CONSTRUCTION AND EVALUATION OF A PROTOTYPE ELECTROMAGNETICALLY SHIELDED ROOM.
Technical rept., Jul 64-Jan 65.
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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An electromagnetically shielded room composed of 20-gage sheet-metal wall material with continuously soldered seams was constructed and evaluated at the Naval Civil Engineering Laboratory. The 20 x 20 x 8-foot room is a prototype model designed as a basis for determining specifications for the construction of large shielded room installations. Electromagnetic shielding evaluation of the room was performed in accordance with MIL STD-285, along with additional measurements at 1.0, 2.5, and 9.0 Gcsec. The lowest value of shielding effectiveness was 65 decibels at 14 kcsec. Construction techniques for such design features as sheet-metal joints, soldered seams, power-line filtering, ventilation ducts, and cable raceways are discussed. Techniques for providing penetrations into the room for gas, water, and sewage were investigated. Measurements of the effect of small, controlled openings into the room were determined. The acoustic shielding properties of the room are also given in this report. Author
- Electrical and Electronic Equipment
- Structural Engineering and Building Technology