What is kelvin point in circuit?

[OverMyHead]

Could someone please help to explain what is kelvin point? Is it just a specific connection point(intersection of measurement path and regular path) in the circuit?

Thanks!

[TimFox]

I've never heard of a Kelvin point, myself.  Do you mean a Kelvin connection?  That involves four wires and can be found by Googling.

[magic]

Is it just a specific connection point(intersection of measurement path and regular path) in the circuit?

Most likely this was meant.

[CatalinaWOW]

There are probably several buried meanings in the phrase, all tied back to Kelvin connections as mentioned in the previous post.

Some point in the circuit, often the input to an OP amp or other high gain component needs to act on a voltage that is not affected by real world factors such as trace resistance or other currents which may use some part of the same trace.  A stub trace from that point goes off to the sensing point (and possibly also a test point).  Everything which is connected to the stub has high impedance so negligible current flows in the stub and as a result the voltage is the same at any point on the stub line. (In the static or non-time varying case).

The only sure way to know what was meant is to ask the author.

[OverMyHead]

There are probably several buried meanings in the phrase, all tied back to Kelvin connections as mentioned in the previous post.

Some point in the circuit, often the input to an OP amp or other high gain component needs to act on a voltage that is not affected by real world factors such as trace resistance or other currents which may use some part of the same trace.  A stub trace from that point goes off to the sensing point (and possibly also a test point).  Everything which is connected to the stub has high impedance so negligible current flows in the stub and as a result the voltage is the same at any point on the stub line. (In the static or non-time varying case).

The only sure way to know what was meant is to ask the author.

Thanks for the explanation! I think this is what is means.