IPC-TM-650 EN 2022 试验方法1.pdf - 第594页

Figure 1 Shielding Effectiveness T est Setup IPC-TM-650 Number Subject Date Revision Page 4 of 5

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Table 1
Metal
Relative
Conductivity
G
Relative
Permeability
u
Properties
of Various Metals
at 150 KHz
Properties of Various Metals
at 400 MHz
Absorption
Loss in db
A
Magnetic
Reflection
Loss in db
R
Electric
Reflection
Loss in db
R
Absorption
Loss in db
A
Magnetic
Reflection
Loss in db
R
Electric
Reflection
Loss in db
R
Silver 1.05 1 1.34 34.7 198.5 6.92 48.9 155.7
Copper 1.00 1 1.31 34.5 198.3 6.76 48.7 155.5
Gold 0.70 1 1.09 32.9 196.7 5.65 47.1 154.0
Aluminum 0.61 1 1.02 32.4 196.1 5.28 46.6 153.4
Magnesium 0.38 1 0.80 30.3 194.1 4.17 44.5 151.3
Cadmium 0.23 1 0.63 28.1 191.9 3.24 42.3 149.1
Nickel 0.20 1 0.58 27.5 191.3 3.02 41.7 148.5
Iron 0.17 1,000 17.06 1.07 160.6 88.14 11.8 117.8
Tin 0.15 1 0.50 26.3 190.0 2.62 40.5 147.3
Steel, 1045 0.10 1,000 13.10 0.0001 158.3 67.6 9.8 115.5
Lead 0.08 1 0.37 23.6 187.3 1.91 37.7 144.5
Mu-Metal 0.03 80,000 64.13
7.3 134.0 331.17 0.93 91.2
Permalloy 0.03 80,000 64.13
7.3 134.0 331.17 0.93 91.2
Stainless
Steel
0.02 1,000 5.85 -1.3 151.3 30.23 4.2 108.5
Valid only if incident field does not saturate metal.
Calculations are for a 0.0025 mm thick shield 2.5 cm away from the radiating source.
IPC-TM-650
Number
Subject Date
Revision
Page 3 of 5
Figure 1 Shielding Effectiveness Test Setup
IPC-TM-650
Number
Subject Date
Revision
Page 4 of 5
Figure
2 Connection of Copper Wire
IPC-TM-650
Number
Subject Date
Revision
Page 5 of 5