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 MIL-HDBK-419A
Table 8-19 (Continued)
Magnetic
Shielding
Effectiveness
Room Description
(dB)
(kHz)
MAX
MIN
111
50
15
Similar to above in construction features.
100
99
81
Double shielding of 10 gauge continuously inert-gas
25
0.1
62
52
welded low carbon sheet steel, 2" spacing between
1
108
92
walls, pneumatic bladder, expanding panel sliding
15
doors (no gasket).
120
100
107
Room partitioned into three separate rooms; two
104
73
0.5
are 12' x 12' x 10' and the third is 12' x 12' x 14'.
1.0
122
All seams continuously inert-gas welded 16 gauge
5.0
80
sheet steel. Doors have pneumatic bladder with
10
39
triple row of finger stock.
15
20
Room divided into three cells. Single shielding
1
115
sheet steel continuously inert-gas welded, with
15
114
104
pneumatic bladder, and expanding panel sliding
140
114
100
doors (EMI gasket for contact surface). Total
119
61
10,000
room size 30 x 70 x 12 feet.
8-68
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