What is the Right Cable and Accessory for PXIe-4137 When It is Used in Smaller than 1mA Current Range?

Issue Details

I have a PXIe-4137 used in current range is smaller than 1mA, and I need to source and measure with nA resolution.

I check SA-413B specifications and see notice "The SA-413B is recommended for use with 1 mA and larger current ranges."

Then, what is the right cable and accessory for the more accurate test? 

Solution

Following this guide Cable and Accessory Compatibility.

From Cables and Accessories table, we recommend 130123-01/02 for the test current range is less than 1mA.

​Though 784068-01 is shipped along with PXIe-4137.

Also, wiring is very important too. If improper wiring techniques are used along with either of these accessories we can easily end up with performance that is no better than the SA-413B. The SA-413B has some performance limitations of it's own, but banana cables are also not generally conducive to making good low current level measurements. 

Refer to attached doc "USER GUIDE SH8M-7F-LL Low-Noise, Low-Leakage 8-Pos COMBICON to 7-Pos COMBICON Cable for SMUs.pdf"