Chapter 5 in the user manual for the NB-MIO-16 contains the
calibration procedure for this device. Below, I have included a link
to this manual:
<a
href="http://digital.ni.com/manuals.nsf/websearch/0BAB030CDC8F5B4686256727005504CC?OpenDocument&node=132100_US">NB-MIO-16
User Manual</a>
Good luck with your application.
Spencer S.