1 00
V1
w
""
w
60
Cl.
:E
«
:::;
-'
�
Ta b l e
2-5 .
Te s t Level v s I mpeda n c e ( typ i ca l a t
1 k H z )
�
<
r
-i
Vl
N
(3
1 O � (l
l OO � (l
I m O
1 0 m O
l OO m O
1 0
1 0 0
1 00 0
I kO
1 0 k(l
1 00 k (l
IMO
1 0 MO
�
CONSTANT CURRENT ( Ie)
Ie OR Ve
CONSTANT VOLTAGE ( Ve)
-i
m
Vl
-i
r
m
<
m
r-
T a b l e 2 - 5 s h ow s t y p i c a l t e s t l e v e l l i m i t a t i o n s c o m p a r e d t o t h e
i m p e d a n c e o f t h e c om p o n e n t u n d e r t e s t a t 1 k H z . T h e s h a d e d a r e a s
i n d i ca t e t e s t s i g n a l l e ve l s n o t a va i l a b l e f o r a g i ve n i mpe d a n c e .
Te s t c u r re n t s can be prog r a mmed b e tw e e n O . l mA a n d 1 00 mA .
F or u n k n own
i mp e da n c e s be twee n 0 a n d 2 0 k i l o h m s , s e t t he te s t c u r re n t d i r e c t l y .
F o r unk n own i mpe d a n c e s ove r 2 0 k i l o hms , t he t e s t c u r re n t i s de t e r m i n e d
b y d i v i d i ng t h e v o l t a g e l e v e l b y t h e u n k n own i mpe d a n ce .
Fo r be s t m e a suremen t re su l t s , s e l e c t a te s t s i g na l l e ve l t h a t w i l l
prov i de t h e be s t s i g n a l - to- n o i se ra t i o .
H i g h te s t s i g na l l e ve l s a re
u s e d f o r g e n e ra l c ompone n t t e s t i ng ( capa c i t o r s , re s i s t o r s , a n d c e r ta i n
i n d u c t o r s ) . L o w t e s t s i g n a l l e v e l s a r e u s e d f o r t e s t i n g d e v i c e s
requ i r i ng
l ow
ope ra t i n g- s i gna l
l e ve l s
( sem i c on d u c t o r
d e v i c e s ,
i n d u c t or s , a n d n o n- l i ne a r i mp e d a n c e d e v i c e s ) .
U n d e r c e r t a i n c o n d i t i o n s a t e s t l e v e l c a n b e p r o g r a m m e d t h a t t h e
V i d e o B r i dg e c a n n o t supp l y . T h i s i s d u e t o a m i s ma t c h o c cu r r i n g w h e n a
l ow i m p e d a n c e pa r t i s mea su red w i t h a c o n s t a n t vol t a g e or w h e n a h i g h
i mpeda n c e pa r t i s mea s u r e d w i t h c o n s ta n t c u r ren t . W h e n t h i s ha ppe n s ,
t h e i n s t r um e n t w i l l s uppl y a
t e s t s i g na l
l e s s t ha n
prog ram m e d a n d d i sp l a y o n e o f t h e f o l l ow i ng e r r o r m e s s a ge s :
2 - 5 1
e
l
s
l
i
2 1 5 0 / 2 1 60 5 /8 5
t h e l e ve l
Summary of Contents for VideoBridge 2150
Page 24: ...BLANK 1 6 e l s l i 2 1 50 2 1 60 5 8 5...
Page 230: ...R54 R 1 9 R23 6 TP8 o O NC N N N N a a a a a F i gure 5 5...
Page 252: ...A t S E C T I ON A A 4 5 0 0 m m 5 rY1 m A...
Page 307: ...Figure 8 1 General Handler Interface Circuit Assembly P N 47895 B 2 e s i 2150 2160 5 85...
Page 330: ...F i gure 8...