I was looking at the PXIe-4139 when the 4138 caught my eye. The only differences that I can tell is the 4139 can output 10A vs 3A for the 4138, and the 4139 has an order of magnitude better current sensitivity (100fA vs 1pA).
It looks like the sample rate and everything else is the same. Are there any other differences that I'm missing?
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