Any experience with a cheap 10MHz current probe on Aliexpress?

[AlessandroAU]

Hi all, I was looking for low cost current probes to do some experiments with stepper and BLDC motors.

I found this on Aliexpress, has anyone bought one? I couldn't find any information online.

10MHz BW seems a tad optimistic.

http://www.aliexpress.com/store/product/CP-02B-10A-10MHz-AC-current-probe/617902_1942409389.html

Any experts want to contribute their thoughts?

[tom66]

I don't see a low frequency specification, which does not give me great confidence.

[Mark]

I don't see a low frequency specification, which does not give me great confidence.

"Bandwidth:5Hz~10MHz(-3db)"

[robert_]

I dont know...
But for motor drives, you could probably also live with a LEM LA55-P or similar transducer, these have about 200Khz of BW and are fairly accurate.
Its not a clamp but i think its not too hard to use on motor cables or such.

[AlessandroAU]

I dont know...
But for motor drives, you could probably also live with a LEM LA55-P or similar transducer, these have about 200Khz of BW and are fairly accurate.
Its not a clamp but i think its not too hard to use on motor cables or such.

Thanks for the part number! I wasn't aware of those. They might be even better as they can measure DC.

[0xdeadbeef]

You could also have a look at the sensors by Sensitec:
http://sensitec.com/english/products/current/cms3025.html

[Dd]

Be careful, it seems there are some fake CP-02B probes
Ali seller newswan03 "Newswan Tool & Instrument 03 Store"
https://www.aliexpress.com/item/CP-02B-10A-10MHz-AC-Current-Probe-Can-Connect-To-Oscilloscope/32859035881.html DO NOT BUY
Feedback quote: "Its a fake product. Check attached picture. It is a normal CT with burden resistance connected with BNC connector. "

ebay seller xux2007
https://feedback.ebay.com/ws/eBayISAPI.dll?ViewFeedback2&userid=xux2007&myworld=true&items=25&iid=-1&de=off&which=negative&interval=365
CP-02B 10A,10MHz AC current probe for oscilloscope,5mm Jaw size (#111731076639)
Feedback quote: "It is not worth the 45 dollars paid, the pcb comes empty. It doesn't work at all"
   
    

[nctnico]

Wow! 
That is just a piece of scrap PCB cut to size to hold the resistor in place. 

[bson]

 

[BillB]

Be careful, it seems there are some fake CP-02B probes
...

Sadly, I'm not sure that one is actually fake.  It's the AC only version of several of these CP-XX probes being sold by the same seller.  All the AC/DC variants (CP-07s) sell for much more, and have been discussed here for a while.  The CP-07s are mediocre at best, hand-built units.  I've got one and its ok.   

https://www.eevblog.com/forum/testgear/_cheap_-chinese-current-oscilloscope-probe/msg196087/#msg196087

https://www.eevblog.com/forum/testgear/acdc-current-probe-for-scope/msg1223596/#msg1223596