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| Good clamp meter for low DC currents |
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| wofritz:
--- Quote from: Martin72 on December 28, 2023, 08:33:12 pm ---I recently found a current clamp meter that has a dedicated mA range and is still cheap (under 100): <Peaktech 4350> --- End quote --- I have this one. It is working quite well even in the DC mA range. Problem is zeroing. Best results are obtained if you zero it in the circuit and don't change the setup after that. But that's not possible if you can not switch off the device under test, which might be the reason to use a clamp meter in the first place. |
| Hydron:
I think mA resolution and careful zeroing is about as good as you can do without going to heroic efforts to minimise the gaps in the magnetic circuit (as the multi-kilobuck tek/hikoi/clone probes do, to the extent of lapping the core interfaces and using thin film hall sensors and nulling coils). Even those ones are pushing it for use at sub-mA resolution. |
| HKJ:
I decided to check my Benning CM11 with a current source (Keithley 2460). Short-term it only changes about 0.1mA, i.e. measuring 0.5mA it changes between 0.5mA or 0.6mA, but boosting the current to 1A for a short time (Maybe 10sec) may add a offset of a few mA*, i.e. requiring a new ZERO to get the low current reading correct again. *This kind of offset is due to magnetizing the clamp, i.e. it will only occur first time or after a current direction reversal, I did play a bit with some clamp meters and magnetization here: https://lygte-info.dk/info/DMMClampDemag%20UK.html The CM11 is much better than the UT210e, but the Fluke is probably better in the lowest measurements. |
| HKJ:
--- Quote from: csuhi17 on December 29, 2023, 12:06:29 pm ---Which Fluke has better DC measurement parameters than the Benning CM 10-PV? for the same amount of money? https://www.benning.de/products-en/testing-measuring-and-safety-equipment/current-clamp-multimeter/pv-current-clamp-meter-cm-10-pv.html --- End quote --- The Fluke was mentioned earlier in the thread, it is a special purpose clamp meter, not a general purpose one and is probably much more expensive from new, but can be bought used. |
| csuhi17:
--- Quote from: HKJ on December 29, 2023, 12:09:32 pm --- --- Quote from: csuhi17 on December 29, 2023, 12:06:29 pm ---Which Fluke has better DC measurement parameters than the Benning CM 10-PV? for the same amount of money? https://www.benning.de/products-en/testing-measuring-and-safety-equipment/current-clamp-multimeter/pv-current-clamp-meter-cm-10-pv.html --- End quote --- The Fluke was mentioned earlier in the thread, it is a special purpose clamp meter, not a general purpose one and is probably much more expensive from new, but can be bought used. --- End quote --- I may have misinterpreted the description of the Benning that I linked to, which is why I deleted my previous question. If I managed to understand correctly, then a The uA measurement does not apply to the clamp meter... The clamp meter measures with a minimum scale of 10mA. |
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