Does this even make sense? Measuring voltage of a capacitor

[flyingpig]

But I thought voltage doesn't "move"

 

[berkeman]

But I thought voltage doesn't "move"

Voltage does not move per se. I'm not sure I'm understanding your perspective here.

The external large capacitor has a charge on it, related to the capacitance and the voltage. When you connect the voltmeter's initially uncharged leads to the capacitor, a small current flows in the leads to charge up the input capacitance of the MOSFET preamp in the FET VOM. That puts (almost) the same voltage on the VOM input as was on the capacitor to start with. Very little current flows for the rest of the measurement (only MOSFET gate leakage current). When you disconnect the VOM leads from the external capacitor, they are initially charged up still to that same voltage, but the voltage droops to zero fairly quickly (based on the leakage current and input capacitance).

 

[flyingpig]

Can you not use acronyms...? I hardly know what those technical words mean.

 

[berkeman]

Can you not use acronyms...? I hardly know what those technical words mean.

So you didn't actually read the wikipedia page that I linked for you a few pages back then...

 

[flyingpig]

No I know what a multimeter is, we have one of those.

 

[berkeman]

No I know what a multimeter is, we have one of those.

So what acronym is not defined for you?

 

[flyingpig]

Mosfet, vom, fet

 

[berkeman]

Mosfet, vom, fet

Re-read the wikipedia article please. Thank you.