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Good clamp meter for low DC currents
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mzzj:

--- Quote from: HKJ on February 10, 2024, 07:53:34 pm ---
--- Quote from: mzzj on February 10, 2024, 05:23:32 pm ---Just tested out of curiousity the effect of current-carrying wires outside of the jaws: (Owon CM2100)

Conductor carrying 20A current causes visible 2mA error if closer than apprx 100mm to clamp end. If placed next to jaw opening the error is up to 50mA. Something to keep in mind if working in a crowded electrical cabinet or car wiring harness.

--- End quote ---

That is good, 0.01% error at 10cm is not much. In praxis you would not have 20A next to a clamp measuring mA. Except if you want to measure sensitivity, or you are a bit stupid (Sorry, but that is my opinion).


--- End quote ---
You don't always have the luxury of not having current carrying conductors next to clamp measuring mA's, ie previously mentioned car wiring harness.

And some other clamp meters are behaving lot worse:
Fluke 301D gives 0,3A error when jaws are next to conductor carrying 20A current. 6 times worse than the mentioned Owon.
Found out this accidentally in the calibration lab as 301D calibration results were all over the place compared to typical current clamps.
LeonR:
Just a heads-up: Owon skimped on the protection side of the CM2100/B when compared to the original model (Uni-T UT210E). I posted a video on the CM2100 topic: https://www.eevblog.com/forum/testgear/owon-cm2100b-is-uni-t-ut210e-inspired/
DaneLaw:

--- Quote from: LeonR on February 20, 2024, 10:12:06 pm ---Just a heads-up: Owon skimped on the protection side of the CM2100/B when compared to the original model (Uni-T UT210E). I posted a video on the CM2100 topic: https://www.eevblog.com/forum/testgear/owon-cm2100b-is-uni-t-ut210e-inspired/

--- End quote ---
No you didnt -  you more like reposted the exact same video that was posted months earlier in 3 posts above yours, even with a direct timestamp to the relevant circuit parts..
and where OP are even talking about the lack of protection after watching that exact video posted months earlier, but all that seemed to go over your head.?
DaneLaw:
A relatively cheap AC+DC clamp meter I have been puzzling about for the last ½ year is the Winapex 268B
- as it seems to have the current tolerances from Unit-T211B on the clamp with 0.1mA in AC and 1mA in DC while costing around 1/3 of the UnitT- UT211B.

Anybody tried one of these 268B ? - the price seems to be around 35€ [incl. VAT & delivery]






built-in battery (750mAh)  https://ae01.alicdn.com/kf/A1e8c66d9c3e34135b4e6c7ac5177fd0c2.jpg   & https://ae01.alicdn.com/kf/A40b01b1364e84150a4aaf693002f709f9.jpg
Martin72:
I consider only 2% tolerance in the 60A range to be unbelievable.
As a rule, current clamps of this type are less accurate with increasing current.
In addition, there is this strange "roller coaster" of tolerances in the ACA range.
1.5%, then 2.5%, then back down to 2%.
It's tempting to buy and test them. ;)
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