Pulse field (technology)

A  is an electromagnetic pulse grid which paralyses the circuits of every device crossing it, including T-51b Power Armors. It appears in Fallout 3's Operation: Anchorage DLC, inside the Anchorage Reclamation simulation.

According to Lieutenant Morgan, the Chinese use such a field to protect their base of operations in the quest Anchorage. It has to be disabled by the player so American T-51b units can advance to the Chinese command post.