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HP 5363B Operating And Service Manual page 155

Time interval probes
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M o d e l 5 3 6 3 6
S e r v i c e
A6/A7 T I M E I NT E R VAL P R O B E S
T h e A6 a n d A 7 Probe Asse m b l i e s , a r e w i t h t h e e x c e p t i o n of c h a n n e l c o l o r n n g s , i d e n t i c a l , s o
o n l y o n e w i l l b e d e sc ri b ed
a m p l i f i e rs ; U 1
associated C i rc u i t r y , a r e t h e c u rrent s o u rces for t h e d i fferential a m p l i f iers. A s i g n a l o n t h e
p r o b e t i P
routed t h ro u g h i n p u t c o m pe n s a t i o n n e t w o r k C 1 a n d R 2 to i n p u t g a t e s
I S
b o t h d i f f e r e n t i a l a m p l i f i e rs S t o p a n d S t a rt d c reference v o l t a g e l e v e l s a r e fed t h r o u g h R 3 a n d
R4 to t h e i r respective i n p u t gates { p i n 2 1 . W h e n t h e i n p u t e x c e e d s t h e reference l e ve l , t h e
d i fferential a m p l i f i e r w i l l
M o t h e rb o a r d . Each p r o b e c o n t a i n s b o t h a sta rt a n d s t o p c o n ve r t e r . T h e s t a t e m a c h i n e selects
o n e start a n d o n e stop b y t u rn i n g o n or t u r n i n g off the -1 5 V p o w e r to t h e a p propriate c u rr e n t
sources.
8 - 6 8
U 1 a nd U2 a r e d u a l J F ETs w h i c h a re ess e n t i a l l y d i ffere n ti a l
for t h e START s i g n a l a n d U2 for t h e STOP. 0 1 a n d 0 2 , a l o n g w i t h t h e i r
I S
c h a n g e
states,
provi d i n g
c o m p l e m e n t a ry o u t p u ts
p i n s 5 , 6 1 o f
I
t o
t h e A 1

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