EMP and HEMP Protection: Why Critical Facilities Need It
How strong electromagnetic pulses affect electronic systems and how critical facilities are protected.
3 min readAugust 5, 2026
What Does the Standard Require?
MIL-STD-461 defines test methods and limits for the interference military equipment emits and its immunity to outside signals.
Tests are carried out in an absorber-lined shielded chamber with a specific test table layout.
Chamber Size and Absorbers
Chamber size is set by the largest equipment to be tested, antenna distances and the table layout. Absorbers are chosen to reduce reflections enough at the frequencies the standard requires.
Floor reinforcement and wide doors should be planned for heavy equipment.
Shared Use with DO-160
The RTCA DO-160 tests used for aerospace equipment can often be run in the same chamber.
A design that covers both standards increases the return on the investment.
Test Details
Chamber design depends directly on which MIL-STD-461 tests will be run. We explained the setup and requirements of the most requested tests, such as CE102, RE102 and RS103, in our MIL-STD-461G tests article.
For platform-level compatibility, MIL-STD-464 comes into play. For chamber options, see our MIL-STD-461 test chamber page.
Frequently Asked Questions
How long does it take to build a MIL-STD-461 chamber?
It depends on size; a detailed schedule is given after the survey.
Do you also supply test equipment?
We design the chamber around your equipment list; equipment supply can be planned together depending on project scope.
Can the chamber be enlarged later?
Thanks to the modular design, expansion can be planned; absorbers and turntable should be chosen with that in mind.
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