How to Plan a MIL-STD-461 Test Chamber
Planning the chamber size, absorber selection and test setup for the mandatory EMC tests of military and aerospace equipment.
3 min readAugust 19, 2026
Physical Leakage
Cyber security is usually provided by software. But servers and cables emit electromagnetic signals while running, and these signals can be picked up from outside with suitable equipment.
In facilities that process classified data, shielding eliminates this risk.
Cooling and Cabling
In shielded data rooms, air passes through honeycomb filters, data runs over fiber optics and power lines go through filters.
Cooling capacity is planned accordingly at the design stage.
New Build or Conversion?
The best results come at the new-build or major renovation stage. Partial solutions can be applied in existing data rooms.
The right approach is decided during the site survey.
A Layered Security Approach
In a data center, shielding isn't a measure on its own but one layer of an electromagnetic security approach. Protection against leakage, intentional interference and pulses needs planning together.
We explained this layered approach in detail in our EMSEC in data centers article. For implementation options, see our data centers page.
Frequently Asked Questions
Should the whole data center be shielded?
Usually not; sections processing classified data or critical systems are enclosed in a separate shielded room or cabinet.
Does shielding make server maintenance harder?
With properly planned access and cabling, maintenance is done normally.
When is a shielded cabinet enough?
It's an economical single-rack solution for a small number of critical servers.
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