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Small question about Voltmeter.

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alphacat

New Member
Hey,

I wanted to ask please, does a voltmeter know what is the + and what is the - of the DUT by sensing the direction of the current which flows through it when connected in parallel with the DUT?

Thanks.
 

crutschow

Well-Known Member
Most Helpful Member
It simply senses the polarity of the voltage, not the current. It likely senses whether the input is positive or negative with respect to the common lead with a comparator and adjusts the input polarity to the voltmeter circuit so it measures the voltage properly.
 

alphacat

New Member
Thanks.

Isnt the voltage polarity set by the current flow's direction?

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I mean, i thought that the only way to determine the voltage's polarity was to check the flow direction of the electrons.
 
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BrownOut

Banned
Thanks.

Isnt the voltage polarity set by the current flow's direction?

--
I mean, i thought that the only way to determine the voltage's polarity was to check the flow direction of the electrons.
On a microscopic level, that's true. However, we think of things like comparators and op-amps as voltage devices. It just makes analysis easier.
 
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