session based daq interface+usb-6218 shows drift
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i'm using matlab 2011b together with the daq toolbox (session-based interface) and a NI 6218 usb-daq to acquire data from a six axis load cell.
all channels seem to work properly according to measurement and automatation. also i have used the same setup and code successfully with a pci-6225.
the measurement shows a strange drift (without applying any load) when measuring (compare figure: http://imageshack.us/photo/my-images/196/problemsdaq.jpg/). though they react on applied load. is there anything i need to change or some other known issues with the usb-6218?
thank you,
richard
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Walter Roberson
2012년 5월 30일
There was a question some months ago about drift when using the legacy interface; http://www.mathworks.com/matlabcentral/answers/24758-drift-in-data-acquisition-toolbox-legacy-interface
There was also a question about drift when using multiple clocks in a session-based interface: http://www.mathworks.com/matlabcentral/answers/24757-daq-session-based-input-is-it-possible-to-have-different-clocks-for-input-and-output
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Tobias
2012년 8월 13일
Hi,
should the device work in single ended mode or in the differential mode? You need to determine that in your code. This could cause drifts.
Best Regards Tobi
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