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| Would you buy a precision µ/mOhm DMM adapter? |
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| thm_w:
--- Quote from: kripton2035 on March 12, 2023, 03:05:51 pm ---this easy to make device finds shorts quickly. it injects only 30-40mA in the probes. http://kripton2035.free.fr/Projects/shorty-display.html --- End quote --- I would consider buying a dedicated device like this. If I want to measure low resistance with the DMM then I'll attach a power supply to the short. But that requires messing with two devices, or in your case DMM and adapter. Having it all in one might be nice. Also the probes may be specific to low ohm measurements. One or two 18650's would be capable of 1A easily. I'm not sure how long a single AA would last unless you are pulsing the current in short bursts. |
| MathWizard:
I have kelvin probes for my cheap LCR meter, that would do better at DCR than my DMM's from my early days. Now I have 2 DMMs with 4wire mode. What about low voltage amplifiers probes for a scope ? Are there are ones under a few hundred $'s that are any good ? That would be a fun thing to try and copy old models of. |
| magic:
I use a 100mA current source and ordinary DMM in mV range. Goes down to 1mΩ resolution with 3.5 digits or better with newer DMMs. Measurements are inherently 4-wire. Found it useful for testing things like connectors, cables or jumpers. |
| kripton2035:
you need 0.1mΩ resolution to precisely track down a short on a pcb. |
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