One of those daft things you do when there's nothing on telly - measure a DVM using another DVM.
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Good morning all…
Youtuber, shed dweller, solar charge controller aficionado
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Wanna sell one of those? I can't find one anywhere and it takes the same battery as my scope so I'd rather keep on the same system when possible
OL on an ohmeter means open loop.
what is this madness
wear can i get one of ryobi Digital Multimeter
I.m.o. trying to measure the resistance isn't working because putting a voltage across the 2 leads is effectively causing the water to be split into hydrogen and oxygen, so the anode and cathode will have small gass bubbles forming reducing surface area, and thus increasing resistance, as well as the one lead becoming contaminated as it reacts to the oxygen. again increasing resistance.
basically what you see is polarization of the water molecules and
conductivity from the impurities in the water it's not capacitance it's the charges of the molecules aligning to the flow of the current I assume that if you leave that for a certain amount of time it will stop rising cause all the molecule will be aligned not too sure tho but that's what comes to mind…..
If you are using tap water, it will have impurities in the form of ions and this will allow a current to flow and electrons will travel from the -ve terminal to the +ve terminal. Please try the same experiment with pure water, there should be no current flow and you may get a result.
I was looking at getting one of those Ryobi multimeters, but it seems that they're not available in Australia. It's a bit of a shame, because they look like great multimeters.
Roby looks cool as always., but how are the measurements versus others like uni-t and fluke
(I know it's comparing Ferrari versus kia) but just want to know
Unless both meters have exactly the same electrical circuits (same revision numbers on the printed circuit board) and the components of both meters are from the same manufacturing lot numbers you are trying to compare apples to oranges. Do not even think about the possibilities of a single components in either of the meters being mis – labeled or out of spec.
The 2 rods and water may be behaving like a capacitor, where the rods are the 2 plates and the water since its tap water without salt is sort a dielectric.