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| Hantek CC-65 AC/DC Current Probe Teardown and Testing |
| << < (3/33) > >> |
| rpress:
The zero button is actually charging a cap up while it's pressed. So try holding it down longer. |
| mkee:
Of course...just realized that too...my mistake for not looking just a little closer before making that comment :P |
| mkee:
Just thought I'd mention an observation in case someone is looking for a comparison in the future. Or if someone is trying to improve this. Seems like the drift stabilizes at around -800mA (relative to calibrated state) on high sensitivity (1mV/10mA), and -550mA on the lower sensitivity (1mV/100mA). At least noise is much improved after modification though. |
| enyone:
Has anyone else noticed this behaviour of Hantek's CC-65 dc offset "walk" (see attached graph) ? There is some intervals where strange things happen and between those intervals measured values are quite static. I was wondering if it was my scope's ADC causing this but then I repeat same measurements at my multimeter and similar behaviour occured. Test setup is one 10 watt 12 volt automotive light bulb connected to full 17Ah 12 volt gel lead acid battery (attached photo has 2 similar of them but only the one behind the the on in front is used). Plot data collected with Rigol DS1054Z which was self calibrated before measurement. Lamp was powered cold when measurement started. Hantek's clamp was "nulled" to 0 DC offset when measurement started. |
| nctnico:
I see the same effect with a DC clamp from another brand. I think this has to do with the leakage of the capacitor + surrounding circuit that is charged during DC offset nulling. In other words: it is not suitable for doing long term measurements. |
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