I've been using the PXIe 4140 to measure Current/Voltage curves for transistors --- it sets a voltage & I read out current (not necessarily on the same channel). But I'm noticing a peculiarity in the data depending on the current limit. Firstly, I get different results if I let the device autorange versus manually setting the current limit. Particulary, there is an current offset which occurs for differnent current limits. In the attached file the current is allowed to autorange for the red data, and set at 100mA for the blue data. [the axes are drain source current - IDS -- & gate Source Voltage - VGS] Any idea what's causing the .02mA offset in the red data?

Thanks for following up with an explanation. It looks like this resource addresses your question: http://digital.ni.com/public.nsf/allkb/EE869FC813944EAC862578F0005519F5

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