MIL-STD-461 RS105

RS105, defined in MIL-STD-461, tests the ability of electronic equipment or subsystems to withstand high-intensity, fast-rising electromagnetic pulses—often representative of a nuclear electromagnetic pulse (NEMP) or other transient, high-energy events. This test applies primarily to equipment intended for use outside shielded or hardened facilities where large, fast-changing fields can be a threat to mission-critical systems.

During an RS105 test, a double-exponential pulse with a rapid rise time—often on the order of nanoseconds—is generated at field levels that can reach up to 50 kV/m (–0 dB, +6 dB). The Equipment Under Test (EUT) is exposed to these pulses repeatedly, typically five or more times, at different orientations or positions to ensure comprehensive coverage. Specialized test equipment creates these powerful fields under controlled conditions, usually in shielded enclosures designed to protect the outside environment and ensure repeatable results.

Throughout testing, the EUT is continuously monitored for operational performance, looking for any signs of malfunction, data loss, resets, or permanent damage. Passing the RS105 test indicates that the equipment retains full functionality and meets performance criteria under extreme electromagnetic conditions. Consequently, RS105 compliance is critical for defense, aerospace, and other high-reliability applications that require robust protection from intense radiated transient events.