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Hantek CC-65 AC/DC Current Probe Teardown and Testing

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mrprecision:
Hantek Current Probe Frequency Response:

jrf:
Thanks for the Schematic.
I have been looking at options for a clamp & all the cheap ones look to use almost the same circuit, with the same issues, so I wanted one with a circuit I could modify &/or repair.
To this end I hunted for info & from partial schematics, photos, & descriptions I have prepared the attached schematic with notes.

This is not 100% accurate.

I have ordered a clamp but it is still 4-6 weeks away.
If anyone has any suggestions or corrections please help!

Cheers,
John.

jrf:
Did not see my attachment in last post so will try it this way.

 cc-65-CLAMP.pdf (21.08 kB - downloaded 811 times.)

Cheers,
John.

belzrebuth:
Isn't this able to perform better with some circuit change or something or it's at the limit of the topology used?
I'm slightly surprised this hasn't be done yet, given how many people have it and its target price.

I mean even exchanging some parts for more expensive ones should still render this tool a great value for hobbyists.
Since it's analog there shouldn't be much in terms of tedious reversing and they must be some known good designs that the hantek could be adapted to.
I know what I say is vague and I admit I don't know much if anything about current probes but I'd expect this would be a nice hacking candidate for knowledgeable people.

jrf:
If you look at CC-65-clamp.pdf, available above, you could try replicating part of the circuit U3-1&2 & U4-1 on a breadboard. Feed it power & signal from the clamp. By changing U3 & U4 to amps with 10x the bandwidth you may be able to determine the upper limit of the Hall sensors. I have seen others reach 100KHz with similar sensors. BUT to go further best use an AC clamp. With modern cro's just adding the output from AC & Hantek would give the complete picture. This is the approach used in early model AC/DC MHz range probes. Not sure what is used now.  Remember the material used for the core of the clamp will also affect its response. AC ones are likely to start at 20KHz but go to a GigHz if you spend enough! & thats the point. If you spend a lot of time & energy you may be able to push this to 100KHz but it will use more battery power & it all depends on how much more usefull that is! Also  other clamps like this from PICO etc are using basically the same circuit. It is probably an obsolete design from the 80's just using more modern  components built on price/performance compromise.

Also note the capacitors are just a guess. I actually suspect the small ones to be closer to 0.01uF rather than 0.1uF but as I am still waiting on my clamp from AliEXPRESS or Ali-snailmail (7 weeks & yet to leave China!- & can't complain till 100 days!) I can not measure them or some other parts of the circuit to confirm accuracy.

Good luck,
john

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