MIL-STD-285 – Electromagnetic Shielding
MIL-STD-285 is a U.S. military standard that outlines methods for measuring the attenuation performance of electromagnetic shielding enclosures. It provides procedures for evaluating how well an enclosure blocks electromagnetic interference (EMI) across a frequency range of 100 kHz to 10 GHz.
Why is MIL-STD-285 Important?
- Ensures Equipment Protection – Verifies that enclosures effectively shield sensitive electronics from external EMI.
- Maintains Operational Integrity – Prevents systems from emitting or receiving disruptive electromagnetic signals.
- Provides Uniform Testing – Establishes standardized methods for assessing shielding effectiveness.
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Key Aspects of MIL-STD-285 Testing
- Attenuation Measurement – Tests how much electromagnetic energy is reduced by the shield, measured in decibels (dB).
- Test Setup – Involves placing signal sources and receivers on opposite sides of the shielded enclosure to assess EMI attenuation.
- Complete Configuration – Includes all power lines, signal cables, and utility entries during testing to reflect real-world performance.
- Frequency Range – Covers EMI testing from 100 kHz to 10 GHz, suitable for a wide range of electronic systems.
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