What Is MIL-STD-464?

MIL-STD-464 defines electromagnetic environmental effects (E3) requirements at the level of a complete system or platform, such as an aircraft, ship, ground vehicle, missile or space system, rather than a single box. Where MIL-STD-461 qualifies a piece of equipment, MIL-STD-464 makes sure all the equipment, antennas, cabling and structure coexist and survive the wider electromagnetic environment.

E3 is the umbrella term for everything electromagnetic that can affect a platform: interference between its own systems, radio and radar fields from outside, lightning, electromagnetic pulse, static electricity and the effect of RF fields on people, fuel and ordnance. MIL-STD-464 sets a requirement for each, together with how it should be verified.

The standard has been revised several times. MIL-STD-464C (2010) was in use for a decade, and MIL-STD-464D followed in 2020. As with 461, the contract names the revision.

The requirements are grouped by threat. The main ones are:

The two standards work as a pair. 464 sets the platform requirement, and 461 is the usual way to show each piece of equipment is fit to be installed. The table shows how they divide the work.

MIL-STD-464 refers to MIL-STD-461 for equipment-level interference control, so a supplier’s 461 results feed directly into the platform case. Our guide to MIL-STD-461 explains those equipment tests in detail.

MIL-STD-464 is verified with a mix of analysis, modelling, inspection and test, chosen requirement by requirement. Early in a programme, the integrator produces an E3 control plan that sets out how each requirement will be met and which evidence will prove it. Equipment is selected against MIL-STD-461 limits tailored for the platform, and the installation is designed for bonding, cable routing and separation between sensitive and noisy systems.

Once the platform is built, system-level tests check intra-system compatibility with every system switched on, measure the shielding the structure provides, and expose the platform to RF fields or simulated lightning where required. Margins are shown by testing at levels above the expected threat or by analysis. Records from each stage form the E3 verification report that the procuring authority reviews before the platform enters service.

Changes later in the platform’s life, such as fitting a new radio or replacing a computer, are assessed against the same requirements, which is one reason integrators prefer replacement equipment with the same or better 461 data.

Equipment suppliers rarely test to MIL-STD-464 themselves, because it applies to the platform. They feel its effects through the requirements it passes down. A prime contractor working to 464 will ask for MIL-STD-461 data on every box, for lightning-transient tolerance on cables that run outside the hull, for bonding points on the chassis, and sometimes for TEMPEST or emission control behaviour.

For a computer being integrated into a platform, that means a metal chassis with a defined bonding point, filtered power and I/O, shielded connectors, and a test report the integrator can reference. Our overview of US military standards shows how 464 fits alongside 461, 810 and the power standards.

Computers built for defence platforms are designed with the platform case in mind. Systems in our military computers and rugged mission computers ranges typically list MIL-STD-461 test results and military power-input standards, which give the integrator the equipment-level evidence a MIL-STD-464 programme needs. The integrator then demonstrates platform-level compliance once the system is installed and bonded. Supplying the bonding details, cable shielding and connector types early in the design helps the integrator plan that work.

We supply military and mission computers with the manufacturer’s MIL-STD-461 and power test evidence, and integrate and test each system before it ships. Tell us the platform and the requirements your integrator passes down, and we will shortlist systems to suit.