Hello,
after many hours of trial and error with the NI DCPower driver I finally manged to get the functionality I wanted:
With LabVIEW 2014 and the NI DCPower driver I am setting DC current steps in a sequence while measuring the exact current and voltage values set by the PXIe-4139 after each sequence step and fetching the values saved in the buffer (Measure When Property = Automatically after Source Complete).
My problem is that the communication or rather the sequence takes way too much time.
According to the specifications (http://www.ni.com/pdf/manuals/376115e.pdf, page 11/20) the maximum source update rate is 100k per second.
A sequence of 3000 points in my VI (see attachments) takes about 100 seconds.
I am aware that I can quicken the sequence without measuring and fetching the exact output (Measure When Property = On Demand) but then still the sequence takes about 50 seconds.
About 50 seconds for 3000 values means 60 values per second...so how do I tap into the missing 99940 values per second?
