HP 5363B Operating And Service Manual page 143

M o d e l 5 3 5 3 8
Servic e
A3 CA L I B RATE A S S E M B LY
T h e C a l i b rate Asse m b l y c o n t a i n s t h e f r o n t p a n e l s w i t c h e s a n d i n d i c a t o r l i g h ts, as we l l as t h e
T i m e Zero p u l se c i rc u i t r y . S W i t c h S 1
Z E R O/ L EV E L s w i t c h a n d S 3 I S t h e P U L L T O A D D 1 0 .0 n s s w i tc h . W h e n s w i t c h S 2 i s i n t h e
T I M E Z E R O posi t i o n , t ra n s i s t o r Q 1 I S t u r n e d o n , e n a b l i n g t r a n s i s t o r s Q2, Q 3 , a n d Q 4 . C l o c k
p u l s e s o n J 3 p i n 1 2 a re fed t h ro u g h Q4 a n d a re c o n verted I n to h i g h -speed p u l s e s w h i c h a re
o u t p u t on f ront p a n e l J a c k s J 1 a n d J 2 . W h e n s W i t c h S2
n e t w o r k i s disabled and f r o n t panel Jacks are g ro u n d e d . R 1 8 c o n t r o l s t h e d e l a y o n S t o p
C h a n n e l c om parator A 1 U 1 9 A b y v a r y i n g t h e v o l t a g e at A1 C R 1 5 . S3, w h e n p u l led o u t , t u r n s o n
A 1 Q 5 , e n a b l i n g re l a y A1 K 1
o u t p u t .
'S2 IS a reversible action loggle sWitch
8 - 5 2
I S
t h e f r o n t p a n e l L O C A L p u s h b u t t o n , S2'
T h i s c o n nects 1 0 n s f i xed d e l a y l i n e D L 1 t o t h e S t o p C h a n n e l
IS
in the L E V E L p o s i t i o n , t h e p u lse
I S
t h e T I M E
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