HSDIO - Hardware Configuration To Test Open-drain Bi-directional Signal?

Hello, We will be using a PXIe-6556 HSDIO card to test a DUT that contains open-drain bi-directional pins. The DUT bi-directional pins have about a 1K pull-up on them to Vdd (3.3V). What is the recommended and/or required hardware configuration to allow parametric (DC and timing) measurements testing on these pins. My main concern is with termination to maintain signal integrity and level measurements which may be affected negatively by the terminations. Another issue is that the 1K pull-up on the DUT end is going to be insufficient to drive the 50 ohm input of the 6556 to a valid logic level. Does anyone have any answers or links to other NI collateral that shows the best way to do this? Thanks, Steve