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A
A P P E N D I X
Decibel to Percentage Conversion
Defined as 10x the logarithm (base 10) of the ratio of two power levels. Useful for
expressing relative measurements:
The FPM-8200 makes these relative measurements convenient. Just press
dBm/W and dB buttons together to set a reference at the start of your test.
Thereafter the front panel shows changes in dB relative to that reference value
(Power
Decibel (dB) is a convenient way to express large ratios. For example, +20 dB
=100:1, and -20 dB =1%. For smaller ratios, here is a table relating dB and %.
Remember that 0 dB =100%
Table A.1 Decibel to Percentage
10.0
76
FPM-8200
dB = 10 log
).
2
dB =
1000%
9.5
dB =
891%
9.0
dB =
794%
8.5
dB =
708%
8.0
dB =
631%
7.5
dB =
562%
7.0
dB =
501%
6.5
dB =
447%
6.0
dB =
398%
5.5
dB =
355%
5.0
dB =
316%
4.5
dB =
282%
4.0
dB =
251%
3.5
dB =
224%
3.0
dB =
200%
2.5
dB =
178%
2.0
dB =
158%
1.5
dB =
141%
1.0
dB =
126%
0.5
dB =
112%
Power
1
Power
2
−0.5
dB =
−1.0
dB =
−1.5
dB =
−2.0
dB =
−2.5
dB =
−3.0
dB =
−3.5
dB =
−4.0
dB =
−4.5
dB =
−5.0
dB =
−5.5
dB =
−6.0
dB =
−6.5
dB =
−7.0
dB =
−7.5
dB =
−8.0
dB =
−8.5
dB =
−9.0
dB =
−9.5
dB =
−10.0
dB =
89%
79%
71%
63%
56%
50%
45%
40%
35%
32%
28%
25%
22%
20%
18%
16%
14%
13%
11%
10%
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