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儀器技術文章 |
功率中dB（分貝）與Watts的換算關系
來源：東方嘉儀 m.enraytech.cn 點擊：
功率中dB（分貝）與Watts的換算關系
X(dB)=10lg[Y(mW)]
|
以Watts計算dB
|
以dB計算Watts
|
|
dB
|
Watts
|
|
dB
|
Watts
|
|
dB
|
Watts
|
|
dB
|
Watts
|
|
|
0
|
1
|
mW
|
25.99883
|
398
|
mW
|
0
|
1
|
mW
|
26
|
398.1072
|
mW
|
|
2.0412
|
1.6
|
mW
|
27.99341
|
630
|
mW
|
2
|
1.584893
|
mW
|
28
|
630.9573
|
mW
|
|
3.9794
|
2.5
|
mW
|
30
|
1
|
W
|
4
|
2.511886
|
mW
|
30
|
1
|
W
|
|
6.0206
|
4
|
mW
|
32.00029
|
1.585
|
W
|
6
|
3.981072
|
mW
|
32
|
1.584893
|
W
|
|
7.993405
|
6.3
|
mW
|
34.0002
|
2.512
|
W
|
8
|
6.309573
|
mW
|
34
|
2.511886
|
W
|
|
10
|
10
|
mW
|
36.0206
|
4
|
W
|
10
|
10
|
mW
|
36
|
3.981072
|
W
|
|
12.0412
|
16
|
mW
|
37.78151
|
6
|
W
|
12
|
15.84893
|
mW
|
38
|
6.309573
|
W
|
|
13.9794
|
25
|
mW
|
40
|
10
|
W
|
14
|
25.11886
|
mW
|
40
|
10
|
W
|
|
16.0206
|
40
|
mW
|
42.0412
|
16
|
W
|
16
|
39.81072
|
mW
|
42
|
15.84893
|
W
|
|
17.99341
|
63
|
mW
|
43.9794
|
25
|
W
|
18
|
63.09573
|
mW
|
44
|
25.11886
|
W
|
|
20
|
100
|
mW
|
46.43453
|
44
|
W
|
20
|
100
|
mW
|
46
|
39.81072
|
W
|
|
21.98657
|
158
|
mW
|
47.63428
|
58
|
W
|
22
|
158.4893
|
mW
|
48
|
63.09573
|
W
|
|
23.9794
|
250
|
mW
|
50
|
100
|
W
|
24
|
251.1886
|
mW
|
50
|
100
|
W
|
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