What is the MIL-STD-461?

rugged military environment where crystal group systems are in use

For the Department of Defense, specifying a computer’s electromagnetic interference (EMI) and its electromagnetic compatibility (EMC) is a vital indicator on how well the computer will operate within many “noisy” environments. MIL-STD-461 breaks down the EMI requirements for a wide range of applications, from trucks to ships to aircraft to fixed installations, as well as the various requirements within an application (e.g., above deck and below deck on a Navy ship). There is also an opportunity to tailor the requirements to particular applications. Although the most modest EMC requirements are not much different from commercial requirements, most applications are decidedly harsh.

Since the 1990s, the US DoD has encouraged the use of commercial off-the-shelf (COTS) components wherever possible. In certain situations though, military standards such as MIL-STD-461 must be enforced when the system needs to coexist with other equipment such as powerful transmitters and highly sensitive receivers. Oftentimes, commercial components and computers require upgrades or ruggedization to meet these rigorous military demands.

MIL-STD-461 Tests:

Conducted Emissions

  • CE101 – Power & Interconnecting Leads
  • CE102 – Power & Interconnecting Leads
  • CE103 – Antenna Terminals

Conducted Susceptibility

  • CS101 – Applicable to Power Input Leads that obtain power from other sources not part of the computer, including those that are rechargeable.
  • CS103 – Antenna Port, Intermodulation
  • CS104 – Antenna Port, Signal Rejection
  • CS105 – Antenna Port, Cross Modulation
  • CS109 – Structure Current
  • CS114 – Bulk Cable Injection
  • CS115 – Bulk Cable Injection, Impulse Excitation
  • CS116 – Damped Sinusoid Transients – I/O & Power Cables

Radiated Emissions

  • RE101 – Magnetic Field
  • RE102 – Electric Field
  • RE101 – Antenna Spurious & Harmonic Outputs

Radiated Susceptibility

  • RS101 – Magnetic Field
  • RS103 – Electric Field
  • RS105 – Electromagnetic Pulse Field Transient

If you have questions about Crystal Group’s MIL-STD-461 testing or our rugged product line, please contact us or call us at: 877.279.7863.