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I have down load 2400 keithley Labview Drive to LV library from Keithley website.Now how do i an vi that can set I(current)@ source and voltage at compliance

It's been a few years since I used the 2400 but my old driver had VIs called DCI Source Config and DCV Source Config. As I recall, the driver was fairly complete. All I can suggest is that you go through all of the VIs that you downloaded and review which ones will program the instrument the way you want. It may require you looking at the diagrams of each VI and seeing what commands are being sent.
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Just a note: some of the older Keithleys can not be set for measurement type (voltage or current) from remote. You can set scale and timing, but not type of measurement. I have not worked with the 2400, but hope you do not have that problem.
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Make sure you get the "advanced" set of drivers. The basic drivers had an error in the "one shot read" vi which reset the source meter before each measurement - effectively over-riding any setting you sent with the source and measure config vi's.

I was stuck on this for a while until I found the bug. Keithley updated the drivers a few months later.
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