Pulse field (technology)

A Pulse Field 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.

When the player first gets to it, it's effectiveness is demonstrated by an American soldier running onto it, then he seemingly suffers a massive electrocution, collapses and evaporates just like people killed in the simulation, so it is probable that the field not only damages the armor, it kills the wearer as well.

A Chinese-controlled computer terminal reveals that the intelligence aquired by the Chinese regarding T-51b deployment was incorrect, as in the armor is being deployed ahead of schedule; for this exact reason, the sender of the decoded transmission heavily recommends the use of EM fields. Presumably the Chinese either knows the armor's schematics (and thus it's weaknesses) or they had previous experience regarding EM fields and an earlier Power Armor prototype.