After importing the usd model, 1. Open the Articulation Inspector through Isaac Utils > Workflows > Articulation Inspector and press Play button
DOF Types [1,1,1,1, 1, 1, 1, 1, 1, 1, 1, 1]
Positions [nan, nan, nan,nan,nan,nan,nan, nan, nan, nan, nan, nan]
Velocities [nan,nan,nan,nan,nan,nan,nan, nan, nan, nan, nan, nan]
Efforts [nan,nan,nan,nan,nan,nan,nan,nan,nan, nan, nan, nan]
reference linking: 5.7. Adding a New Manipulator — Omniverse IsaacSim latest documentation