NISAR's flight antenna system undergoes thermal vacuum testing at NASA's Jet Propulsion Laboratory.

This close-up view shows NISAR’s flight antenna system before testing inside a thermal vacuum chamber at NASA’s Jet Propulsion Laboratory in Southern California. Thermal vacuum testing is conducted with the spacecraft antenna system in its stowed configuration, exposing it to the full range of temperatures it will see in orbit prior to deployment. The testing included functional checks of deployment motors and release of some launch restraints.