Gents,

Sharing.........

With my favorite UNI-T UT201E low-current capable clamp meter at 6 years old and started to drift by 2 amps at 24 amps ( 100A setting ), its time to get a newer one.

Full review is here :


and



I bought it from BangGood. Choose the one with ending B = Bluetooth version
https://usa.banggood.com/OWON-CM2100...S&currency=USD


- It has frequency and important one : duty cycle % , nice

- Bluetooth to OWON iMeter App.
3,000 data points maximum.
Fastest logging 3 data point per second. Slower 1 second per data point or much slower also available. Max still 3,000 data points in CSV file.

- Accuracy and stability for very low DC current is better than UNI-T 201E.
- The voltmeter has more digits too.


How long will it last and stable ?
I don't know but this seems a better build than my Owon B35BT+ DMM https://mbworld.org/forums/e-class-w...lti-meter.html



Frequency and Duty Cyle test. Since the video review did not include such test, here is mine :

Note, my cheapo PMW signal generator is decent but i do not believe it is accurate to 1hz frequency...LOL


45% duty cycle at 100hz. Reading is duty cycle %





Reading is Frequency, HZ.
I am too lazy to compare it with my Fluke 289, this is good enough. Supposedly 100hz and read at 98.xx HZ.





High amperage test at 100A range setting, DC amps. My power supply can only do max 24 AMPS.
Setting at 23.8A load. Owon CM2100B read out at 23.4 amps. Fluke 337 at 23.6A and the drifted UNI-T is showing 22.0A.


.

Setting at 23.8A load. Owon CM2100B read out at 23.4 amps. Fluke 337 at 23.6A and the drifted UNI-T is showing 22.0A.




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Can I get good low current accuracy, yes, it is easy on a wooden table with no magnetic metal.

On my car at negative battery cable to suspension strut, I get approx 10 -15mA disturbance ( guesstimate based on typical 5mA my car sleeping current consumption ) from the engine bay magnetic field. Still very impressive.
There is a technique to read this good near ferrous metal. I will post it in a few days time.



1.41mA Fluke 289. Owon 2mA




4.43mA Fluke. Owon 4mA




13.27mA Fluke, Owon 12mA




20.63mA Fluke. Owon 19mA


All above using 2A setting.


====================


Now 20A setting.

5.376A Fluke, Owon 5.27A. Drifted UNI-T 5.07A



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10 amps load

.




Readings :
Fluke 337 at 9.7A, Owon 9.75A and Drifted UNI-T at 9.45A





At price this CHEAP US$55 free shipping from China BangGood.or US$74.00 from Amazon USA , this is like how happy I felt when first time getting the UNI-T 210E baby current clamp 6 years ago,
which has no bluetooth , no duty cycle and no frequency HZ but is so good at low current DC and AC.


END OF REVIEW.

 

Thanks @S-Prihadi

I appreciate the effort you put into these reviews.

 

A lot of test gear are rated in labs with 20°C fixed temps because of silicone junction are sensitive to temp.
It's never simple to collect clean actionable data. Everything subject to interpretation & correction based on the test setup.
+/-5% is consumers all right
+/-1% is fantastic!
+/-0.5% is professional

Sometimes no data is the most accurate rather than sweating over decimals. Using a single tool carries the same error from test to test for comparisons.

There's a new automotive combo tool... "scope on a rope" ...nice features but really missing a touch UI to make it useable in a shop

 

Scope with small screen is no joy for my eyes .

5% accuracy for consumer level current clamp is OK, but drifted to 7-8% is no good.

One thing about the Fluke, they last long and stable for a long time.
All my flukes are 10+ years old, except the 177 DMM which I think its 6+ years.


For now the Chinese is doing better offering on low current DC clamp under US$70 than anyone else.
I wont mind paying 200% more money if they ca be build safer and better and UL certified.

Anyhow, if I do work on 230/400V 3 phase AC electrical panels with big bus bar, I will use my Fluke mostly, its CAT rating is UL certified,
while cheaper Chinese OWON or UNI-T most do not have 3rd party independent certification like UL, for their CAT II, CAT III or CAT IV.

 

Glad I can be of help. This product is indeed unique and will be useful.