ESI VideoBridge 2150, Руководство по обслуживанию

Страница: 81 / 332

T o c o n v e r t a s e r i e s e q u i v a l e n t c i r c u i t m e a s u r e m e n t t o t h a t o f a
pa ra l l e l e q u i va l e n t c i r c u i t use t he f o r mu l a s g i ve n i n F i g u r e 2 - 1 0
• •
T h e s e f o rmu l a s c ons i de r t h e e f f e c t s o f d i s s i pa t i on f a c t o r ( D ) w i t h t h e
mea s u re d v a l u e .
( D i ss i pa t i on f a c tor ( D ) i s a lw a y s equa 1 f o r bo t h
s e r i e s a n d pa ra l le l equ i va l e n t c i r cu i t s a t a g i ve n f re q u e n cy . )
C I R C U I T M OD E
D I S S I P A T I O N F A C T O R
C O N V E R S I O N T O OT H E R M O D E S
C
L
W h e r e :
L
R
C
f
cp
Cs
=
(
1
+
D2 ) cp
-r!J-
D
=
1 1
=
-
2" fCpRp
Q
Rs
=
D2
Rp
Rp
1
+
D2
Cp
=
1
Cs
Cs Rs
1
+
D2
-f�
D =
2".fCsRs
1
=
Q
1
+
D2
Rp
= D2
Rs
Ls
=
1
Lp
Lp
1
+
D2
-r:::r
2 ". fLp
1
D
=
=
Rp Q
D2
Rp Rs
=
Rp
1
+
D2
Ls Rs
Lp
=
( 1
+
D2 )
Ls
Rs 1
�
D =
=
1
+
D2
2"fLs
Q
Rp
=
Rs
D2
F i g u re 2 - 1 0 .
S e r i e s and P a ra l le l Equ i va l e n t C i rc u i t Modes
=
=
=
=
I n d u c t a n c e
R e s i s t a n ce
C a pa c i t a n c e
t e s t f requency
Xs
Q =
Rs
Q
=
Qua l i ty f a c to r
X
=
Rea c ta n c e
o
=
D i s s i p a t i o n f a c t o r
D = �
Xs
Xs
=
2rr fCs
2 - 4 2
e l s l i 2 1 5 0 / 2 1 6 0 5 /8 5
•
•