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| Hantek CC-65 AC/DC Current Probe Teardown and Testing |
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| Mechatrommer:
quick and simple current measurement setup... * poorman's FG 5.88Vpp sine wave into 52.88ohm (measured with DMM) load/termination * dso channel 1 (yellow) is reading volt across load resistor. * cc-65 probe setting at 1mV/10mA, plugged into channel 2 (blue) of dso. * dso acquisition is averaged 8 * theoritically the reading should be (5.88Vpp/52.88ohm = 111mA, ie 11.1mVpp reading at channel 2) * theoritical -3dB reading is @ 11.1mVpp / 1.414 = 7.86mVpp result: reading floor at 5mA (500uVpp), ie no current/wire pass inside hall sensor (refer to 4KHz open.png) -3dB BW is excess of 23KHz, hence the claim in the spec (20KHz BW) is valid. (refer to 23KHz test 52.88ohm.png) teardown pictures as attached... http://www.dx.com/p/hantek-cc-65-ac-dc-current-clamp-meter-multimeter-with-bnc-connector-blue-black-197938#.VG4o3sZNJ8E (edit 240411) some useful posts (imho) to consider modding your probe: (please inform me if i miss other useful info) ymmv 1) mickab: https://www.eevblog.com/forum/testgear/hantek-cc-65-acdc-current-probe-teardown-and-testing/msg3320244/#msg3320244 2) toli: https://www.eevblog.com/forum/testgear/hantek-cc-65-acdc-current-probe-teardown-and-testing/msg3625496/#msg3625496 |
| bdivi:
Hello Mechatrommer, Thank you for the mini review. This Hantek clamp is one of the very few affordable DC milliamp clamps on the market and I bought myself one a couple of months ago. I was however disappointed with the performance. As you noted AC is good to above 20KHz (I measured 28KHz -3dB). The clamp DC nulling on the other hand is hopeless - I have to press the button numerous times in order to get it close to 0 and after that it drifts all over :bullshit:. It goes +/- 50mA in several minutes and on top of that it measures 5-6% above the actual value. I was in contact with Hantek support asking them for calibration/repair manual and schematic but could not get anything so far. I am sure that if we get hold of the schematics we will be able to improve the performance - it is amazing how they managed to put so many low quality trimpots in this package. Cheers bdivi |
| R_G_B_:
Best way to test this is to use a square wave. I think it works up to around 2khz square wave. Then it gets out of shape and distorts the amutude and phase response. R_G_B |
| Lightages:
I also have one of these and have been meaning to do a review of it too. Other things have gotten in the way. I also am not very impressed with the performance. I hold zero hope of getting any kind of help from Hantek, but you never know. |
| IDEngineer:
Just picked up a Hantek CC-65 current probe. I'm working on some motor sensing circuitry and have a precise onboard current sensing circuit. I clamped the CC-65 around one of the motor leads and connected it to my scope's CH4. The onboard circuit is connected to my scope's CH1. I've attached a screenshot of the two traces, offset a bit for comparison. (CH1's cutoff on the first peak is due to saturation - the motor was drawing more current than the circuit could report. It was within the CC-65's range, though, so its output isn't truncated.) I'd say, for the money, the CC-65 does a pretty good job of tracking what the onboard circuit reports. Would I like to have a nice Tek current probe with its standalone amplifier? Sure! But for many applications I think the CC-65 is a heck of a deal. |
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