Kenwood PD18-20, Instruction Manual

Page: 16 / 28

H O I ® .
T h e output v o l t a g e is determined w i t h R
2
and Vref a s g i v e n
a b o v e . T h e output v o l t a g e is 0 V if R
2
is infinite (open). S e t
Vref w i t h t h e v o l t a g e control provided on t h e panel. T o fix it or
s e t it e x t e r n a l l y , c o n n e c t a 1 0 k o h m resistor w h i c h h a s a
good t e m p e r a t u r e c h a r a c t e r i s t i c a c r o s s © and ® a c c o r d i n g
to " C o n t r o l b y r e s i s t a n c e ( I ) " . T h e v o l t a g e control of t h e
panel is n o w i n e f f e c t i v e .
N o t e :
B e s u r e to a d j u s t t h e output v o l t a g e at O U T P U T O N m o d e . In
O U T P U T O F F or V / i C H E C K m o d e , t h e r e is a slight error in
m e t e r reading.
C o n t r o l b y e x t e r n a l v o l t a g e
It is p o s s i b l e t o output v o l t a g e w h i c h is proportional to
v o l t a g e .
1) T u r n off p o w e r .
2 ) R e m o v e t h e short bar © - © a n d c o n n e c t external voltage
V
t
a c r o s s ® a n d © a s s h o w n F i g . 9 . B e v e r y careful about
t h e polarity.
Two-core shield cable
•Vi
F i g . 9
Note:
T h e external signal voltage s h o u l d be 0 - 1 0 V . T h e input im-
p e d a n c e a c r o s s ® and ® is approximately 1 0 k o h m s . U s e a
t w o - c o r e shield c a b l e and c o n n e c t t h e shield line to © .
V
0
(VI
: Output voltage
Vi IV]:
External signal voltage
Vm,
x
[VI:
Maximum rated output voltage.
REMOTE CONTROL OF CONSTANT CURRENT
(Resistance, voltage)
Refer to the " P R E C A U T I O N S W H E N U S I N G R E M O T E C O N T R O L "
under " R E M O T E C O N T R O L O F C O N S T A N T - V O L T A G E "
C o n t r o l b y r e s i s t a n c e
C o n t r o l of c o n s t a n t - c u r r e n t is p o s s i b l e in proportion w i t h
r e s i s t a n c e .
1) T u r n off p o w e r .
2) R e m o v e t h e s h o r t bar ® - ® .
3) C o n n e c t variable r e s i s t o r R 3 ( 1 0 k o h m s ) a c r o s s © a n d ®
a s s h o w n F i g . 1 0 .
F i g . 1 0
Two-core
shield cable
16
1 0
( O s V ^ I O V )
R
3