ESI VideoBridge 2150, Service Manual

Page: 167 / 332

T h e s e v o l t a g e s a r e s e r i a l l y p r o c e s s e d b y t h e A / D c o n v e r t e r w i t h
r e s i s ta n c e ( R ) a n d r e a c t a n c e ( X ) , or c ondu c t a n ce ( G ) a n d s u s c e p t a n c e
( B ) , a s c ompu t e d by t he 2 8 0 C PU .
G
unknown
H I GH I M PE DA N C E
VO V2 + V1 V3
(Val2 + (V 1)2
R standard
R standard
R unknown
X
unknown
L OW I M PE D A N CE
VO V2 + V 1 V3
R
)2
standard
(V2 +
x
R
2
2
standard
(V 2)
+
(V
3)
A l l o t h e r i mpeda n c e pa rame t e r s a re c ompu t e d u s i n g t h e r e su l t s o f
t he s e mea s u r e me n t s , t h e t e s t f requen cy , a nd t h e f o rmu l a s i n F i g u r e
3 - 2 .
T h e c a l c u l a t e d m e a s u r e m e n t i n f o r m a t i o n i s d i sp l a y e d o n t h e C R T
s c r e e n .
3 - 3
e l s l i 2 1 5 0 /2 1 6 0 5 / 8 5