I want to use a PXI-6733 to output voltages and then measure those voltages using a PXI-6289. In cofiguring the measurement on the PXI-6289, there are the choices of Referenced Single Ended, Non-Referenced Single Ended, and Differential. So is the analog output of the PXI-6733 considered floating or ground referenced? Which would be the best setting for the PXI-6289 analog input channel? Thanks.