76
FPM-8200
A P P E N D I X
A
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
2
).
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
dB =
1000%
−0.5
dB =
89%
9.5
dB =
891%
−1.0
dB =
79%
9.0
dB =
794%
−1.5
dB =
71%
8.5
dB =
708%
−2.0
dB =
63%
8.0
dB =
631%
−2.5
dB =
56%
7.5
dB =
562%
−3.0
dB =
50%
7.0
dB =
501%
−3.5
dB =
45%
6.5
dB =
447%
−4.0
dB =
40%
6.0
dB =
398%
−4.5
dB =
35%
5.5
dB =
355%
−5.0
dB =
32%
5.0
dB =
316%
−5.5
dB =
28%
4.5
dB =
282%
−6.0
dB =
25%
4.0
dB =
251%
−6.5
dB =
22%
3.5
dB =
224%
−7.0
dB =
20%
3.0
dB =
200%
−7.5
dB =
18%
2.5
dB =
178%
−8.0
dB =
16%
2.0
dB =
158%
−8.5
dB =
14%
1.5
dB =
141%
−9.0
dB =
13%
1.0
dB =
126%
−9.5
dB =
11%
0.5
dB =
112%
−10.0
dB =
10%
Power
1
Power
2
dB = 10 log
Содержание FPM-8200
Страница 2: ......
Страница 8: ...L I S T O F FIG U R E S vi FPM 8200...
Страница 10: ...L I S T O F TA B L E S viii FPM 8200...
Страница 16: ...WA R R A N T Y xiv FPM 8200...
Страница 36: ...FR O NT PA N E L O P E R A T I O N Operating Guidelines 20 FPM 8200 C H A P T E R 2...
Страница 90: ...TR O U B L E S H OO T I N G A N D M A I N T E N A N C E Error Messages 74 FPM 8200 C H A P T E R 5...
Страница 96: ...80 FPM 8200 A P P E N D I X A...
