National Instruments NI-DAQ driver is provided for use solely with NI data acquisition boards. In order to use your board in LV, Keithley will need to provide a driver for the board. They may also provide a LabVIEW interface for the board. Otherwise, you will need to call the driver from within LabVIEW using the Call Library Function. NI-DAQ's LabVIEW interface does this to provide quick and easy integration into LabVIEW with NI's DAQ boards. However, it is up to the hardware manufacturer of your board to provide this interface.
Regards,
Erin