Specifications Of Inputs And Outputs - Philips PM2517E Service Manual

3.4.6.2. Specifications of inputs and outputs
I
I
I
l
l
l
l
l
l
l
l
l
l
l
l
I
2
8
I
1 0
1 1
5 5
V s s ( - 8 , 5 V )
A Z c
^ Z c
Description
R a n g e b , c o n v e r s i o n
resrstor
V o l t a g e i n p u t I
R a n g e a , c o n v e r s i o n
resistor
S U P P L Y
Auto Zero
D c c o u p l i n g c a p a c i t o r
3
5
6
7
Between inputs 1 and 2 the conversion resistor b is connected.
T h e r e s i s t o r d e t e r m i n e s t h e b a s i c c u r r e n t o f t h e V ' l c o n v e r t o r R b
i s R 3 0 8 a n d R 3 1 6 i n t h e P l \ 4 2 5 1 7
R b i s s e l e c t e d d e p e n d e n t t o t h e c o d e o f S i n a n d S o .
I n p u r o l t h e V t o I c o n v e r t o r r n t h e O O 0 0 6 1 .
Between input 4 and 16 the conversion resistor a is connected.
T h e r e s i s t o r d e t e r m i n e s t h e b a s i c c u r r e n t o f t h e V t o I c o n v e r t o r .
R a i s R 3 0 7 i n t h e P l V l 2 5 1 7
R a i s s e l e c t e d d e p e n d e n t t o t h e c o d e o f S i n a n d S o .
N e g a t i v e s u p p l y v o l t a g e - 8 . 5 V
T h e a u t o z e r o d e c o u p l i n g c a p a c i t o r C i s a l t e r n a t r n g c h a r g e d a n d
d i s c h a r g e d . W h e n n o D C o f f s e t i s p r e s e n t , t h e v o l t a g e a c r o s s t h e
c a p a c i t o r i s z e r o . A D C o f f s e t c a u s i n g a v o l t a g e a c r o s s C , i s
c o m p e n s a t e d s o n o i n f l u e n c e i s s e e n u p o n t h e o u t p u t s i g n a l .
S u p p l y z e r o . ü
P r o t e c t i o n i n p u t .
Output current of the Rlvls convertor.
T h e c u r r e n t f l o w i n g t h r o u g h a k n o w n r e s i s t o r g i v e s t h e R I V I S
v o l t a g e o f t h e u n k n o w n i n p L r t v o l t a g e .
P o s i t i v e s u p p t v 8 , 5 V .
B y m e a n s o f t h e S i n a n d S o a s e l e c t i o n c a n b e m a d e R a o r R b ,
w h i c h d e t e r m i n e t h e i o p u t s e n s i t i v i t y o f t h e A D / D C c o n v .
Note: above mentioned table is valid for PM 2517.
I n p u t o f t h e V t o I c o n v e r t o r i n t h e O O 0 0 6 1 .
Between inputs 4 and l6 the conversion resistor a is connected.
The resistor determines the basic current of the V to I convertor
R a i s R 3 0 7 i n t h e P l v l 2 5 1 7 .
Ra is selected dependent to the code of Sin and So.
G N D
P R O T
C r m s
I o u r
vdd (+.8,5 v)
S i n
V i n 2
R a
G R O U N D
P R O T E C T I O N
R lvlS äveraging
capacitor
C u r r e n t o u t p u t
S U P P L Y ;
R a n g e s e l e c t i n g
i n p u t
R a n g e s e l e c t i n g
reference input
V o l t a g e i n p u t 2 ;
R a n g e a , c o n v e r s i o n
resistor
l .
l
I
I
.l
I
.l
l
l
l 5
S i n S o I R a R b I R a n g e
1V.'r00v 10.1 v
1 0 v , 1 0 0 0 v l r v