Table of Contents
Advertisement
o p t i o n f o r t h e DRC-7C/70C i n s t r u m e n t s i s t h e c a p a b i l i t y t o remote program
t h e t e m p e r a t u r e s e t p o i n t v i a a BCD s i g n a l from s o u r c e s such as a computer o r
d i g i t a l f u n c t i o n g e n e r a t o r .
The t h i r d o p t i o n i s e i t h e r a two p o s i t i o n , f i v e
p o s i t i o n , o r t e n p o s i t i o n s w i t c h (DRC-SW-
2 , 5 , o r
10)
f o r m u l t i p l e s e n s o r
r e a d o u t s .
The DRC-70 h a s t h e s w i t c h mounted i n t e r n a l l y w h i l e t h e DRC-7C/70C
h a s t h e s w i t c h mounted i n an e x t e r n a l box.
The f o u r t h o p t i o n i s a custom
c u t P R O M (Programmable Read Only Memory) which c o r r e s p o n d s t o t h e c a l i b r a t i o n
c u r v e of t h e customers DT-500 s e r i e s s e n s o r .
A combination of c a l i b r a t i o n and
custom c u t P R O M w i l l i n c r e a s e i n s t r u m e n t a c c u r a c y t o 0 . 1 k e l v i n .
P l e a s e n o t e
t h a t any s e n s o r may b e used w i t h t h i s o p t i o n , i . e . , t h e customer i s n o t
r e s t r i c t e d t o t h e DRC series s e n s o r s .
1 . 3
D e s c r i p t i o n - S p e c i f i c
The f o l l o w i n g p r o v i d e s a d e s c r i p t i o n f o r t h e DRC-70 and DRC-7C/70C
i n s t r u m e n t s .
The DRC-70 and DRC-70C p r o v i d e d i r e c t t e m p e r a t u r e r e a d o u t i n k e l v i n
d e g r e e s w i t h 0.1 d e g r e e r e s o l u t i o n .
The DRC-70C c o n t r o l s i n a p r o p e r l y
d e s i g n e d system t o 0 . 1 k e l v i n .
The DRC-7C h a s 1 d e g r e e r e s o l u t i o n and c o n t r o l s
t o 1 k e l v i n .
Conformity t o a s t a n d a r d DRC c u r v e i s b e t t e r t h a n 0 . 5 k e l v i n
o v e r t h e t e m p e r a t u r e r a n g e from 4.0 t o 380 K .
The DRC-7/70 series i s d e s i g n e d around a n F8 m i c r o p r o c e s s o r u s i n g a
3850/3853 c o n f i g u r a t i o n and a s s o c i a t e d s u p p o r t c i r c u i t s .
The DRC c u r v e i s
s t o r e d i n a PROM which can h a n d l e up t o 32 b r e a k p o i n t s .
The d a t a c o n s i s t s
of a t a b l e of t e m p e r a t u r e , v o l t a g e and s l o p e between each b r e a k p o i n t .
These
s t r a i g h t l i n e segments g e n e r a t e t h e DRC c u r v e t o a n accuracy of b e t t e r t h a n
0 . 1 k e l v i n o v e r t h e e n t i r e t e m p e r a t u r e r a n g e ( 4 . 0
-
400
K ) .
S e n s o r s a r e
s e l e c t e d t o conform t o t h i s c u r v e t o a n a c c u r a c y o f b e t t e r t h a n 0.5 K o v e r t h e
e n t i r e r a n g e .
1 . 3 . 1
General S p e c i f i c a t i o n s
The f o l l o w i n g s p e c i f i c a t i o n s f o r t h e DRC-7/70 s e r i e s a r e a p p l i c a b l e
when used w i t h t h e s t a n d a r d DT-500-DRC
o r DT-500CU-DRC-36
t e m p e r a t u r e s e n s o r s .
General
:
Temperature Range:
1 t o 4 0 0 K (Accuracy n o t g u a r a n t e e d below 4 . 0 K)
Sensor:
S i l i c o n Diode (Model DT-500-DRC
o r DT-500CU-DRC-36)
Sensor I n p u t :
4
t e r m i n a l c o n n e c t i o n , c o n s t a n t c u r r e n t e x c i t a t i o n
Sensor E x c i t a t i o n :
C o n s t a n t c u r r e n t 1 0 microamperes
C u r r e n t R e g u l a t i o n :
±0.01%
I n p u t L i n e V o l t a g e :
115
V o r 230 V , 50
-
60 Hz, s w i t c h s e l e c t a b l e
O p e r a t i n g Environment:
1 0
-
45°C
C i r c u i t Design:
I n t e g r a t e d c i r c u i t s , m i c r o p r o c e s s o r c o n t r o l l e d
Advertisement
Table of Contents
