LabAdviser/314/Microscopy 314-307/SEM/Nova/Micro 4-point probe: Difference between revisions
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The electrical resistivity of metallic bulk and thin-film samples is usually measured by the 4-point probe technique. The classic arrangement, visible in Fig. 1, consists of four needle-like electrodes in a linear arrangement, with a current injected into the material via the outer two electrodes, while the resulting difference in electric potential is measured via the two inner electrodes. | The electrical resistivity of metallic bulk and thin-film samples is usually measured by the 4-point probe technique. The classic arrangement, visible in Fig. 1, consists of four needle-like electrodes in a linear arrangement, with a current injected into the material via the outer two electrodes, while the resulting difference in electric potential is measured via the two inner electrodes. | ||
[[File:Picture2.png| | [[File:Picture2.png|400px|Figure 1. 4-point probe setup. The current is supplied by the outer connections, | ||
the voltage drop is measured between the inner connections.]] | the voltage drop is measured between the inner connections.]] | ||