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I want to measure the sheet resistance R_square on a printed product.

My measuring equipment consists a SMU to supply and measure and a four point Probe by Jandel.

As output size I get the electrical resistance R (basically the measured Voltage U divided by the supply current I)

So I have to multiply the geometric factor and a correction factor (correction factor because the width is small)

The derivation for the geometric factor I have found on :

http://www.four-point-probes.com/four-point-probe-...

And the correction factor table is shown here, in my case its on page 54

https://www.iiserkol.ac.in/~ph324/StudyMaterials/G...

Funny but true, I get twice the value than in the reference measurement system (eddy current technology)

So may we can discuss why?

And the bigger Question: why is the resistance calculated in the derivation with U/2I.

In my opinion there is no superposition of currents because they have a different sign.

Thank you in advance,

ScieneShines