Products > Test Equipment

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

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Martin72:
If it´s so, congrats to hantek. ;)

Here a comparison between much more expensive models like lecroy and tektronix, they´re "of course" better but not far away:

Elasia:
Case of you get what you pay for.. mine is the noisy cricket lol.. have to use a large averager but that improved greatly after i slapped some chip caps on the output, still picks up on a lot of hfq noise but not as bad filtering it out

Mine also loves to drift off into space constantly, i'll slap a constant voltage via a trim pot voltage divider + fixed resistor next time i tinker with it

jrf:
Thanks for those comparisons.  The best shot showing relative noise I could come up was from my Tektronix with Ch2 shorted & CH1 CC-65.

I have scaled both inputs to 5mV/div=50mA/div as per yours.
It puts into perspective my relative view. ie noise not an issue given my equipment. My USB scope shows less!
I have not 'zeroed' the clamp. Just switched it on, after powered off 24hr, & the recorded result.
No complaints.

Anyone with feedback on external fields/magnetic etc on other clamps? or magnetisation when using DC?

This seems to be the worst feature of a clamp to be used on cars, DC, or switched DC currents only!

Cheers,
John.

Circlotron:
I bought mine to look at the primary current in car ignition coils. Typically (some exceptions) not much more than 10 amps, often lower. In that application the DC current goes to zero every switching cycle so you only have to adjust the scope so the zero line corresponds to a horizontal graticule line and you're done. Accuracy, drift, noise and frequency response is quite good enough for this, so in this instance it is fit for purpose and I am quite happy with it. I can understand why others may not be completely satisfied though.

dcac:
I tried a spice simulation on the frequency response of the 272 op-amps. I guessed C6 to 1nF as this was the only value that gave a somewhat reasonable response in high gain mode:

EDIT: please disregard these traces - see next post.





But in low gain mode the response perhaps starts to drop of too quickly:



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