Greetings,
The NI 6713 can not internally measure the digital and/or analog output currents. Check out the link below for which NI products can be used to take current measurements.
Can I do Current Measurements with NI Products? Which Ones? How?
http://digital.ni.com/public.nsf/websearch/29534F94B158054486256B490059E3AD?OpenDocument
Regards,
Todd D.
NI Applications Engineer