T O D I S C O N N E C T T H E O U T P U T U S I N G A N E X T E R N A L R E L A; I N S T A L L A T I O N P R O C E D U R - Agilent Technologies E3633A Service Manual

Chapter 5 Service
To Disconnect the Output Using an External Relay
To Disconnect the Output Using an External Relay
W h e n t h e o u t p u t o f t h e p o w e r s u p p l y i s t u r n e d o f f , i t i s i m p l e m e n t e d b y s e t t i n g
t h e o u t p u t t o 0 v o l t s a n d 0 . 0 2 a m p s . T h i s g i v e s a z e r o o u t p u t v o l t a g e w i t h o u t
a c t u a l l y d i s c o n n e c t i n g t h e o u t p u t . T o d i s c o n n e c t t h e o u t p u t , a n e x t e r n a l r e l a y
m u s t b e c o n n e c t e d b e t w e e n t h e o u t p u t a n d t h e l o a d . A T T L s i g n a l o f e i t h e r l o w
t r u e o r h i g h t r u e i s p r o v i d e d t o c o n t r o l a n e x t e r n a l r e l a y . T h i s s i g n a l c a n o n l y
b e c o n t r o l l e d w i t h t h e r e m o t e c o m m a n d
o u t p u t i s a v a i l a b l e o n t h e R S - 2 3 2 c o n n e c t o r p i n 1 a n d p i n 9 .
W h e n t h e
( 4 . 5 V ) a n d p i n 9 i s l o w ( 0 . 5 V ) . T h e l e v e l s a r e r e v e r s e d w h e n t h e
OUTPut:RELay
N o t e
TTL output of pin 1 or pin 9 of the RS-232 connector is available only after installing
two jumpers inside the power supply. See below for more information.
N o t e Do not use the RS-232 interface if you have configured the power supply to output
relay control signals. Internal components on the RS-232 circuitry may be damaged.
Installation Procedure
T h e a s s e m b l y d r a w i n g s a n d s c h e m a t i c s a r e l o c a t e d i n c h a p t e r 8 , ' ' S c h e m a t i c s ' ' .
1 R e m o v e t h e f r o n t a n d r e a r b u m p e r s a n d t a k e o f f t h e c o v e r ( S e e t h e m e c h a n i c a l
d i s a s s e m b l y d r a w i n g o n p a g e 1 2 7 ) .
2 I n s t a l l J P 3 a n d J P 4 l o c a t e d a d j a c e n t t o t h e c o n n e c t o r P 5 ( T h e J P 3 a n d J P 4 a r e
o u t l i n e d w i t h a c i r c l e i n t h e c o m p o n e n t l o c a t o r d i a g r a m o n p a g e 1 2 8 ) .
A b a r e w i r e m a y b e u s e d .
3 R e a s s e m b l e t h e p o w e r s u p p l y .
OUTPut:RELay
s t a t e i s ' ' O N ' ' , t h e T T L o u t p u t o f p i n 1 i s h i g h
s t a t e i s ' ' O F F ' ' .
OUTPut:RELay
{ O F F | O N } . T h e T T L
5
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