If you're just looking to display a graph on the PC, a much faster solution is to use the trace capture function in Agilent's driver (ftp://ftp.agilent.com/pub/mpusup/vxipnp/winnt/supported/856xe.exe) to retrieve the trace and plot it in a LabVIEW graph. The communication time is faster, and the graph is nicer (and has many more options!).