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I am using Keithley SCS 4200 for basic electrical measurement like I-V, C-V, resistivity measurement etc. My SCS 4200 is having only 2 SMU ( 1 medium power and other with pre amp). The preinstalled resistivity measurement test requires atleast 3 SMU's but i have only two.
I want to know how to do resistivity measurement in four probe configuration manually. My work is on GaN epitaxial films. I have made four ohmic contacts on them. I want to one One SMU for source and other for sense. Infact 1 SMU can be used for both sense and source but i dont know how. I can do switching manually.
Please guide me
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