USING THE dB CONVERSION CHART
n..
lcoomponylnl
el\I.I1
Illow.
dB
..
tioolo
1M>
MSIly
computed
U$lnl
the
..
tio
of
Iwo >olta,...
0'
pow,.... The
fDmlulll<
for
dB
"Uoolre:
'.
For two
Ii
..
n .-011.11":
dB.
20
1.0(10
...;;..._
"
"
For two
Ilftn
pow,...: dB -
10
LollO
-'f-
"
The cllarl eliminates 1.0( calClltatiol1l by limply
lindin.
the
IIIUO
of
Ibe
hro
Ill
....
n numbell (ellber
.oltapo
or
1""""1'1)
on
the
Iown
ocaIe
of
thl
JIlph
Ind
refnrinl
to
thllef\
numbo"
If
the
..
tlo
II for
po.e"
or
tbe
riChI
If the
..
110
II
for
volta,".
To lind the
..
Uo,
limply dlri<la the latger
of
Ibe two
Ii"""
num·
ben
by tbe omaIlcr
usinll
calculator, slide rul.,
or
lonlband
di
....
lon.
It
the lop number
In
the ratio
II
the tarcer,
the
,,"uili.
read
..
+dB,
Ind
If
th.
bottom
II
tile
ta
....
r, the ,
..
ult
is
-dB.
EXAMPLE
I:
Find
11M>
dB
..
tlo
of
10,000 uV
and
250 uV.
SOLUTION: Ralio _ lQllOIl. DM<le
oman"
numlM>r
into
""
tali"" -
4Q.
Find
40
on
r:Itut
end
10000ta
numller
on
bollom
pid
for
volll."
..
tio.
Ruult
II
32
dB.
SIn.., 1be targer number
II
on
lOp,
,,"ult
10
+32
dB.
EXAMPLE
2:
Find the
dB
rallo
of
.69
Willi
Ind
2.6 Willi.
SOLUTION: Ralio _
~
Dhl<le
.....
lIer
numlM>r
Inlo
Ill.
2.6 .
to. number - 3.8. Find 3.8
on
dian
Ind
IooIte
numlM>r
on
bottom
pid
tor power
1IIt10.
R_It
10
~.8.
SInor
th.
II
......
number
is
on
the
bottom,
,,"ult
is
~.8.
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w
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.w
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~no
'.
.
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.
~
.~
- -
---
-;:-
I-l
,-~
~
I
:l=l---r+-t;
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'00
RATIO ' .....
" .
'..
•
~
, .
,
•
•
,
w
0
<
•
•
"
0
>
•
•
•
"ro,
·ll
:,
,
,
"
!it.
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