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==Four-Point Probe==
==Four-Point Probe==


[[Image:Probe_diagram.PNG|thumb|200x200px|Probe diagram (from https://www.ossila.com/pages/sheet-resistance-theory)]]The set-up of the four point probe is four the tungsten carbide electrodes/probes.The power source (DC) sends a current through the two outer electrodes. A digital voltage meter (DVM) measures the potential drop between the two inner electrodes.
[[Image:Probe_diagram.PNG|thumb|200x200px|Probe diagram. ''Drawing from https://www.ossila.com/pages/sheet-resistance-theory'']]The set-up of the four point probe is four the tungsten carbide electrodes/probes.The power source (DC) sends a current through the two outer electrodes. A digital voltage meter (DVM) measures the potential drop between the two inner electrodes.


The sheet resistance can then be calculated using the equation below:
The sheet resistance can then be calculated using the equation below:
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