Kelvin leads/shunts

[wptski]

I purchased a CSA100-100 current shunt resistor from RC-Electronics-USA. Nice, mounted set with four connections.

At their site they describe the shunts as having a Kelvin four wire connection to measure the voltage drop across the resistor. As far as I know Kelvin type four wire leads are used for checking very low resistance values as it eliminates the test lead resistance which is a problem with only two leads.

True, it does have four connections but a milliohm meter uses the Kelvin leads but has a constant voltage and current to calculate the resistance. Your using a fixed resistance but maybe not a constant voltage to calculate the current with the shunt.

If this is true than "any" shunt resistor would be considered a Kelvin four lead setup???

 

[HCaul]

I purchased a CSA100-100 current shunt resistor from RC-Electronics-USA. Nice, mounted set with four connections.

At their site they describe the shunts as having a Kelvin four wire connection to measure the voltage drop across the resistor. As far as I know Kelvin type four wire leads are used for checking very low resistance values as it eliminates the test lead resistance which is a problem with only two leads.

True, it does have four connections but a milliohm meter uses the Kelvin leads but has a constant voltage and current to calculate the resistance. Your using a fixed resistance but maybe not a constant voltage to calculate the current with the shunt.

If this is true than "any" shunt resistor would be considered a Kelvin four lead setup???

Right, any shunt resistor with two connections on each side (that meet some requirements for the resistance between them with respect to the shunt itself) will do as a Kelvin (4W) connection. You usually connect the power supply leads for the circuit under test to the bigger connectors and the sense leads to the smaller ones.

H. Caul

 

[wptski]

Right, any shunt resistor with two connections on each side (that meet some requirements for the resistance between them with respect to the shunt itself) will do as a Kelvin (4W) connection. You usually connect the power supply leads for the circuit under test to the bigger connectors and the sense leads to the smaller ones.

H. Caul

Ah! A reverse Kelvin?