ESI VideoBridge 2150, Service Manual

Page: 95 / 332

To f i nd t he span o f c a pa c i ta n ce , i nd u c ta n c e , o r o t h e r me a s ureme n t
pa rame te r s f o r a pa r t i c u l a r impe d a n c e r a n g e ( s hown i n Ta b l e 2 - 6 ) a t a
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pa r t i cu l a r frequ e n c y u s e Ta b l e 2 - 7 a s f o l l ows :
1 . F i nd t h e i mpeda n c e
( Z )
a l ong t h e l e f t ma rg i n o f Ta b l e 2 - 7 .
2 . F i nd t h e ope ra t i ng f requency ( H z ) a t t he bo t t om o f Ta b l e 2 - 7 .
3 . F i n d t h e i n te r s e c t i on o f t he ho r i z on ta l i mpeda n c e l i ne a n d t h e
v e r t i ca l f r equ e n c y l i ne .
4 . F i nd t h e c l o s e s t d i a g o na l l i ne t o t h e i n te r se c t i on .
5 . Move d own t he d i a g o na l l i n e t o t h e r i g h t o r bo t tom m a r g i n t o f i nd
t h e c o rre spond i ng c a pa c i ta n c e va l ue . M o v e up t h e d i a g ona l l i n e to
t h e r i g h t o r t o p m a rg i n t o f i nd i nd u c t a n ce . R e s i s ta n c e , c o n d u c ­
t a n c e , a dm i t t a n c e , s u s c e p ta n ce , a n d re a c ta n c e c a n b e found i n t h e
t w o a d j a c e n t c o l um n s o f the l e f t ma rg i n .
2 . 5 . 3 . 1 H o l d
t h e s a m e
de s c r i be d
v a l u e w h e r e
i n S e c t i on
s p e e d i s a
2 . 5 . 3 c a n be
W h e n t e s t i n g m a n y c o m p o n e n t s o f
pre requ i s i t e , t h e pre-me a s u re m e n t
e l i m i na te d by u s i ng ra n g e H OL D .
( T h e r a n g e f i n d i ng mea s u re m e n t ta ke s
a m i n i m um o f 6 0 m s . Due t o i n c r e a s e d i n te g ra t i on t i me , ra n g e f i nd i n g
mea su reme n ts made a t f r e q u e n c i e s be l ow 5 00 H z w i l l t a k e l o ng e r . )
RANGE HOL D c a n be s e t i n e i t h e r o f two ways :
1 . I n t h e Ma n ua l - H o l d Mode , de s c r i be d be l ow ,
S T E P 1 .
S T E P 2 .
Conn e c t a compone n t t o t he t e s t l ea d s or f i x tu r e .
A l l ow one me a s u reme n t t o be ma de , t he n pus h t h e H O L D
bu t t on .
2 - 5 6
e l s l i 2 1 5 0 / 2 1 6 0 5 /8 5