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Hantek CC-65 AC/DC Current Probe Teardown and Testing
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jrf:
Well did some testing today. Very interesting. Much better results on the scope than on the multimeter.
My CC-65 does not seem to suffer the issues others have experienced. ie Zero error is minimal & as such drifts slowly.
It is important not to move the clamp afer zeroing!
Also there is no need for extra capacitors on mine. Noise level changes little when power is applied to meter.

I logged some results using Sign waves & square from 1KHz to 50KHz using about +/- 100mA.

10mA was the smallest current waveform that showed up on the scope. As such I am very happy.

Cheers,
John
Martin72:
This is what I would expect from a clamp, only showing it´s limited bandwith and not such a crap like the cp-05 does:

https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/msg3125996/#msg3125996

There must be something going in resonance or whatever.
Nevertheless, the hantek beats it for more than half of the price.
jrf:
Martin72,
I have seen similar, just can't remember when/why. Will ask around. It rings bells! That certainly looks to come from a filter. Quite a high Q in your frequency annalysis. May give good single frequency sine wave responce but hopeless for square waves!!.
Possibly an active filter & would certainly not help the noise responce of the clamp. ie ampifying it! In reality, when you look at the phase lag of CP05 & CC-65 with the CC-65 90' at about 40-50KHz compared to 25KHz for CP-05.
I believe my CC-65 uses the output coax as part of the filter circuit. Filtering out much of the HF noise present when looking at the meter signals directly with a 10x probe.
Also I failed to mention the Scope I used for the pictures was a LOTO-OSC482M. This USB unit works with a PC & Android. $120AU.
And the RMS current readings from the scope agreed with my 4 digit RMS meter within unit accuracy. Impressed. So my earlier comments about AC readings with a meter do not apply when using a osc.

So Conclusion:
Pros:
My CC-65 works up to 10KHz with a bandwidth of about 45KHz.
Its zero is stable & gives accurate readings from 30-50ma & up.
Noise is within acceptable limits. Only slightly higher than background.
Cheapest low current OSC clamp I could find at $72AU.
Does the job it was designed for as advertised.

Cons:
High DC currents will magnetise the head, resulting in a large zero offset. (but still read that current correctly!)
This can be reversed by reversing the current through the clamp or using a large AC current. ie I was testing at 60A AC & DC & zero moved ~20mv on 1mv/100mA scale.
Leaving the clamp for a few hours should give a zero offset with discharged capacitor. If > 5mv or so then the head is possibly still magnetised,picking up stray fields in close metal or the meter was poorly zeroed inititally.
The meter picks up magnetic fields & should not be moved once zeroed prior to taking measurements.
Need to hold the zero button for several seconds, 5-10, to stabilise the capacitor charge.

Conclusion: Worth the money if it meets your spec.

Happy,
John.
Martin72:
On the first (defective) one I began to desolder all the components for having a free look to the printed circuit, therefore I´ve measured most of the caps.


--- Quote ---It makes me wonder if there is not a fault with your clamp.
--- End quote ---

Yes, this is my opinion too - When I got time to investigate, I´ll do it in the "right" thread then.

Martin
Martin72:
Transport it to the CP-05 thread:

https://www.eevblog.com/forum/testgear/pintek-pa622-current-probe-crap-or-just-cheap/msg3128474/#msg3128474
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