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SMU Guarding

Hi All,

 

I'm looking to perform some low current measurements on my DUT and therefore am looking at including the Guard wires on my DUT evaluation PCB. I have two related questions on this issue.

 

1: The pinout of my 4141 says that there are two guard pins and I have verifed this with a DMM, they are connected together and drive at the same level as the Channel HI. However the recommended cable DB25F-DB25F Low leakage cable only has one of these guard pins connected through. Is this correct or is there an error with my cable? I have checked all 4 channels and they are the same.

 

2: Does anyone know of any good information / best practices for the guard tracking on my PCB?

 

Thanks all,

 

Nick

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Question now moved to a more appropriate board:-

 

http://forums.ni.com/t5/Digital-Multimeters-DMMs-and/SMU-Guard-connections/td-p/3179600

 

Nick

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