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I am trying to make a 4-point contact resistance measurement on a nanowire using the 6221 current source and the nanovoltmeter 2182a. I contact first the current source without any problem - the device blinks when the contact tips are in the air and as soon as they land on the sample it stops blinking. However, when making contact with the voltage-measuring tips, the nanowire burns and the current source starts blinking again. I believe it is a ground loop problem. The substrate of the sample is insulating. What would be the 6221's triax inner shield configuration that I need to use? Both hardwares are connected to the same electrical ground of the laboratory through the ground pin of the power cable.
Thanks in advance for any help.
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