Use time domain reflectometry (TDR) to compensate for skew that load boards or cables introduce.

To accurately measure and adjust propagation delay for channels that extends beyond the point where the system timing is externally calibrated, use the NI-Digital Pattern TDR API. You can also use the TDR functionality of the Digital Pattern Editor.

Run the TDR measurement after changing cabling, instrument connections, or load boards.

Note For TDR to operate properly, ensure that the DUT sockets for the specified channels are empty when running the TDR measurement to open or shorted to ground when running the TDR measurement to short. Also ensure that the cables and load board connected to the digital pattern instrument make a 50 Ω controlled impedance system.