Any experience with a cheap 10MHz current probe on Aliexpress? - Page 1
Forum section: electronics / testgear

author: AlessandroAU
author_rank: Regular Contributor
timestamp: December 23, 2015, 03:09:23 pm
content: 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.htmlAny experts want to contribute their thoughts?

author: tom66
author_rank: Super Contributor
timestamp: December 23, 2015, 05:57:18 pm
content: I don't see a low frequency specification, which does not give me great confidence.

author: Mark
author_rank: Frequent Contributor
timestamp: December 23, 2015, 06:21:51 pm
content: Quote from: tom66 on December 23, 2015, 05:57:18 pm"Bandwidth:5Hz~10MHz(-3db)"

author: robert_
author_rank: Regular Contributor
timestamp: December 23, 2015, 06:51:31 pm
content: 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.

author: AlessandroAU
author_rank: Regular Contributor
timestamp: December 24, 2015, 11:31:40 am
content: Quote from: robert_ on December 23, 2015, 06:51:31 pmThanks for the part number! I wasn't aware of those. They might be even better as they can measure DC.

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: December 24, 2015, 12:14:02 pm
content: You could also have a look at the sensors by Sensitec:http://sensitec.com/english/products/current/cms3025.html

author: Dd
author_rank: Contributor
timestamp: July 30, 2018, 08:39:28 am
content: Be careful, it seems there are some fake CP-02B probesAli seller newswan03 "Newswan Tool & Instrument 03 Store"https://www.aliexpress.com/item/CP-02B-10A-10MHz-AC-Current-Probe-Can-Connect-To-Oscilloscope/32859035881.htmlDO NOT BUYFeedback quote: "Its a fake product. Check attached picture. It is a normal CT with burden resistance connected with BNC connector. "ebay seller xux2007https://feedback.ebay.com/ws/eBayISAPI.dll?ViewFeedback2&userid=xux2007&myworld=true&items=25&iid=-1&de=off&which=negative&interval=365CP-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"

author: nctnico
author_rank: Super Contributor
timestamp: July 30, 2018, 09:38:06 am
content: Wow!That is just a piece of scrap PCB cut to size to hold the resistor in place.

author: BillB
author_rank: Unknown
timestamp: July 30, 2018, 11:59:57 am
content: Quote from: Dd on July 30, 2018, 08:39:28 amSadly, 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/#msg196087https://www.eevblog.com/forum/testgear/acdc-current-probe-for-scope/msg1223596/#msg1223596