The DT9837 is not directly supported in SignalExpress. It also does not appear to have IVI instrument support, so using the generic IVI acquisition steps will not work. You will need to write a user step in LabVIEW using the LV-Link software supplied by Data Translation to get this to work in SignalExpress. Use the supplied templates so you can get intialization and finalization of the instrument to work correctly. Let us know if you run into issues. My apologies for the lack of direct support.
Using LabVIEW 2009 - 2012 on Windows 7 64-bit