - 10mA, with minimum current being 20mA.
So given how "optimistic" these "specs" tend to be (and how cheaply designed these loads are in general) I would say your 20mA error is totally in line with what the device is designed to do. Also, don't try to actually use it for 60W, it will almost certainly blow that FET.

If you need more accuracy then either put a multimeter in series to adjust it - or you need to spend quite a bit more dosh on a more sophisticated load.
DavidDLC:
"Long time ago I bought one that was spot on."
thm_w:

--- Quote from: DavidDLC on December 06, 2022, 12:00:25 am ---"Long time ago I bought one that was spot on."

--- End quote ---

Random luck.

If you don't have the money, reverse engineer the circuit and figure out if you can put a pot in somewhere to tweak the value.
If you have a few more dollars get one of these: https://www.eevblog.com/forum/testgear/cheezeball-dc-load-dl24p-pump-or-dump/
If you want an actually trusted calibration, buy a load from a major manufacturer, which will likely be $300+
alm:

--- Quote from: DavidDLC on December 05, 2022, 11:37:42 pm ---Has anyone recently bought a 60W Electronic Load that is calibrated ?

--- End quote ---
A calibration is a documented comparison to a traceable standard. So if you had a DMM with a traceable calibration, compared its reading to the load, and wrote up a document about how you did the comparison, then that might be considered a (non-traceable) calibration. Companies like Fluke do that for a fee, but that fee will be much more than the €20 you apparently pay for the load. So asking for a calibrated €20 load is asking a lot.

What are the specifications for the load? Maybe 20 mA is offset is within specification? Does it allow adjustment? Then my suggestion would be to adjust it to whatever standard you have.

If the device doesn't allow adjustment, then it's likely just a lottery what offset you get. Try ordering from a different seller, maybe you'll get one that has -20 mA offset, and you can hook two up in parallel for a net zero current ;)
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